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Commit 638fa95e authored by Sergei Petrunia's avatar Sergei Petrunia
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Post-merge fixes for rocksdb.group_min_max test 

- Fix the LooseScan code to support storage engines that return
  HA_ERR_END_OF_FILE if the index scan goes out of provided range
  bounds
- Add a DBUG_EXECUTE_IF("force_group_by",...) to allow a test to
  force a LooseScan
- Adjust rocksdb.group_min_max test not to use features not present
  in MariaDB 10.2 (e.g. optimizer_trace.  In MariaDB 10.4 it's present
  but it doesn't meet the  assumptions that the test makes about it
- Adjust the test result file:
  = MariaDB doesn't support "Enhanced Loose Scan" that FB/MySQL has
  = MariaDB has different cost calculations.
parent 731ef751
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Showing with 395 additions and 360 deletions
sql/opt_range.cc
View file @ 638fa95e
......@@ -2428,6 +2428,7 @@ int SQL_SELECT::test_quick_select(THD *thd, key_map keys_to_use,
KEY_PART *key_parts;
KEY *key_info;
PARAM param;
bool force_group_by = false;
if (check_stack_overrun(thd, 2*STACK_MIN_SIZE + sizeof(PARAM), buff))
DBUG_RETURN(0); // Fatal error flag is set
......@@ -2555,15 +2556,20 @@ int SQL_SELECT::test_quick_select(THD *thd, key_map keys_to_use,
Try to construct a QUICK_GROUP_MIN_MAX_SELECT.
Notice that it can be constructed no matter if there is a range tree.
*/
DBUG_EXECUTE_IF("force_group_by", force_group_by = true; );
group_trp= get_best_group_min_max(&param, tree, best_read_time);
if (group_trp)
{
param.table->quick_condition_rows= MY_MIN(group_trp->records,
head->stat_records());
if (group_trp->read_cost < best_read_time)
if (group_trp->read_cost < best_read_time || force_group_by)
{
best_trp= group_trp;
best_read_time= best_trp->read_cost;
if (force_group_by)
{
goto force_plan;
}
}
}
......@@ -2663,6 +2669,7 @@ int SQL_SELECT::test_quick_select(THD *thd, key_map keys_to_use,
}
}
force_plan:
thd->mem_root= param.old_root;
/* If we got a read plan, create a quick select from it. */
......@@ -11509,14 +11516,29 @@ int QUICK_RANGE_SELECT::get_next_prefix(uint prefix_length,
DBUG_ASSERT(cur_prefix != NULL);
result= file->ha_index_read_map(record, cur_prefix, keypart_map,
HA_READ_AFTER_KEY);
if (result || last_range->max_keypart_map == 0)
if (result || last_range->max_keypart_map == 0) {
/*
Only return if actual failure occurred. For HA_ERR_KEY_NOT_FOUND
or HA_ERR_END_OF_FILE, we just want to continue to reach the next
set of ranges. It is possible for the storage engine to return
HA_ERR_KEY_NOT_FOUND/HA_ERR_END_OF_FILE even when there are more
keys if it respects the end range set by the read_range_first call
below.
*/
if (result != HA_ERR_KEY_NOT_FOUND && result != HA_ERR_END_OF_FILE)
DBUG_RETURN(result);
} else {
/*
For storage engines that don't respect end range, check if we've
moved past the current range.
*/
key_range previous_endpoint;
last_range->make_max_endpoint(&previous_endpoint, prefix_length, keypart_map);
last_range->make_max_endpoint(&previous_endpoint, prefix_length,
keypart_map);
if (file->compare_key(&previous_endpoint) <= 0)
DBUG_RETURN(0);
}
}
uint count= ranges.elements - (uint)(cur_range - (QUICK_RANGE**) ranges.buffer);
if (count == 0)
......
storage/rocksdb/mysql-test/rocksdb/include/group_min_max.inc
View file @ 638fa95e
......@@ -266,6 +266,17 @@ select a1, max(c) from t2 where a1 in ('a','b','d') group by a1,a2,b;
# B) Equalities only over the non-group 'B' attributes
# plans
--echo #
--echo # MariaDB: we dont have the following patch:
--echo #
--echo # commit 60a92a79a3b7fde3c6efe91799e344b977c8e5c3
--echo # Author: Manuel Ung <mung@fb.com>
--echo # Date: Thu Apr 19 23:06:27 2018 -0700
--echo #
--echo # Enhance group-by loose index scan
--echo #
--echo # So the following results are not very meaningful, but are still kept here
explain select a1,a2,b,max(c),min(c) from t1 where (a2 = 'a') and (b = 'b') group by a1;
explain select a1,a2,b,max(c),min(c) from t1 where (a2 = 'a' or a2 = 'b') and (b = 'b') group by a1;
explain select a1,a2,b,max(c),min(c) from t1 where (a2 = 'a') and (b = 'b' or b = 'a') group by a1;
......@@ -730,9 +741,9 @@ explain extended select a1,a2,count(a2) from t1 where (a1 > 'a') group by a1,a2,
explain extended select sum(ord(a1)) from t1 where (a1 > 'a') group by a1,a2,b;
# test multi_range_groupby flag
set optimizer_switch = 'multi_range_groupby=off';
#MariaDB: no support: set optimizer_switch = 'multi_range_groupby=off';
explain select a1,a2,b,max(c),min(c) from t2 where (a2 = 'a') and (b = 'a' or b = 'b') group by a1;
set optimizer_switch = 'default';
#set optimizer_switch = 'default';
explain select a1,a2,b,max(c),min(c) from t2 where (a2 = 'a') and (b = 'a' or b = 'b') group by a1;
......@@ -1361,41 +1372,41 @@ drop table t1;
eval CREATE TABLE t (a INT, b INT, KEY(a,b)) engine=$engine;
INSERT INTO t VALUES (1,1), (2,2), (3,3), (4,4), (1,0), (3,2), (4,5);
ANALYZE TABLE t;
let $DEFAULT_TRACE_MEM_SIZE=1048576; # 1MB
eval set optimizer_trace_max_mem_size=$DEFAULT_TRACE_MEM_SIZE;
set @@session.optimizer_trace='enabled=on';
set end_markers_in_json=on;
# MariaDB: 10.2 doesn't have trace, yet: let $DEFAULT_TRACE_MEM_SIZE=1048576; # 1MB
# eval set optimizer_trace_max_mem_size=$DEFAULT_TRACE_MEM_SIZE;
# set @@session.optimizer_trace='enabled=on';
# set end_markers_in_json=on;
ANALYZE TABLE t;
SELECT a, SUM(DISTINCT a), MIN(b) FROM t GROUP BY a;
EXPLAIN SELECT a, SUM(DISTINCT a), MIN(b) FROM t GROUP BY a;
SELECT TRACE RLIKE 'have_both_agg_distinct_and_min_max' AS OK
FROM INFORMATION_SCHEMA.OPTIMIZER_TRACE;
#SELECT TRACE RLIKE 'have_both_agg_distinct_and_min_max' AS OK
# FROM INFORMATION_SCHEMA.OPTIMIZER_TRACE;
SELECT a, SUM(DISTINCT a), MAX(b) FROM t GROUP BY a;
EXPLAIN SELECT a, SUM(DISTINCT a), MAX(b) FROM t GROUP BY a;
SELECT TRACE RLIKE 'have_both_agg_distinct_and_min_max' AS OK
FROM INFORMATION_SCHEMA.OPTIMIZER_TRACE;
#SELECT TRACE RLIKE 'have_both_agg_distinct_and_min_max' AS OK
# FROM INFORMATION_SCHEMA.OPTIMIZER_TRACE;
SELECT a, MAX(b) FROM t GROUP BY a HAVING SUM(DISTINCT a);
EXPLAIN SELECT a, MAX(b) FROM t GROUP BY a HAVING SUM(DISTINCT a);
SELECT TRACE RLIKE 'have_both_agg_distinct_and_min_max' AS OK
FROM INFORMATION_SCHEMA.OPTIMIZER_TRACE;
#SELECT TRACE RLIKE 'have_both_agg_distinct_and_min_max' AS OK
# FROM INFORMATION_SCHEMA.OPTIMIZER_TRACE;
SELECT SUM(DISTINCT a), MIN(b), MAX(b) FROM t;
EXPLAIN SELECT SUM(DISTINCT a), MIN(b), MAX(b) FROM t;
SELECT TRACE RLIKE 'have_both_agg_distinct_and_min_max' AS OK
FROM INFORMATION_SCHEMA.OPTIMIZER_TRACE;
#SELECT TRACE RLIKE 'have_both_agg_distinct_and_min_max' AS OK
# FROM INFORMATION_SCHEMA.OPTIMIZER_TRACE;
SELECT a, SUM(DISTINCT a), MIN(b), MAX(b) FROM t GROUP BY a;
EXPLAIN SELECT a, SUM(DISTINCT a), MIN(b), MAX(b) FROM t GROUP BY a;
SELECT TRACE RLIKE 'have_both_agg_distinct_and_min_max' AS OK
FROM INFORMATION_SCHEMA.OPTIMIZER_TRACE;
#SELECT TRACE RLIKE 'have_both_agg_distinct_and_min_max' AS OK
# FROM INFORMATION_SCHEMA.OPTIMIZER_TRACE;
SET optimizer_trace_max_mem_size=DEFAULT;
SET optimizer_trace=DEFAULT;
SET end_markers_in_json=DEFAULT;
#SET optimizer_trace_max_mem_size=DEFAULT;
#SET optimizer_trace=DEFAULT;
#SET end_markers_in_json=DEFAULT;
DROP TABLE t;
......
storage/rocksdb/mysql-test/rocksdb/r/group_min_max.result
View file @ 638fa95e
set global debug="+d,force_group_by";
set @debug_tmp= @@debug_dbug;
set global debug_dbug="+d,force_group_by";
drop table if exists t1;
create table t1 (
a1 char(64), a2 char(64), b char(16), c char(16) not null, d char(16), dummy char(248) default ' '
......@@ -134,34 +135,34 @@ Table Op Msg_type Msg_text
test.t3 analyze status OK
explain select a1, min(a2) from t1 group by a1;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 range idx_t1_0,idx_t1_1,idx_t1_2 idx_t1_1 130 NULL 126 Using index for group-by
1 SIMPLE t1 range NULL idx_t1_1 130 NULL 63 Using index for group-by
explain select a1, max(a2) from t1 group by a1;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 range idx_t1_0,idx_t1_1,idx_t1_2 idx_t1_1 65 NULL 126 Using index for group-by
1 SIMPLE t1 range NULL idx_t1_1 65 NULL 63 Using index for group-by
explain select a1, min(a2), max(a2) from t1 group by a1;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 range idx_t1_0,idx_t1_1,idx_t1_2 idx_t1_1 130 NULL 126 Using index for group-by
1 SIMPLE t1 range NULL idx_t1_1 130 NULL 63 Using index for group-by
explain select a1, a2, b, min(c), max(c) from t1 group by a1,a2,b;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 range idx_t1_1,idx_t1_2 idx_t1_1 147 NULL 501 Using index for group-by
1 SIMPLE t1 range NULL idx_t1_1 147 NULL 251 Using index for group-by
explain select a1,a2,b,max(c),min(c) from t1 group by a1,a2,b;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 range idx_t1_1,idx_t1_2 idx_t1_1 147 NULL 501 Using index for group-by
1 SIMPLE t1 range NULL idx_t1_1 147 NULL 251 Using index for group-by
explain select a1,a2,b,max(c),min(c) from t2 group by a1,a2,b;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t2 range idx_t2_1,idx_t2_2 idx_t2_1 # NULL # Using index for group-by
1 SIMPLE t2 range NULL idx_t2_1 # NULL # Using index for group-by
explain select min(a2), a1, max(a2), min(a2), a1 from t1 group by a1;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 range idx_t1_0,idx_t1_1,idx_t1_2 idx_t1_1 130 NULL 126 Using index for group-by
1 SIMPLE t1 range NULL idx_t1_1 130 NULL 63 Using index for group-by
explain select a1, b, min(c), a1, max(c), b, a2, max(c), max(c) from t1 group by a1, a2, b;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 range idx_t1_1,idx_t1_2 idx_t1_1 147 NULL 501 Using index for group-by
1 SIMPLE t1 range NULL idx_t1_1 147 NULL 251 Using index for group-by
explain select min(a2) from t1 group by a1;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 range idx_t1_0,idx_t1_1,idx_t1_2 idx_t1_1 130 NULL 126 Using index for group-by
1 SIMPLE t1 range NULL idx_t1_1 130 NULL 63 Using index for group-by
explain select a2, min(c), max(c) from t1 group by a1,a2,b;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 range idx_t1_1,idx_t1_2 idx_t1_1 147 NULL 501 Using index for group-by
1 SIMPLE t1 range NULL idx_t1_1 147 NULL 251 Using index for group-by
select a1, min(a2) from t1 group by a1;
a1 min(a2)
a a
......@@ -288,37 +289,37 @@ b i421 l421
b m422 p422
explain select a1,a2,b,min(c),max(c) from t1 where a1 < 'd' group by a1,a2,b;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 range idx_t1_0,idx_t1_1,idx_t1_2 idx_t1_1 147 NULL 501 Using where; Using index for group-by
1 SIMPLE t1 range idx_t1_0,idx_t1_1,idx_t1_2 idx_t1_1 147 NULL 251 Using where; Using index for group-by
explain select a1,a2,b,min(c),max(c) from t1 where a1 >= 'b' group by a1,a2,b;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 range idx_t1_0,idx_t1_1,idx_t1_2 idx_t1_1 147 NULL 501 Using where; Using index for group-by
1 SIMPLE t1 range idx_t1_0,idx_t1_1,idx_t1_2 idx_t1_1 147 NULL 251 Using where; Using index for group-by
explain select a1,a2,b, max(c) from t1 where a1 >= 'c' or a1 < 'b' group by a1,a2,b;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 range idx_t1_0,idx_t1_1,idx_t1_2 idx_t1_1 147 NULL 1002 Using where; Using index for group-by
1 SIMPLE t1 range idx_t1_0,idx_t1_1,idx_t1_2 idx_t1_1 147 NULL 502 Using where; Using index for group-by
explain select a1, max(c) from t1 where a1 >= 'c' or a1 < 'b' group by a1,a2,b;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 range idx_t1_0,idx_t1_1,idx_t1_2 idx_t1_1 147 NULL 1002 Using where; Using index for group-by
1 SIMPLE t1 range idx_t1_0,idx_t1_1,idx_t1_2 idx_t1_1 147 NULL 502 Using where; Using index for group-by
explain select a1,a2,b,min(c),max(c) from t1 where a1 >= 'c' or a2 < 'b' group by a1,a2,b;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 range idx_t1_0,idx_t1_1,idx_t1_2 idx_t1_1 147 NULL 501 Using where; Using index for group-by
1 SIMPLE t1 range idx_t1_0,idx_t1_1,idx_t1_2 idx_t1_1 147 NULL 251 Using where; Using index for group-by
explain select a1,a2,b, max(c) from t1 where a1 = 'z' or a1 = 'b' or a1 = 'd' group by a1,a2,b;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 range idx_t1_0,idx_t1_1,idx_t1_2 idx_t1_1 147 NULL 1503 Using where; Using index for group-by
1 SIMPLE t1 range idx_t1_0,idx_t1_1,idx_t1_2 idx_t1_1 147 NULL 753 Using where; Using index for group-by
explain select a1,a2,b,min(c),max(c) from t1 where a1 = 'z' or a1 = 'b' or a1 = 'd' group by a1,a2,b;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 range idx_t1_0,idx_t1_1,idx_t1_2 idx_t1_1 147 NULL 1503 Using where; Using index for group-by
1 SIMPLE t1 range idx_t1_0,idx_t1_1,idx_t1_2 idx_t1_1 147 NULL 753 Using where; Using index for group-by
explain select a1,a2,b, max(c) from t1 where (a1 = 'b' or a1 = 'd' or a1 = 'a' or a1 = 'c') and (a2 > 'a') group by a1,a2,b;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 range idx_t1_0,idx_t1_1,idx_t1_2 idx_t1_1 147 NULL 2004 Using where; Using index for group-by
1 SIMPLE t1 range idx_t1_0,idx_t1_1,idx_t1_2 idx_t1_1 147 NULL 1004 Using where; Using index for group-by
explain select a1,a2,b,min(c),max(c) from t1 where (a1 = 'b' or a1 = 'd' or a1 = 'a' or a1 = 'c') and (a2 > 'a') group by a1,a2,b;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 range idx_t1_0,idx_t1_1,idx_t1_2 idx_t1_1 147 NULL 2004 Using where; Using index for group-by
1 SIMPLE t1 range idx_t1_0,idx_t1_1,idx_t1_2 idx_t1_1 147 NULL 1004 Using where; Using index for group-by
explain select a1,min(c),max(c) from t1 where a1 >= 'b' group by a1,a2,b;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 range idx_t1_0,idx_t1_1,idx_t1_2 idx_t1_1 147 NULL 501 Using where; Using index for group-by
1 SIMPLE t1 range idx_t1_0,idx_t1_1,idx_t1_2 idx_t1_1 147 NULL 251 Using where; Using index for group-by
explain select a1, max(c) from t1 where a1 in ('a','b','d') group by a1,a2,b;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 range idx_t1_0,idx_t1_1,idx_t1_2 idx_t1_1 147 NULL 1503 Using where; Using index for group-by
1 SIMPLE t1 range idx_t1_0,idx_t1_1,idx_t1_2 idx_t1_1 147 NULL 753 Using where; Using index for group-by
explain select a1,a2,b, max(c) from t2 where a1 < 'd' group by a1,a2,b;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t2 range idx_t2_0,idx_t2_1,idx_t2_2 idx_t2_1 146 NULL # Using where; Using index for group-by
......@@ -668,99 +669,109 @@ d d411
d h412
d l421
d p422
#
# MariaDB: we dont have the following patch:
#
# commit 60a92a79a3b7fde3c6efe91799e344b977c8e5c3
# Author: Manuel Ung <mung@fb.com>
# Date: Thu Apr 19 23:06:27 2018 -0700
#
# Enhance group-by loose index scan
#
# So the following results are not very meaningful, but are still kept here
explain select a1,a2,b,max(c),min(c) from t1 where (a2 = 'a') and (b = 'b') group by a1;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 range idx_t1_0,idx_t1_1,idx_t1_2 idx_t1_1 147 NULL 126 Using where; Using index for group-by
1 SIMPLE t1 range NULL idx_t1_1 147 NULL 63 Using where; Using index for group-by
explain select a1,a2,b,max(c),min(c) from t1 where (a2 = 'a' or a2 = 'b') and (b = 'b') group by a1;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 range idx_t1_0,idx_t1_1,idx_t1_2 idx_t1_1 147 NULL 126 Using where; Using index for group-by
1 SIMPLE t1 index NULL idx_t1_1 163 NULL 1000 Using where; Using index
explain select a1,a2,b,max(c),min(c) from t1 where (a2 = 'a') and (b = 'b' or b = 'a') group by a1;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 range idx_t1_0,idx_t1_1,idx_t1_2 idx_t1_1 147 NULL 126 Using where; Using index for group-by
1 SIMPLE t1 index NULL idx_t1_1 163 NULL 1000 Using where; Using index
explain select a1,a2,b,max(c),min(c) from t1 where (a2 = 'a' or a2 = 'b') and (b = 'b' or b = 'a') group by a1;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 range idx_t1_0,idx_t1_1,idx_t1_2 idx_t1_1 147 NULL 126 Using where; Using index for group-by
1 SIMPLE t1 index NULL idx_t1_1 163 NULL 1000 Using where; Using index
explain select a1,max(c),min(c) from t1 where (a2 = 'a') and (b = 'b') group by a1;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 range idx_t1_0,idx_t1_1,idx_t1_2 idx_t1_1 147 NULL 126 Using where; Using index for group-by
1 SIMPLE t1 range NULL idx_t1_1 147 NULL 63 Using where; Using index for group-by
explain select a1,max(c),min(c) from t1 where (a2 = 'a' or a2 = 'b') and (b = 'b') group by a1;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 range idx_t1_0,idx_t1_1,idx_t1_2 idx_t1_1 147 NULL 126 Using where; Using index for group-by
1 SIMPLE t1 index NULL idx_t1_1 163 NULL 1000 Using where; Using index
explain select a1,max(c),min(c) from t1 where (a2 = 'a') and (b = 'b' or b = 'a') group by a1;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 range idx_t1_0,idx_t1_1,idx_t1_2 idx_t1_1 147 NULL 126 Using where; Using index for group-by
1 SIMPLE t1 index NULL idx_t1_1 163 NULL 1000 Using where; Using index
explain select a1,a2,b, max(c) from t1 where (b = 'b') group by a1,a2;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 range idx_t1_1,idx_t1_2 idx_t1_1 147 NULL 251 Using where; Using index for group-by
1 SIMPLE t1 range NULL idx_t1_1 147 NULL 126 Using where; Using index for group-by
explain select a1,a2,b, max(c) from t1 where (b = 'b' or b = 'a') group by a1,a2;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 range idx_t1_1,idx_t1_2 idx_t1_1 147 NULL 251 Using where; Using index for group-by
1 SIMPLE t1 index NULL idx_t1_1 163 NULL 1000 Using where; Using index
explain select a1,a2,b,min(c),max(c) from t1 where (b = 'b') group by a1,a2;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 range idx_t1_1,idx_t1_2 idx_t1_1 147 NULL 251 Using where; Using index for group-by
1 SIMPLE t1 range NULL idx_t1_1 147 NULL 126 Using where; Using index for group-by
explain select a1,a2,b,min(c),max(c) from t1 where (b = 'b' or b = 'a') group by a1,a2;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 range idx_t1_1,idx_t1_2 idx_t1_1 147 NULL 251 Using where; Using index for group-by
1 SIMPLE t1 index NULL idx_t1_1 163 NULL 1000 Using where; Using index
explain select a1,a2, max(c) from t1 where (b = 'b') group by a1,a2;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 range idx_t1_1,idx_t1_2 idx_t1_1 147 NULL 251 Using where; Using index for group-by
1 SIMPLE t1 range NULL idx_t1_1 147 NULL 126 Using where; Using index for group-by
explain select a1,a2, max(c) from t1 where (b = 'b' or b = 'a') group by a1,a2;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 range idx_t1_1,idx_t1_2 idx_t1_1 147 NULL 251 Using where; Using index for group-by
1 SIMPLE t1 index NULL idx_t1_1 163 NULL 1000 Using where; Using index
explain select a1,a2,b,max(c),min(c) from t2 where (a2 = 'a') and (b = 'b') group by a1;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t2 range idx_t2_0,idx_t2_1,idx_t2_2 idx_t2_1 163 NULL 126 Using where; Using index for group-by
1 SIMPLE t2 range NULL idx_t2_1 163 NULL 63 Using where; Using index for group-by
explain select a1,a2,b,max(c),min(c) from t2 where (a2 = 'a' or a2 = 'b') and (b = 'b') group by a1;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t2 range idx_t2_0,idx_t2_1,idx_t2_2 idx_t2_1 163 NULL 126 Using where; Using index for group-by
1 SIMPLE t2 index NULL idx_t2_1 163 NULL 1000 Using where; Using index
explain select a1,a2,b,max(c),min(c) from t2 where (a2 = 'a') and (b = 'b' or b = 'a') group by a1;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t2 range idx_t2_0,idx_t2_1,idx_t2_2 idx_t2_1 163 NULL 126 Using where; Using index for group-by
1 SIMPLE t2 index NULL idx_t2_1 163 NULL 1000 Using where; Using index
explain select a1,max(c),min(c) from t2 where (a2 = 'a') and (b = 'b') group by a1;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t2 range idx_t2_0,idx_t2_1,idx_t2_2 idx_t2_1 163 NULL 126 Using where; Using index for group-by
1 SIMPLE t2 range NULL idx_t2_1 163 NULL 63 Using where; Using index for group-by
explain select a1,max(c),min(c) from t2 where (a2 = 'a' or a2 = 'b') and (b = 'b') group by a1;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t2 range idx_t2_0,idx_t2_1,idx_t2_2 idx_t2_1 163 NULL 126 Using where; Using index for group-by
1 SIMPLE t2 index NULL idx_t2_1 163 NULL 1000 Using where; Using index
explain select a1,max(c),min(c) from t2 where (a2 = 'a') and (b = 'b' or b = 'a') group by a1;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t2 range idx_t2_0,idx_t2_1,idx_t2_2 idx_t2_1 163 NULL 126 Using where; Using index for group-by
1 SIMPLE t2 index NULL idx_t2_1 163 NULL 1000 Using where; Using index
explain select a1,a2,b, max(c) from t2 where (b = 'b') group by a1,a2;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t2 range idx_t2_1,idx_t2_2 idx_t2_1 146 NULL 251 Using where; Using index for group-by
1 SIMPLE t2 range NULL idx_t2_1 146 NULL 126 Using where; Using index for group-by
explain select a1,a2,b, max(c) from t2 where (b = 'b' or b = 'a') group by a1,a2;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t2 range idx_t2_1,idx_t2_2 idx_t2_1 146 NULL 251 Using where; Using index for group-by
1 SIMPLE t2 index NULL idx_t2_1 163 NULL 1000 Using where; Using index
explain select a1,a2,b,min(c),max(c) from t2 where (b = 'b') group by a1,a2;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t2 range idx_t2_1,idx_t2_2 idx_t2_1 163 NULL 251 Using where; Using index for group-by
1 SIMPLE t2 range NULL idx_t2_1 163 NULL 126 Using where; Using index for group-by
explain select a1,a2,b,min(c),max(c) from t2 where (b = 'b' or b = 'a') group by a1,a2;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t2 range idx_t2_1,idx_t2_2 idx_t2_1 163 NULL 251 Using where; Using index for group-by
1 SIMPLE t2 index NULL idx_t2_1 163 NULL 1000 Using where; Using index
explain select a1,a2, max(c) from t2 where (b = 'b') group by a1,a2;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t2 range idx_t2_1,idx_t2_2 idx_t2_1 146 NULL 251 Using where; Using index for group-by
1 SIMPLE t2 range NULL idx_t2_1 146 NULL 126 Using where; Using index for group-by
explain select a1,a2, max(c) from t2 where (b = 'b' or b = 'a') group by a1,a2;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t2 range idx_t2_1,idx_t2_2 idx_t2_1 146 NULL 251 Using where; Using index for group-by
1 SIMPLE t2 index NULL idx_t2_1 163 NULL 1000 Using where; Using index
explain select a1,a2,b,max(c),min(c) from t3 where (a2 = 'a') and (b = 'b') group by a1;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t3 range idx_t3_0,idx_t3_1,idx_t3_2 idx_t3_1 6 NULL 126 Using where; Using index for group-by
1 SIMPLE t3 range NULL idx_t3_1 6 NULL 63 Using where; Using index for group-by
explain select a1,a2,b,max(c),min(c) from t3 where (a2 = 'a' or a2 = 'b') and (b = 'b') group by a1;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t3 range idx_t3_0,idx_t3_1,idx_t3_2 idx_t3_1 6 NULL 126 Using where; Using index for group-by
1 SIMPLE t3 index NULL idx_t3_1 10 NULL 1000 Using where; Using index
explain select a1,a2,b,max(c),min(c) from t3 where (a2 = 'a') and (b = 'b' or b = 'a') group by a1;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t3 range idx_t3_0,idx_t3_1,idx_t3_2 idx_t3_1 6 NULL 126 Using where; Using index for group-by
1 SIMPLE t3 index NULL idx_t3_1 10 NULL 1000 Using where; Using index
explain select a1,max(c),min(c) from t3 where (a2 = 'a') and (b = 'b') group by a1;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t3 range idx_t3_0,idx_t3_1,idx_t3_2 idx_t3_1 6 NULL 126 Using where; Using index for group-by
1 SIMPLE t3 range NULL idx_t3_1 6 NULL 63 Using where; Using index for group-by
explain select a1,max(c),min(c) from t3 where (a2 = 'a' or a2 = 'b') and (b = 'b') group by a1;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t3 range idx_t3_0,idx_t3_1,idx_t3_2 idx_t3_1 6 NULL 126 Using where; Using index for group-by
1 SIMPLE t3 index NULL idx_t3_1 10 NULL 1000 Using where; Using index
explain select a1,max(c),min(c) from t3 where (a2 = 'a') and (b = 'b' or b = 'a') group by a1;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t3 range idx_t3_0,idx_t3_1,idx_t3_2 idx_t3_1 6 NULL 126 Using where; Using index for group-by
1 SIMPLE t3 index NULL idx_t3_1 10 NULL 1000 Using where; Using index
select a1,a2,b,max(c),min(c) from t1 where (a2 = 'a') and (b = 'b') group by a1;
a1 a2 b max(c) min(c)
a a b h112 e112
......@@ -769,22 +780,22 @@ c a b h312 e312
d a b h412 e412
select a1,a2,b,max(c),min(c) from t1 where (a2 = 'a' or a2 = 'b') and (b = 'b') group by a1;
a1 a2 b max(c) min(c)
a b b p122 e112
b b b p222 e212
c b b p322 e312
d b b p422 e412
a a b p122 e112
b a b p222 e212
c a b p322 e312
d a b p422 e412
select a1,a2,b,max(c),min(c) from t1 where (a2 = 'a') and (b = 'b' or b = 'a') group by a1;
a1 a2 b max(c) min(c)
a a b h112 a111
b a b h212 a211
c a b h312 a311
d a b h412 a411
a a a h112 a111
b a a h212 a211
c a a h312 a311
d a a h412 a411
select a1,a2,b,max(c),min(c) from t1 where (a2 = 'a' or a2 = 'b') and (b = 'b' or b = 'a') group by a1;
a1 a2 b max(c) min(c)
a b b p122 a111
b b b p222 a211
c b b p322 a311
d b b p422 a411
a a a p122 a111
b a a p222 a211
c a a p322 a311
d a a p422 a411
select a1,max(c),min(c) from t1 where (a2 = 'a') and (b = 'b') group by a1;
a1 max(c) min(c)
a h112 e112
......@@ -815,14 +826,14 @@ d a b h412
d b b p422
select a1,a2,b, max(c) from t1 where (b = 'b' or b = 'a') group by a1,a2;
a1 a2 b max(c)
a a b h112
a b b p122
b a b h212
b b b p222
c a b h312
c b b p322
d a b h412
d b b p422
a a a h112
a b a p122
b a a h212
b b a p222
c a a h312
c b a p322
d a a h412
d b a p422
select a1,a2,b,min(c),max(c) from t1 where (b = 'b') group by a1,a2;
a1 a2 b min(c) max(c)
a a b e112 h112
......@@ -835,14 +846,14 @@ d a b e412 h412
d b b m422 p422
select a1,a2,b,min(c),max(c) from t1 where (b = 'b' or b = 'a') group by a1,a2;
a1 a2 b min(c) max(c)
a a b a111 h112
a b b i121 p122
b a b a211 h212
b b b i221 p222
c a b a311 h312
c b b i321 p322
d a b a411 h412
d b b i421 p422
a a a a111 h112
a b a i121 p122
b a a a211 h212
b b a i221 p222
c a a a311 h312
c b a i321 p322
d a a a411 h412
d b a i421 p422
select a1,a2, max(c) from t1 where (b = 'b') group by a1,a2;
a1 a2 max(c)
a a h112
......@@ -872,17 +883,18 @@ d a b h412 e412
e a b NULL NULL
select a1,a2,b,max(c),min(c) from t2 where (a2 = 'a' or a2 = 'b') and (b = 'b') group by a1;
a1 a2 b max(c) min(c)
a b b p122 e112
b b b p222 e212
c b b p322 e312
d b b p422 e412
a a b p122 e112
b a b p222 e212
c a b p322 e312
d a b p422 e412
e a b NULL NULL
select a1,a2,b,max(c),min(c) from t2 where (a2 = 'a') and (b = 'b' or b = 'a') group by a1;
a1 a2 b max(c) min(c)
a a b h112 a111
b a b h212 a211
c a b h312 a311
d a b h412 a411
e a b NULL NULL
a a a h112 a111
b a a h212 a211
c a a h312 a311
d a a h412 a411
e a a NULL NULL
select a1,max(c),min(c) from t2 where (a2 = 'a') and (b = 'b') group by a1;
a1 max(c) min(c)
a h112 e112
......@@ -896,6 +908,7 @@ a p122 e112
b p222 e212
c p322 e312
d p422 e412
e NULL NULL
select a1,max(c),min(c) from t2 where (a2 = 'a') and (b = 'b' or b = 'a') group by a1;
a1 max(c) min(c)
a h112 a111
......@@ -916,15 +929,15 @@ d b b p422
e a b NULL
select a1,a2,b, max(c) from t2 where (b = 'b' or b = 'a') group by a1,a2;
a1 a2 b max(c)
a a b h112
a b b p122
b a b h212
b b b p222
c a b h312
c b b p322
d a b h412
d b b p422
e a b NULL
a a a h112
a b a p122
b a a h212
b b a p222
c a a h312
c b a p322
d a a h412
d b a p422
e a a NULL
select a1,a2,b,min(c),max(c) from t2 where (b = 'b') group by a1,a2;
a1 a2 b min(c) max(c)
a a b e112 h112
......@@ -938,15 +951,15 @@ d b b m422 p422
e a b NULL NULL
select a1,a2,b,min(c),max(c) from t2 where (b = 'b' or b = 'a') group by a1,a2;
a1 a2 b min(c) max(c)
a a b a111 h112
a b b i121 p122
b a b a211 h212
b b b i221 p222
c a b a311 h312
c b b i321 p322
d a b a411 h412
d b b i421 p422
e a b NULL NULL
a a a a111 h112
a b a i121 p122
b a a a211 h212
b b a i221 p222
c a a a311 h312
c b a i321 p322
d a a a411 h412
d b a i421 p422
e a a NULL NULL
select a1,a2, max(c) from t2 where (b = 'b') group by a1,a2;
a1 a2 max(c)
a a h112
......@@ -976,14 +989,14 @@ b a b h212 e212
c a b h312 e312
select a1,a2,b,max(c),min(c) from t3 where (a2 = 'a' or a2 = 'b') and (b = 'b') group by a1;
a1 a2 b max(c) min(c)
a b b p122 e112
b b b p222 e212
c b b p322 e312
a a b p122 e112
b a b p222 e212
c a b p322 e312
select a1,a2,b,max(c),min(c) from t3 where (a2 = 'a') and (b = 'b' or b = 'a') group by a1;
a1 a2 b max(c) min(c)
a a b h112 a111
b a b h212 a211
c a b h312 a311
a a a h112 a111
b a a h212 a211
c a a h312 a311
select a1,max(c),min(c) from t3 where (a2 = 'a') and (b = 'b') group by a1;
a1 max(c) min(c)
a h112 e112
......@@ -1001,37 +1014,41 @@ b h212 a211
c h312 a311
explain select a1,a2,b,min(c) from t2 where (a2 = 'a') and b is NULL group by a1;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t2 range idx_t2_0,idx_t2_1,idx_t2_2 idx_t2_1 163 NULL 126 Using where; Using index for group-by
1 SIMPLE t2 range NULL idx_t2_1 163 NULL 63 Using where; Using index for group-by
explain select a1,a2,b,min(c) from t2 where (a2 = 'a' or a2 = 'b') and b is NULL group by a1;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t2 range idx_t2_0,idx_t2_1,idx_t2_2 idx_t2_1 163 NULL 126 Using where; Using index for group-by
1 SIMPLE t2 index NULL idx_t2_1 163 NULL 1000 Using where; Using index
explain select a1,a2,b,max(c) from t2 where (a2 = 'a') and b is NULL group by a1;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t2 range idx_t2_0,idx_t2_1,idx_t2_2 idx_t2_1 146 NULL 126 Using where; Using index for group-by
1 SIMPLE t2 range NULL idx_t2_1 146 NULL 63 Using where; Using index for group-by
explain select a1,a2,b,max(c) from t2 where (a2 = 'a' or a2 = 'b') and b is NULL group by a1;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t2 range idx_t2_0,idx_t2_1,idx_t2_2 idx_t2_1 146 NULL 126 Using where; Using index for group-by
1 SIMPLE t2 index NULL idx_t2_1 163 NULL 1000 Using where; Using index
explain select a1,a2,b,min(c) from t2 where b is NULL group by a1,a2;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t2 range idx_t2_1,idx_t2_2 idx_t2_1 163 NULL 251 Using where; Using index for group-by
1 SIMPLE t2 range NULL idx_t2_1 163 NULL 126 Using where; Using index for group-by
explain select a1,a2,b,max(c) from t2 where b is NULL group by a1,a2;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t2 range idx_t2_1,idx_t2_2 idx_t2_1 146 NULL 251 Using where; Using index for group-by
1 SIMPLE t2 range NULL idx_t2_1 146 NULL 126 Using where; Using index for group-by
explain select a1,a2,b,min(c),max(c) from t2 where b is NULL group by a1,a2;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t2 range idx_t2_1,idx_t2_2 idx_t2_1 163 NULL 251 Using where; Using index for group-by
1 SIMPLE t2 range NULL idx_t2_1 163 NULL 126 Using where; Using index for group-by
select a1,a2,b,min(c) from t2 where (a2 = 'a') and b is NULL group by a1;
a1 a2 b min(c)
a a NULL a777
c a NULL c777
select a1,a2,b,min(c) from t2 where (a2 = 'a' or a2 = 'b') and b is NULL group by a1;
a1 a2 b min(c)
a a NULL a777
c a NULL c777
select a1,a2,b,max(c) from t2 where (a2 = 'a') and b is NULL group by a1;
a1 a2 b max(c)
a a NULL a999
c a NULL c999
select a1,a2,b,max(c) from t2 where (a2 = 'a' or a2 = 'b') and b is NULL group by a1;
a1 a2 b max(c)
a a NULL a999
c a NULL c999
select a1,a2,b,min(c) from t2 where b is NULL group by a1,a2;
a1 a2 b min(c)
a a NULL a777
......@@ -1050,97 +1067,97 @@ a a NULL a777 a999
c a NULL c777 c999
explain select a1,a2,b, max(c) from t1 where (c > 'b1') group by a1,a2,b;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 range idx_t1_1,idx_t1_2 idx_t1_1 147 NULL # Using where; Using index for group-by
1 SIMPLE t1 range NULL idx_t1_1 147 NULL # Using where; Using index for group-by
explain select a1,a2,b,min(c),max(c) from t1 where (c > 'b1') group by a1,a2,b;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 range idx_t1_1,idx_t1_2 idx_t1_1 163 NULL 501 Using where; Using index for group-by
1 SIMPLE t1 range NULL idx_t1_1 163 NULL 251 Using where; Using index for group-by
explain select a1,a2,b, max(c) from t1 where (c > 'f123') group by a1,a2,b;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 range idx_t1_1,idx_t1_2 idx_t1_1 147 NULL 501 Using where; Using index for group-by
1 SIMPLE t1 range NULL idx_t1_1 147 NULL 251 Using where; Using index for group-by
explain select a1,a2,b,min(c),max(c) from t1 where (c > 'f123') group by a1,a2,b;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 range idx_t1_1,idx_t1_2 idx_t1_1 163 NULL 501 Using where; Using index for group-by
1 SIMPLE t1 range NULL idx_t1_1 163 NULL 251 Using where; Using index for group-by
explain select a1,a2,b, max(c) from t1 where (c < 'a0') group by a1,a2,b;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 range idx_t1_1,idx_t1_2 idx_t1_1 163 NULL 501 Using where; Using index for group-by
1 SIMPLE t1 range NULL idx_t1_1 163 NULL 251 Using where; Using index for group-by
explain select a1,a2,b,min(c),max(c) from t1 where (c < 'a0') group by a1,a2,b;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 range idx_t1_1,idx_t1_2 idx_t1_1 163 NULL 501 Using where; Using index for group-by
1 SIMPLE t1 range NULL idx_t1_1 163 NULL 251 Using where; Using index for group-by
explain select a1,a2,b, max(c) from t1 where (c < 'k321') group by a1,a2,b;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 range idx_t1_1,idx_t1_2 idx_t1_1 163 NULL 501 Using where; Using index for group-by
1 SIMPLE t1 range NULL idx_t1_1 163 NULL 251 Using where; Using index for group-by
explain select a1,a2,b,min(c),max(c) from t1 where (c < 'k321') group by a1,a2,b;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 range idx_t1_1,idx_t1_2 idx_t1_1 163 NULL 501 Using where; Using index for group-by
1 SIMPLE t1 range NULL idx_t1_1 163 NULL 251 Using where; Using index for group-by
explain select a1,a2,b, max(c) from t1 where (c < 'a0') or (c > 'b1') group by a1,a2,b;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 range idx_t1_1,idx_t1_2 idx_t1_1 163 NULL 501 Using where; Using index for group-by
1 SIMPLE t1 range NULL idx_t1_1 163 NULL 251 Using where; Using index for group-by
explain select a1,a2,b,min(c),max(c) from t1 where (c < 'a0') or (c > 'b1') group by a1,a2,b;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 range idx_t1_1,idx_t1_2 idx_t1_1 163 NULL 501 Using where; Using index for group-by
1 SIMPLE t1 range NULL idx_t1_1 163 NULL 251 Using where; Using index for group-by
explain select a1,a2,b, max(c) from t1 where (c > 'b1') or (c <= 'g1') group by a1,a2,b;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 range idx_t1_1,idx_t1_2 idx_t1_1 147 NULL 501 Using where; Using index for group-by
1 SIMPLE t1 range NULL idx_t1_1 147 NULL 251 Using where; Using index for group-by
explain select a1,a2,b,min(c),max(c) from t1 where (c > 'b1') or (c <= 'g1') group by a1,a2,b;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 range idx_t1_1,idx_t1_2 idx_t1_1 147 NULL 501 Using where; Using index for group-by
1 SIMPLE t1 range NULL idx_t1_1 147 NULL 251 Using where; Using index for group-by
explain select a1,a2,b,min(c),max(c) from t1 where (c > 'b111') and (c <= 'g112') group by a1,a2,b;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 range idx_t1_1,idx_t1_2 idx_t1_1 163 NULL 501 Using where; Using index for group-by
1 SIMPLE t1 range NULL idx_t1_1 163 NULL 251 Using where; Using index for group-by
explain select a1,a2,b,min(c),max(c) from t1 where (c < 'c5') or (c = 'g412') or (c = 'k421') group by a1,a2,b;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 range idx_t1_1,idx_t1_2 idx_t1_1 163 NULL 501 Using where; Using index for group-by
1 SIMPLE t1 range NULL idx_t1_1 163 NULL 251 Using where; Using index for group-by
explain select a1,a2,b,min(c),max(c) from t1 where ((c > 'b111') and (c <= 'g112')) or ((c > 'd000') and (c <= 'i110')) group by a1,a2,b;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 range idx_t1_1,idx_t1_2 idx_t1_1 163 NULL 501 Using where; Using index for group-by
1 SIMPLE t1 range NULL idx_t1_1 163 NULL 251 Using where; Using index for group-by
explain select a1,a2,b,min(c),max(c) from t1 where (c between 'b111' and 'g112') or (c between 'd000' and 'i110') group by a1,a2,b;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 range idx_t1_1,idx_t1_2 idx_t1_1 163 NULL 501 Using where; Using index for group-by
1 SIMPLE t1 range NULL idx_t1_1 163 NULL 251 Using where; Using index for group-by
explain select a1,a2,b, max(c) from t2 where (c > 'b1') group by a1,a2,b;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t2 range idx_t2_1,idx_t2_2 idx_t2_1 146 NULL # Using where; Using index for group-by
1 SIMPLE t2 range NULL idx_t2_1 146 NULL # Using where; Using index for group-by
explain select a1,a2,b,min(c),max(c) from t2 where (c > 'b1') group by a1,a2,b;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t2 range idx_t2_1,idx_t2_2 idx_t2_1 163 NULL # Using where; Using index for group-by
1 SIMPLE t2 range NULL idx_t2_1 163 NULL # Using where; Using index for group-by
explain select a1,a2,b, max(c) from t2 where (c > 'f123') group by a1,a2,b;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t2 range idx_t2_1,idx_t2_2 idx_t2_1 146 NULL # Using where; Using index for group-by
1 SIMPLE t2 range NULL idx_t2_1 146 NULL # Using where; Using index for group-by
explain select a1,a2,b,min(c),max(c) from t2 where (c > 'f123') group by a1,a2,b;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t2 range idx_t2_1,idx_t2_2 idx_t2_1 163 NULL # Using where; Using index for group-by
1 SIMPLE t2 range NULL idx_t2_1 163 NULL # Using where; Using index for group-by
explain select a1,a2,b, max(c) from t2 where (c < 'a0') group by a1,a2,b;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t2 range idx_t2_1,idx_t2_2 idx_t2_1 163 NULL # Using where; Using index for group-by
1 SIMPLE t2 range NULL idx_t2_1 163 NULL # Using where; Using index for group-by
explain select a1,a2,b,min(c),max(c) from t2 where (c < 'a0') group by a1,a2,b;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t2 range idx_t2_1,idx_t2_2 idx_t2_1 163 NULL # Using where; Using index for group-by
1 SIMPLE t2 range NULL idx_t2_1 163 NULL # Using where; Using index for group-by
explain select a1,a2,b, max(c) from t2 where (c < 'k321') group by a1,a2,b;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t2 range idx_t2_1,idx_t2_2 idx_t2_1 163 NULL # Using where; Using index for group-by
1 SIMPLE t2 range NULL idx_t2_1 163 NULL # Using where; Using index for group-by
explain select a1,a2,b,min(c),max(c) from t2 where (c < 'k321') group by a1,a2,b;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t2 range idx_t2_1,idx_t2_2 idx_t2_1 163 NULL # Using where; Using index for group-by
1 SIMPLE t2 range NULL idx_t2_1 163 NULL # Using where; Using index for group-by
explain select a1,a2,b, max(c) from t2 where (c < 'a0') or (c > 'b1') group by a1,a2,b;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t2 range idx_t2_1,idx_t2_2 idx_t2_1 163 NULL # Using where; Using index for group-by
1 SIMPLE t2 range NULL idx_t2_1 163 NULL # Using where; Using index for group-by
explain select a1,a2,b,min(c),max(c) from t2 where (c < 'a0') or (c > 'b1') group by a1,a2,b;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t2 range idx_t2_1,idx_t2_2 idx_t2_1 163 NULL # Using where; Using index for group-by
1 SIMPLE t2 range NULL idx_t2_1 163 NULL # Using where; Using index for group-by
explain select a1,a2,b, max(c) from t2 where (c > 'b1') or (c <= 'g1') group by a1,a2,b;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t2 range idx_t2_1,idx_t2_2 idx_t2_1 146 NULL # Using where; Using index for group-by
1 SIMPLE t2 range NULL idx_t2_1 146 NULL # Using where; Using index for group-by
explain select a1,a2,b,min(c),max(c) from t2 where (c > 'b1') or (c <= 'g1') group by a1,a2,b;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t2 range idx_t2_1,idx_t2_2 idx_t2_1 163 NULL # Using where; Using index for group-by
1 SIMPLE t2 range NULL idx_t2_1 163 NULL # Using where; Using index for group-by
explain select a1,a2,b,min(c),max(c) from t2 where (c > 'b111') and (c <= 'g112') group by a1,a2,b;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t2 range idx_t2_1,idx_t2_2 idx_t2_1 163 NULL # Using where; Using index for group-by
1 SIMPLE t2 range NULL idx_t2_1 163 NULL # Using where; Using index for group-by
explain select a1,a2,b,min(c),max(c) from t2 where (c < 'c5') or (c = 'g412') or (c = 'k421') group by a1,a2,b;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t2 range idx_t2_1,idx_t2_2 idx_t2_1 163 NULL # Using where; Using index for group-by
1 SIMPLE t2 range NULL idx_t2_1 163 NULL # Using where; Using index for group-by
explain select a1,a2,b,min(c),max(c) from t2 where ((c > 'b111') and (c <= 'g112')) or ((c > 'd000') and (c <= 'i110')) group by a1,a2,b;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t2 range idx_t2_1,idx_t2_2 idx_t2_1 163 NULL # Using where; Using index for group-by
1 SIMPLE t2 range NULL idx_t2_1 163 NULL # Using where; Using index for group-by
select a1,a2,b, max(c) from t1 where (c > 'b1') group by a1,a2,b;
a1 a2 b max(c)
a a a d111
......@@ -1562,35 +1579,36 @@ explain select a1,a2,b,min(c),max(c) from t1
where exists ( select * from t2 where t2.c = t1.c )
group by a1,a2,b;
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY t1 index idx_t1_1,idx_t1_2 idx_t1_1 163 NULL 1000 Using where; Using index
2 DEPENDENT SUBQUERY t2 index NULL idx_t2_1 163 NULL 1000 Using where; Using index
1 PRIMARY t1 index NULL idx_t1_1 163 NULL 1000 Using index
1 PRIMARY <subquery2> eq_ref distinct_key distinct_key 16 func 1
2 MATERIALIZED t2 index NULL idx_t2_1 163 NULL 1000 Using index
explain select a1,a2,b,min(c),max(c) from t1
where exists ( select * from t2 where t2.c > 'b1' )
group by a1,a2,b;
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY t1 range idx_t1_1,idx_t1_2 idx_t1_1 147 NULL 501 Using index for group-by
1 PRIMARY t1 index NULL idx_t1_1 163 NULL 1000 Using index
2 SUBQUERY t2 index NULL idx_t2_1 163 NULL 1000 Using where; Using index
explain select a1,a2,b,min(c),max(c) from t1 where (a1 >= 'c' or a2 < 'b') and (b > 'a') group by a1,a2,b;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 range idx_t1_0,idx_t1_1,idx_t1_2 idx_t1_1 147 NULL 501 Using where; Using index for group-by
1 SIMPLE t1 range idx_t1_0,idx_t1_1,idx_t1_2 idx_t1_1 147 NULL 251 Using where; Using index for group-by
explain select a1,a2,b,min(c),max(c) from t1 where (a1 >= 'c' or a2 < 'b') and (c > 'b111') group by a1,a2,b;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 range idx_t1_0,idx_t1_1,idx_t1_2 idx_t1_1 163 NULL 501 Using where; Using index for group-by
1 SIMPLE t1 range idx_t1_0,idx_t1_1,idx_t1_2 idx_t1_1 163 NULL 251 Using where; Using index for group-by
explain select a1,a2,b,min(c),max(c) from t1 where (a2 >= 'b') and (b = 'a') and (c > 'b111') group by a1,a2,b;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 range idx_t1_1,idx_t1_2 idx_t1_1 163 NULL 501 Using where; Using index for group-by
1 SIMPLE t1 range NULL idx_t1_1 163 NULL 251 Using where; Using index for group-by
explain select a1,a2,b,min(c) from t1 where ((a1 > 'a') or (a1 < '9')) and ((a2 >= 'b') and (a2 < 'z')) and (b = 'a') and ((c < 'h112') or (c = 'j121') or (c > 'k121' and c < 'm122') or (c > 'o122')) group by a1,a2,b;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 range idx_t1_0,idx_t1_1,idx_t1_2 idx_t1_1 163 NULL 1002 Using where; Using index for group-by
1 SIMPLE t1 range idx_t1_0,idx_t1_1,idx_t1_2 idx_t1_1 163 NULL 502 Using where; Using index for group-by
explain select a1,a2,b,min(c) from t1 where ((a1 > 'a') or (a1 < '9')) and ((a2 >= 'b') and (a2 < 'z')) and (b = 'a') and ((c = 'j121') or (c > 'k121' and c < 'm122') or (c > 'o122') or (c < 'h112') or (c = 'c111')) group by a1,a2,b;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 range idx_t1_0,idx_t1_1,idx_t1_2 idx_t1_1 163 NULL 1002 Using where; Using index for group-by
1 SIMPLE t1 range idx_t1_0,idx_t1_1,idx_t1_2 idx_t1_1 163 NULL 502 Using where; Using index for group-by
explain select a1,a2,b,min(c) from t1 where (a1 > 'a') and (a2 > 'a') and (b = 'c') group by a1,a2,b;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 range idx_t1_0,idx_t1_1,idx_t1_2 idx_t1_1 147 NULL 501 Using where; Using index for group-by
1 SIMPLE t1 range idx_t1_0,idx_t1_1,idx_t1_2 idx_t1_1 147 NULL 251 Using where; Using index for group-by
explain select a1,a2,b,min(c) from t1 where (ord(a1) > 97) and (ord(a2) + ord(a1) > 194) and (b = 'c') group by a1,a2,b;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 range idx_t1_1,idx_t1_2 idx_t1_1 147 NULL 501 Using where; Using index for group-by
1 SIMPLE t1 range NULL idx_t1_1 147 NULL 251 Using where; Using index for group-by
explain select a1,a2,b,min(c),max(c) from t2 where (a1 >= 'c' or a2 < 'b') and (b > 'a') group by a1,a2,b;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t2 range idx_t2_0,idx_t2_1,idx_t2_2 idx_t2_1 163 NULL # Using where; Using index for group-by
......@@ -1599,7 +1617,7 @@ id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t2 range idx_t2_0,idx_t2_1,idx_t2_2 idx_t2_1 163 NULL # Using where; Using index for group-by
explain select a1,a2,b,min(c),max(c) from t2 where (a2 >= 'b') and (b = 'a') and (c > 'b111') group by a1,a2,b;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t2 range idx_t2_1,idx_t2_2 idx_t2_1 163 NULL # Using where; Using index for group-by
1 SIMPLE t2 range NULL idx_t2_1 163 NULL # Using where; Using index for group-by
explain select a1,a2,b,min(c) from t2 where ((a1 > 'a') or (a1 < '9')) and ((a2 >= 'b') and (a2 < 'z')) and (b = 'a') and ((c < 'h112') or (c = 'j121') or (c > 'k121' and c < 'm122') or (c > 'o122')) group by a1,a2,b;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t2 range idx_t2_0,idx_t2_1,idx_t2_2 idx_t2_1 163 NULL # Using where; Using index for group-by
......@@ -1695,31 +1713,31 @@ select a1,a2,b,min(c) from t2 where (a1 > 'a') and (a2 > 'a') and (b = 'c') grou
a1 a2 b min(c)
explain select a1,a2,b from t1 where (a1 >= 'c' or a2 < 'b') and (b > 'a') group by a1,a2,b;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 range idx_t1_0,idx_t1_1,idx_t1_2 idx_t1_1 147 NULL 501 Using where; Using index for group-by
1 SIMPLE t1 range idx_t1_0,idx_t1_1,idx_t1_2 idx_t1_1 147 NULL 251 Using where; Using index for group-by
explain select a1,a2,b from t1 where (a2 >= 'b') and (b = 'a') group by a1,a2,b;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 range idx_t1_1,idx_t1_2 idx_t1_1 147 NULL 501 Using where; Using index for group-by
1 SIMPLE t1 range NULL idx_t1_1 147 NULL 251 Using where; Using index for group-by
explain select a1,a2,b,c from t1 where (a2 >= 'b') and (b = 'a') and (c = 'i121') group by a1,a2,b;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 range idx_t1_1,idx_t1_2 idx_t1_1 163 NULL 501 Using where; Using index for group-by
1 SIMPLE t1 range NULL idx_t1_1 163 NULL 251 Using where; Using index for group-by
explain select a1,a2,b,c from t1 where (a2 >= 'b') and (b = 'a') and (c = 'i121' or c = 'i121') group by a1,a2,b;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 range idx_t1_1,idx_t1_2 idx_t1_1 163 NULL 501 Using where; Using index for group-by
1 SIMPLE t1 range NULL idx_t1_1 163 NULL 251 Using where; Using index for group-by
explain select a1,a2,b from t1 where (a1 > 'a') and (a2 > 'a') and (b = 'c') group by a1,a2,b;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 range idx_t1_0,idx_t1_1,idx_t1_2 idx_t1_1 147 NULL 501 Using where; Using index for group-by
1 SIMPLE t1 range idx_t1_0,idx_t1_1,idx_t1_2 idx_t1_1 147 NULL 251 Using where; Using index for group-by
explain select a1,a2,b from t2 where (a1 >= 'c' or a2 < 'b') and (b > 'a') group by a1,a2,b;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t2 range idx_t2_0,idx_t2_1,idx_t2_2 idx_t2_1 146 NULL # Using where; Using index for group-by
explain select a1,a2,b from t2 where (a2 >= 'b') and (b = 'a') group by a1,a2,b;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t2 range idx_t2_1,idx_t2_2 idx_t2_1 146 NULL # Using where; Using index for group-by
1 SIMPLE t2 range NULL idx_t2_1 146 NULL # Using where; Using index for group-by
explain select a1,a2,b,c from t2 where (a2 >= 'b') and (b = 'a') and (c = 'i121') group by a1,a2,b;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t2 range idx_t2_1,idx_t2_2 idx_t2_1 163 NULL # Using where; Using index for group-by
1 SIMPLE t2 range NULL idx_t2_1 163 NULL # Using where; Using index for group-by
explain select a1,a2,b,c from t2 where (a2 >= 'b') and (b = 'a') and (c = 'i121' or c = 'i121') group by a1,a2,b;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t2 range idx_t2_1,idx_t2_2 idx_t2_1 163 NULL # Using where; Using index for group-by
1 SIMPLE t2 range NULL idx_t2_1 163 NULL # Using where; Using index for group-by
explain select a1,a2,b from t2 where (a1 > 'a') and (a2 > 'a') and (b = 'c') group by a1,a2,b;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t2 range idx_t2_0,idx_t2_1,idx_t2_2 idx_t2_1 146 NULL # Using where; Using index for group-by
......@@ -1770,50 +1788,50 @@ select a1,a2,b from t2 where (a1 > 'a') and (a2 > 'a') and (b = 'c') group by a1
a1 a2 b
explain select distinct a1,a2,b from t1;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 range idx_t1_1,idx_t1_2 idx_t1_1 147 NULL 501 Using index for group-by
1 SIMPLE t1 range NULL idx_t1_1 147 NULL 251 Using index for group-by
explain select distinct a1,a2,b from t1 where (a2 >= 'b') and (b = 'a');
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 range idx_t1_1,idx_t1_2 idx_t1_1 147 NULL 501 Using where; Using index for group-by
1 SIMPLE t1 range NULL idx_t1_1 147 NULL 251 Using where; Using index for group-by
explain extended select distinct a1,a2,b,c from t1 where (a2 >= 'b') and (b = 'a') and (c = 'i121');
id select_type table type possible_keys key key_len ref rows filtered Extra
1 SIMPLE t1 range idx_t1_1 idx_t1_1 163 NULL 1001 99.90 Using where; Using index for group-by
1 SIMPLE t1 range NULL idx_t1_1 163 NULL 501 100.00 Using where; Using index for group-by
Warnings:
Note 1003 /* select#1 */ select distinct `test`.`t1`.`a1` AS `a1`,`test`.`t1`.`a2` AS `a2`,`test`.`t1`.`b` AS `b`,`test`.`t1`.`c` AS `c` from `test`.`t1` where ((`test`.`t1`.`c` = 'i121') and (`test`.`t1`.`b` = 'a') and (`test`.`t1`.`a2` >= 'b'))
Note 1003 select distinct `test`.`t1`.`a1` AS `a1`,`test`.`t1`.`a2` AS `a2`,`test`.`t1`.`b` AS `b`,`test`.`t1`.`c` AS `c` from `test`.`t1` where `test`.`t1`.`b` = 'a' and `test`.`t1`.`c` = 'i121' and `test`.`t1`.`a2` >= 'b'
explain select distinct a1,a2,b from t1 where (a1 > 'a') and (a2 > 'a') and (b = 'c');
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 range idx_t1_0,idx_t1_1,idx_t1_2 idx_t1_1 147 NULL 501 Using where; Using index for group-by
1 SIMPLE t1 range idx_t1_0,idx_t1_1,idx_t1_2 idx_t1_1 147 NULL 251 Using where; Using index for group-by
explain select distinct b from t1 where (a2 >= 'b') and (b = 'a');
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 index idx_t1_1,idx_t1_2 idx_t1_2 147 NULL 1000 Using where; Using index
1 SIMPLE t1 index NULL idx_t1_2 147 NULL 1000 Using where; Using index
explain select distinct a1 from t1 where a1 in ('a', 'd') and a2 = 'b';
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 range idx_t1_0,idx_t1_1,idx_t1_2 idx_t1_1 130 NULL 252 Using where; Using index for group-by
1 SIMPLE t1 range idx_t1_0,idx_t1_1,idx_t1_2 idx_t1_1 130 NULL 126 Using where; Using index for group-by
explain select distinct a1 from t1 where a1 in ('a', 'd') and a2 = 'e';
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 range idx_t1_0,idx_t1_1,idx_t1_2 idx_t1_1 130 NULL 252 Using where; Using index for group-by
1 SIMPLE t1 range idx_t1_0,idx_t1_1,idx_t1_2 idx_t1_1 130 NULL 126 Using where; Using index for group-by
explain select distinct a1,a2,b from t2;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t2 range idx_t2_1,idx_t2_2 idx_t2_1 146 NULL # Using index for group-by
1 SIMPLE t2 range NULL idx_t2_1 146 NULL # Using index for group-by
explain select distinct a1,a2,b from t2 where (a2 >= 'b') and (b = 'a');
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t2 range idx_t2_1,idx_t2_2 idx_t2_1 146 NULL # Using where; Using index for group-by
1 SIMPLE t2 range NULL idx_t2_1 146 NULL # Using where; Using index for group-by
explain extended select distinct a1,a2,b,c from t2 where (a2 >= 'b') and (b = 'a') and (c = 'i121');
id select_type table type possible_keys key key_len ref rows filtered Extra
1 SIMPLE t2 range idx_t2_1 idx_t2_1 163 NULL 1001 99.90 Using where; Using index for group-by
1 SIMPLE t2 range NULL idx_t2_1 163 NULL 501 100.00 Using where; Using index for group-by
Warnings:
Note 1003 /* select#1 */ select distinct `test`.`t2`.`a1` AS `a1`,`test`.`t2`.`a2` AS `a2`,`test`.`t2`.`b` AS `b`,`test`.`t2`.`c` AS `c` from `test`.`t2` where ((`test`.`t2`.`c` = 'i121') and (`test`.`t2`.`b` = 'a') and (`test`.`t2`.`a2` >= 'b'))
Note 1003 select distinct `test`.`t2`.`a1` AS `a1`,`test`.`t2`.`a2` AS `a2`,`test`.`t2`.`b` AS `b`,`test`.`t2`.`c` AS `c` from `test`.`t2` where `test`.`t2`.`b` = 'a' and `test`.`t2`.`c` = 'i121' and `test`.`t2`.`a2` >= 'b'
explain select distinct a1,a2,b from t2 where (a1 > 'a') and (a2 > 'a') and (b = 'c');
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t2 range idx_t2_0,idx_t2_1,idx_t2_2 idx_t2_1 146 NULL # Using where; Using index for group-by
explain select distinct b from t2 where (a2 >= 'b') and (b = 'a');
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t2 index idx_t2_1,idx_t2_2 idx_t2_2 146 NULL 1000 Using where; Using index
1 SIMPLE t2 index NULL idx_t2_2 146 NULL 1000 Using where; Using index
explain select distinct a1 from t2 where a1 in ('a', 'd') and a2 = 'b';
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t2 range idx_t2_0,idx_t2_1,idx_t2_2 idx_t2_1 129 NULL 252 Using where; Using index for group-by
1 SIMPLE t2 range idx_t2_0,idx_t2_1,idx_t2_2 idx_t2_1 129 NULL 126 Using where; Using index for group-by
explain select distinct a1 from t2 where a1 in ('a', 'd') and a2 = 'e';
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t2 range idx_t2_0,idx_t2_1,idx_t2_2 idx_t2_1 129 NULL 252 Using where; Using index for group-by
1 SIMPLE t2 range idx_t2_0,idx_t2_1,idx_t2_2 idx_t2_1 129 NULL 126 Using where; Using index for group-by
select distinct a1,a2,b from t1;
a1 a2 b
a a a
......@@ -1942,40 +1960,40 @@ c e
d e
explain select distinct a1,a2,b from t1;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 range idx_t1_1,idx_t1_2 idx_t1_1 147 NULL 501 Using index for group-by
1 SIMPLE t1 range NULL idx_t1_1 147 NULL 251 Using index for group-by
explain select distinct a1,a2,b from t1 where (a2 >= 'b') and (b = 'a') group by a1,a2,b;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 range idx_t1_1,idx_t1_2 idx_t1_1 147 NULL 501 Using where; Using index for group-by
1 SIMPLE t1 range NULL idx_t1_1 147 NULL 251 Using where; Using index for group-by
explain select distinct a1,a2,b,c from t1 where (a2 >= 'b') and (b = 'a') and (c = 'i121') group by a1,a2,b;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 range idx_t1_1,idx_t1_2 idx_t1_1 163 NULL 501 Using where; Using index for group-by
1 SIMPLE t1 range NULL idx_t1_1 163 NULL 251 Using where; Using index for group-by
explain select distinct a1,a2,b from t1 where (a1 > 'a') and (a2 > 'a') and (b = 'c') group by a1,a2,b;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 range idx_t1_0,idx_t1_1,idx_t1_2 idx_t1_1 147 NULL 501 Using where; Using index for group-by
1 SIMPLE t1 range idx_t1_0,idx_t1_1,idx_t1_2 idx_t1_1 147 NULL 251 Using where; Using index for group-by
explain select distinct b from t1 where (a2 >= 'b') and (b = 'a') group by a1,a2,b;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 range idx_t1_1,idx_t1_2 idx_t1_1 147 NULL 501 Using where; Using index for group-by; Using temporary; Using filesort
1 SIMPLE t1 range NULL idx_t1_1 147 NULL 251 Using where; Using index for group-by; Using temporary; Using filesort
explain select distinct a1 from t1 where a1 in ('a', 'd') and a2 = 'b' group by a1;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 range idx_t1_0,idx_t1_1,idx_t1_2 idx_t1_1 130 NULL 252 Using where; Using index for group-by
1 SIMPLE t1 range idx_t1_0,idx_t1_1,idx_t1_2 idx_t1_1 130 NULL 126 Using where; Using index for group-by
explain select distinct a1 from t1 where a1 in ('a', 'd') and a2 = 'e' group by a1;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 range idx_t1_0,idx_t1_1,idx_t1_2 idx_t1_1 130 NULL 252 Using where; Using index for group-by
1 SIMPLE t1 range idx_t1_0,idx_t1_1,idx_t1_2 idx_t1_1 130 NULL 126 Using where; Using index for group-by
explain select distinct a1,a2,b from t2;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t2 range idx_t2_1,idx_t2_2 idx_t2_1 146 NULL # Using index for group-by
1 SIMPLE t2 range NULL idx_t2_1 146 NULL # Using index for group-by
explain select distinct a1,a2,b from t2 where (a2 >= 'b') and (b = 'a') group by a1,a2,b;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t2 range idx_t2_1,idx_t2_2 idx_t2_1 146 NULL # Using where; Using index for group-by
1 SIMPLE t2 range NULL idx_t2_1 146 NULL # Using where; Using index for group-by
explain select distinct a1,a2,b,c from t2 where (a2 >= 'b') and (b = 'a') and (c = 'i121') group by a1,a2,b;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t2 range idx_t2_1,idx_t2_2 idx_t2_1 163 NULL # Using where; Using index for group-by
1 SIMPLE t2 range NULL idx_t2_1 163 NULL # Using where; Using index for group-by
explain select distinct a1,a2,b from t2 where (a1 > 'a') and (a2 > 'a') and (b = 'c') group by a1,a2,b;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t2 range idx_t2_0,idx_t2_1,idx_t2_2 idx_t2_1 146 NULL # Using where; Using index for group-by
explain select distinct b from t2 where (a2 >= 'b') and (b = 'a') group by a1,a2,b;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t2 range idx_t2_1,idx_t2_2 idx_t2_1 146 NULL # Using where; Using index for group-by; Using temporary; Using filesort
1 SIMPLE t2 range NULL idx_t2_1 146 NULL # Using where; Using index for group-by; Using temporary; Using filesort
explain select distinct a1 from t2 where a1 in ('a', 'd') and a2 = 'b' group by a1;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t2 range idx_t2_0,idx_t2_1,idx_t2_2 idx_t2_1 129 NULL # Using where; Using index for group-by
......@@ -2064,23 +2082,23 @@ select distinct a1 from t2 where a1 in ('a', 'd') and a2 = 'e' group by a1;
a1
explain select count(distinct a1,a2,b) from t1 where (a2 >= 'b') and (b = 'a');
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 range idx_t1_1,idx_t1_2 idx_t1_1 147 NULL 501 Using where; Using index for group-by (scanning)
1 SIMPLE t1 range NULL idx_t1_1 147 NULL 251 Using where; Using index for group-by
explain select count(distinct a1,a2,b,c) from t1 where (a2 >= 'b') and (b = 'a') and (c = 'i121');
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 range idx_t1_1 idx_t1_1 163 NULL 1001 Using where; Using index for group-by (scanning)
1 SIMPLE t1 range NULL idx_t1_1 163 NULL 501 Using where; Using index for group-by (scanning)
explain extended select count(distinct a1,a2,b) from t1 where (a1 > 'a') and (a2 > 'a') and (b = 'c');
id select_type table type possible_keys key key_len ref rows filtered Extra
1 SIMPLE t1 range idx_t1_0,idx_t1_1,idx_t1_2 idx_t1_1 147 NULL 501 100.00 Using where; Using index for group-by (scanning)
1 SIMPLE t1 range idx_t1_0,idx_t1_1,idx_t1_2 idx_t1_1 147 NULL 251 100.00 Using where; Using index for group-by
Warnings:
Note 1003 /* select#1 */ select count(distinct `test`.`t1`.`a1`,`test`.`t1`.`a2`,`test`.`t1`.`b`) AS `count(distinct a1,a2,b)` from `test`.`t1` where ((`test`.`t1`.`b` = 'c') and (`test`.`t1`.`a1` > 'a') and (`test`.`t1`.`a2` > 'a'))
Note 1003 select count(distinct `test`.`t1`.`a1`,`test`.`t1`.`a2`,`test`.`t1`.`b`) AS `count(distinct a1,a2,b)` from `test`.`t1` where `test`.`t1`.`b` = 'c' and `test`.`t1`.`a1` > 'a' and `test`.`t1`.`a2` > 'a'
explain select count(distinct b) from t1 where (a2 >= 'b') and (b = 'a');
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 index idx_t1_1,idx_t1_2 idx_t1_2 147 NULL 1000 Using where; Using index
1 SIMPLE t1 index NULL idx_t1_2 147 NULL 1000 Using where; Using index
explain extended select 98 + count(distinct a1,a2,b) from t1 where (a1 > 'a') and (a2 > 'a');
id select_type table type possible_keys key key_len ref rows filtered Extra
1 SIMPLE t1 range idx_t1_0,idx_t1_1,idx_t1_2 idx_t1_1 147 NULL 501 100.00 Using where; Using index for group-by (scanning)
1 SIMPLE t1 range idx_t1_0,idx_t1_1,idx_t1_2 idx_t1_1 147 NULL 251 100.00 Using where; Using index for group-by
Warnings:
Note 1003 /* select#1 */ select (98 + count(distinct `test`.`t1`.`a1`,`test`.`t1`.`a2`,`test`.`t1`.`b`)) AS `98 + count(distinct a1,a2,b)` from `test`.`t1` where ((`test`.`t1`.`a1` > 'a') and (`test`.`t1`.`a2` > 'a'))
Note 1003 select 98 + count(distinct `test`.`t1`.`a1`,`test`.`t1`.`a2`,`test`.`t1`.`b`) AS `98 + count(distinct a1,a2,b)` from `test`.`t1` where `test`.`t1`.`a1` > 'a' and `test`.`t1`.`a2` > 'a'
select count(distinct a1,a2,b) from t1 where (a2 >= 'b') and (b = 'a');
count(distinct a1,a2,b)
4
......@@ -2098,19 +2116,19 @@ select 98 + count(distinct a1,a2,b) from t1 where (a1 > 'a') and (a2 > 'a');
104
explain select a1,a2,b, concat(min(c), max(c)) from t1 where a1 < 'd' group by a1,a2,b;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 range idx_t1_0,idx_t1_1,idx_t1_2 idx_t1_1 147 NULL 501 Using where; Using index for group-by
1 SIMPLE t1 range idx_t1_0,idx_t1_1,idx_t1_2 idx_t1_1 147 NULL 251 Using where; Using index for group-by
explain select concat(a1,min(c)),b from t1 where a1 < 'd' group by a1,a2,b;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 range idx_t1_0,idx_t1_1,idx_t1_2 idx_t1_1 147 NULL 501 Using where; Using index for group-by
1 SIMPLE t1 range idx_t1_0,idx_t1_1,idx_t1_2 idx_t1_1 147 NULL 251 Using where; Using index for group-by
explain select concat(a1,min(c)),b,max(c) from t1 where a1 < 'd' group by a1,a2,b;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 range idx_t1_0,idx_t1_1,idx_t1_2 idx_t1_1 147 NULL 501 Using where; Using index for group-by
1 SIMPLE t1 range idx_t1_0,idx_t1_1,idx_t1_2 idx_t1_1 147 NULL 251 Using where; Using index for group-by
explain select concat(a1,a2),b,min(c),max(c) from t1 where a1 < 'd' group by a1,a2,b;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 range idx_t1_0,idx_t1_1,idx_t1_2 idx_t1_1 147 NULL 501 Using where; Using index for group-by
1 SIMPLE t1 range idx_t1_0,idx_t1_1,idx_t1_2 idx_t1_1 147 NULL 251 Using where; Using index for group-by
explain select concat(ord(min(b)),ord(max(b))),min(b),max(b) from t1 group by a1,a2;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 range idx_t1_1,idx_t1_2 idx_t1_1 147 NULL 251 Using index for group-by
1 SIMPLE t1 range NULL idx_t1_1 147 NULL 126 Using index for group-by
select a1,a2,b, concat(min(c), max(c)) from t1 where a1 < 'd' group by a1,a2,b;
a1 a2 b concat(min(c), max(c))
a a a a111d111
......@@ -2179,85 +2197,83 @@ concat(ord(min(b)),ord(max(b))) min(b) max(b)
9798 a b
explain select a1,a2,b,d,min(c),max(c) from t1 group by a1,a2,b;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 index idx_t1_1,idx_t1_2 idx_t1_2 147 NULL 1000 NULL
1 SIMPLE t1 index NULL idx_t1_2 147 NULL 1000
explain select a1,a2,b,d from t1 group by a1,a2,b;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 index idx_t1_1,idx_t1_2 idx_t1_2 147 NULL 1000 NULL
1 SIMPLE t1 index NULL idx_t1_2 147 NULL 1000
explain extended select a1,a2,min(b),max(b) from t1
where (a1 = 'b' or a1 = 'd' or a1 = 'a' or a1 = 'c') and (a2 > 'a') and (c > 'a111') group by a1,a2;
id select_type table type possible_keys key key_len ref rows filtered Extra
1 SIMPLE t1 index idx_t1_0,idx_t1_1,idx_t1_2 idx_t1_1 163 NULL 1000 100.00 Using where; Using index
Warnings:
Note 1003 /* select#1 */ select `test`.`t1`.`a1` AS `a1`,`test`.`t1`.`a2` AS `a2`,min(`test`.`t1`.`b`) AS `min(b)`,max(`test`.`t1`.`b`) AS `max(b)` from `test`.`t1` where (((`test`.`t1`.`a1` = 'b') or (`test`.`t1`.`a1` = 'd') or (`test`.`t1`.`a1` = 'a') or (`test`.`t1`.`a1` = 'c')) and (`test`.`t1`.`a2` > 'a') and (`test`.`t1`.`c` > 'a111')) group by `test`.`t1`.`a1`,`test`.`t1`.`a2`
Note 1003 select `test`.`t1`.`a1` AS `a1`,`test`.`t1`.`a2` AS `a2`,min(`test`.`t1`.`b`) AS `min(b)`,max(`test`.`t1`.`b`) AS `max(b)` from `test`.`t1` where (`test`.`t1`.`a1` = 'b' or `test`.`t1`.`a1` = 'd' or `test`.`t1`.`a1` = 'a' or `test`.`t1`.`a1` = 'c') and `test`.`t1`.`a2` > 'a' and `test`.`t1`.`c` > 'a111' group by `test`.`t1`.`a1`,`test`.`t1`.`a2`
explain extended select a1,a2,b,min(c),max(c) from t1
where (a1 = 'b' or a1 = 'd' or a1 = 'a' or a1 = 'c') and (a2 > 'a') and (d > 'xy2') group by a1,a2,b;
id select_type table type possible_keys key key_len ref rows filtered Extra
1 SIMPLE t1 index idx_t1_0,idx_t1_1,idx_t1_2 idx_t1_2 147 NULL 1000 100.00 Using where
Warnings:
Note 1003 /* select#1 */ select `test`.`t1`.`a1` AS `a1`,`test`.`t1`.`a2` AS `a2`,`test`.`t1`.`b` AS `b`,min(`test`.`t1`.`c`) AS `min(c)`,max(`test`.`t1`.`c`) AS `max(c)` from `test`.`t1` where (((`test`.`t1`.`a1` = 'b') or (`test`.`t1`.`a1` = 'd') or (`test`.`t1`.`a1` = 'a') or (`test`.`t1`.`a1` = 'c')) and (`test`.`t1`.`a2` > 'a') and (`test`.`t1`.`d` > 'xy2')) group by `test`.`t1`.`a1`,`test`.`t1`.`a2`,`test`.`t1`.`b`
Note 1003 select `test`.`t1`.`a1` AS `a1`,`test`.`t1`.`a2` AS `a2`,`test`.`t1`.`b` AS `b`,min(`test`.`t1`.`c`) AS `min(c)`,max(`test`.`t1`.`c`) AS `max(c)` from `test`.`t1` where (`test`.`t1`.`a1` = 'b' or `test`.`t1`.`a1` = 'd' or `test`.`t1`.`a1` = 'a' or `test`.`t1`.`a1` = 'c') and `test`.`t1`.`a2` > 'a' and `test`.`t1`.`d` > 'xy2' group by `test`.`t1`.`a1`,`test`.`t1`.`a2`,`test`.`t1`.`b`
explain extended select a1,a2,b,c from t1
where (a1 = 'b' or a1 = 'd' or a1 = 'a' or a1 = 'c') and (a2 > 'a') and (d > 'xy2') group by a1,a2,b,c;
id select_type table type possible_keys key key_len ref rows filtered Extra
1 SIMPLE t1 index idx_t1_0,idx_t1_1,idx_t1_2 idx_t1_1 163 NULL 1000 100.00 Using where
Warnings:
Note 1003 /* select#1 */ select `test`.`t1`.`a1` AS `a1`,`test`.`t1`.`a2` AS `a2`,`test`.`t1`.`b` AS `b`,`test`.`t1`.`c` AS `c` from `test`.`t1` where (((`test`.`t1`.`a1` = 'b') or (`test`.`t1`.`a1` = 'd') or (`test`.`t1`.`a1` = 'a') or (`test`.`t1`.`a1` = 'c')) and (`test`.`t1`.`a2` > 'a') and (`test`.`t1`.`d` > 'xy2')) group by `test`.`t1`.`a1`,`test`.`t1`.`a2`,`test`.`t1`.`b`,`test`.`t1`.`c`
Note 1003 select `test`.`t1`.`a1` AS `a1`,`test`.`t1`.`a2` AS `a2`,`test`.`t1`.`b` AS `b`,`test`.`t1`.`c` AS `c` from `test`.`t1` where (`test`.`t1`.`a1` = 'b' or `test`.`t1`.`a1` = 'd' or `test`.`t1`.`a1` = 'a' or `test`.`t1`.`a1` = 'c') and `test`.`t1`.`a2` > 'a' and `test`.`t1`.`d` > 'xy2' group by `test`.`t1`.`a1`,`test`.`t1`.`a2`,`test`.`t1`.`b`,`test`.`t1`.`c`
explain select a1,a2,b,max(c),min(c) from t2 where (a2 = 'a') and (b = 'b') or (b < 'b') group by a1;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t2 index idx_t2_0,idx_t2_1,idx_t2_2 idx_t2_0 65 NULL 1000 Using where
1 SIMPLE t2 index NULL idx_t2_1 163 NULL 1000 Using where; Using index
explain select a1,a2,b,max(c),min(c) from t2 where (a2 = 'a') and (b < 'b') group by a1;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t2 index idx_t2_0,idx_t2_1,idx_t2_2 idx_t2_0 65 NULL 1000 Using where
1 SIMPLE t2 index NULL idx_t2_1 163 NULL 1000 Using where; Using index
explain select a1,a2,b,max(c),min(c) from t2 where (a2 = 'a') and (b <= 'b') group by a1;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t2 index idx_t2_0,idx_t2_1,idx_t2_2 idx_t2_0 65 NULL 1000 Using where
1 SIMPLE t2 index NULL idx_t2_1 163 NULL 1000 Using where; Using index
explain select a1,a2,b,max(c),min(c) from t2 where (a2 = 'a') and (b <= 'b' and b >= 'a') group by a1;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t2 index idx_t2_0,idx_t2_1,idx_t2_2 idx_t2_0 65 NULL 1000 Using where
1 SIMPLE t2 index NULL idx_t2_1 163 NULL 1000 Using where; Using index
explain extended select a1,a2,b from t1 where (a1 = 'b' or a1 = 'd' or a1 = 'a' or a1 = 'c') and (a2 > 'a') and (c > 'a111') group by a1,a2,b;
id select_type table type possible_keys key key_len ref rows filtered Extra
1 SIMPLE t1 index idx_t1_0,idx_t1_1,idx_t1_2 idx_t1_1 163 NULL 1000 100.00 Using where; Using index
Warnings:
Note 1003 /* select#1 */ select `test`.`t1`.`a1` AS `a1`,`test`.`t1`.`a2` AS `a2`,`test`.`t1`.`b` AS `b` from `test`.`t1` where (((`test`.`t1`.`a1` = 'b') or (`test`.`t1`.`a1` = 'd') or (`test`.`t1`.`a1` = 'a') or (`test`.`t1`.`a1` = 'c')) and (`test`.`t1`.`a2` > 'a') and (`test`.`t1`.`c` > 'a111')) group by `test`.`t1`.`a1`,`test`.`t1`.`a2`,`test`.`t1`.`b`
Note 1003 select `test`.`t1`.`a1` AS `a1`,`test`.`t1`.`a2` AS `a2`,`test`.`t1`.`b` AS `b` from `test`.`t1` where (`test`.`t1`.`a1` = 'b' or `test`.`t1`.`a1` = 'd' or `test`.`t1`.`a1` = 'a' or `test`.`t1`.`a1` = 'c') and `test`.`t1`.`a2` > 'a' and `test`.`t1`.`c` > 'a111' group by `test`.`t1`.`a1`,`test`.`t1`.`a2`,`test`.`t1`.`b`
explain select a1,a2,min(b),c from t2 where (a2 = 'a') and (c = 'a111') group by a1;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t2 index idx_t2_0,idx_t2_1,idx_t2_2 idx_t2_0 65 NULL 1000 Using where
1 SIMPLE t2 index NULL idx_t2_1 163 NULL 1000 Using where; Using index
select a1,a2,min(b),c from t2 where (a2 = 'a') and (c = 'a111') group by a1;
a1 a2 min(b) c
a a a a111
explain select a1,a2,b,max(c),min(c) from t2 where (a2 = 'a') and (b = 'b') or (b = 'a') group by a1;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t2 index idx_t2_0,idx_t2_1,idx_t2_2 idx_t2_0 65 NULL 1000 Using where
1 SIMPLE t2 index NULL idx_t2_1 163 NULL 1000 Using where; Using index
explain select a1,a2,b,min(c),max(c) from t2
where (c > 'a000') and (c <= 'd999') and (c like '_8__') group by a1,a2,b;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t2 index idx_t2_1,idx_t2_2 idx_t2_1 163 NULL 1000 Using where; Using index
1 SIMPLE t2 index NULL idx_t2_1 163 NULL 1000 Using where; Using index
explain select a1, a2, b, c, min(d), max(d) from t1 group by a1,a2,b,c;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 index idx_t1_1 idx_t1_1 163 NULL 1000 NULL
1 SIMPLE t1 index NULL idx_t1_1 163 NULL 1000
explain select a1,a2,count(a2) from t1 group by a1,a2,b;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 index idx_t1_1,idx_t1_2 idx_t1_2 147 NULL 1000 Using index
1 SIMPLE t1 index NULL idx_t1_2 147 NULL 1000 Using index
explain extended select a1,a2,count(a2) from t1 where (a1 > 'a') group by a1,a2,b;
id select_type table type possible_keys key key_len ref rows filtered Extra
1 SIMPLE t1 index idx_t1_0,idx_t1_1,idx_t1_2 idx_t1_2 147 NULL 1000 100.00 Using where; Using index
Warnings:
Note 1003 /* select#1 */ select `test`.`t1`.`a1` AS `a1`,`test`.`t1`.`a2` AS `a2`,count(`test`.`t1`.`a2`) AS `count(a2)` from `test`.`t1` where (`test`.`t1`.`a1` > 'a') group by `test`.`t1`.`a1`,`test`.`t1`.`a2`,`test`.`t1`.`b`
Note 1003 select `test`.`t1`.`a1` AS `a1`,`test`.`t1`.`a2` AS `a2`,count(`test`.`t1`.`a2`) AS `count(a2)` from `test`.`t1` where `test`.`t1`.`a1` > 'a' group by `test`.`t1`.`a1`,`test`.`t1`.`a2`,`test`.`t1`.`b`
explain extended select sum(ord(a1)) from t1 where (a1 > 'a') group by a1,a2,b;
id select_type table type possible_keys key key_len ref rows filtered Extra
1 SIMPLE t1 index idx_t1_0,idx_t1_1,idx_t1_2 idx_t1_2 147 NULL 1000 100.00 Using where; Using index
Warnings:
Note 1003 /* select#1 */ select sum(ord(`test`.`t1`.`a1`)) AS `sum(ord(a1))` from `test`.`t1` where (`test`.`t1`.`a1` > 'a') group by `test`.`t1`.`a1`,`test`.`t1`.`a2`,`test`.`t1`.`b`
set optimizer_switch = 'multi_range_groupby=off';
Note 1003 select sum(ord(`test`.`t1`.`a1`)) AS `sum(ord(a1))` from `test`.`t1` where `test`.`t1`.`a1` > 'a' group by `test`.`t1`.`a1`,`test`.`t1`.`a2`,`test`.`t1`.`b`
explain select a1,a2,b,max(c),min(c) from t2 where (a2 = 'a') and (b = 'a' or b = 'b') group by a1;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t2 index idx_t2_0,idx_t2_1,idx_t2_2 idx_t2_0 65 NULL 1000 Using where
set optimizer_switch = 'default';
1 SIMPLE t2 index NULL idx_t2_1 163 NULL 1000 Using where; Using index
explain select a1,a2,b,max(c),min(c) from t2 where (a2 = 'a') and (b = 'a' or b = 'b') group by a1;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t2 range idx_t2_0,idx_t2_1,idx_t2_2 idx_t2_1 163 NULL 126 Using where; Using index for group-by
1 SIMPLE t2 index NULL idx_t2_1 163 NULL 1000 Using where; Using index
explain select distinct(a1) from t1 where ord(a2) = 98;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 index idx_t1_0,idx_t1_1,idx_t1_2 idx_t1_0 65 NULL 1000 Using where
1 SIMPLE t1 index NULL idx_t1_2 147 NULL 1000 Using where; Using index
select distinct(a1) from t1 where ord(a2) = 98;
a1
a
......@@ -2266,7 +2282,7 @@ c
d
explain select a1 from t1 where a2 = 'b' group by a1;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 range idx_t1_0,idx_t1_1,idx_t1_2 idx_t1_1 130 NULL 126 Using where; Using index for group-by
1 SIMPLE t1 range NULL idx_t1_1 130 NULL 63 Using where; Using index for group-by
select a1 from t1 where a2 = 'b' group by a1;
a1
a
......@@ -2275,7 +2291,7 @@ c
d
explain select distinct a1 from t1 where a2 = 'b';
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 range idx_t1_0,idx_t1_1,idx_t1_2 idx_t1_1 130 NULL 126 Using where; Using index for group-by
1 SIMPLE t1 range NULL idx_t1_1 130 NULL 63 Using where; Using index for group-by
select distinct a1 from t1 where a2 = 'b';
a1
a
......@@ -2385,7 +2401,7 @@ INSERT INTO t1 (a) VALUES
('SOUTH EAST'), ('SOUTH WEST'), ('WESTERN');
EXPLAIN SELECT DISTINCT a,a FROM t1 ORDER BY a;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 range PRIMARY PRIMARY 66 NULL 1001 Using index for group-by
1 SIMPLE t1 index NULL PRIMARY 66 NULL 1000 Using index
SELECT DISTINCT a,a FROM t1 ORDER BY a;
a a
......@@ -2477,7 +2493,7 @@ Table Op Msg_type Msg_text
test.t1 analyze status OK
EXPLAIN SELECT max(b), a FROM t1 GROUP BY a;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 range a a 5 NULL 501 Using index for group-by
1 SIMPLE t1 range NULL a 5 NULL 251 Using index for group-by
FLUSH STATUS;
SELECT max(b), a FROM t1 GROUP BY a;
max(b) a
......@@ -2489,15 +2505,17 @@ SHOW STATUS LIKE 'handler_read__e%';
Variable_name Value
Handler_read_key 8
Handler_read_next 0
Handler_read_retry 0
EXPLAIN SELECT max(b), a FROM t1 GROUP BY a;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 range a a 5 NULL 501 Using index for group-by
1 SIMPLE t1 range NULL a 5 NULL 251 Using index for group-by
FLUSH STATUS;
CREATE TABLE t2 engine=RocksDB SELECT max(b), a FROM t1 GROUP BY a;
SHOW STATUS LIKE 'handler_read__e%';
Variable_name Value
Handler_read_key 8
Handler_read_next 0
Handler_read_retry 0
FLUSH STATUS;
SELECT * FROM (SELECT max(b), a FROM t1 GROUP BY a) b;
max(b) a
......@@ -2509,6 +2527,7 @@ SHOW STATUS LIKE 'handler_read__e%';
Variable_name Value
Handler_read_key 8
Handler_read_next 0
Handler_read_retry 0
FLUSH STATUS;
(SELECT max(b), a FROM t1 GROUP BY a) UNION
(SELECT max(b), a FROM t1 GROUP BY a);
......@@ -2521,50 +2540,52 @@ SHOW STATUS LIKE 'handler_read__e%';
Variable_name Value
Handler_read_key 16
Handler_read_next 0
Handler_read_retry 0
EXPLAIN (SELECT max(b), a FROM t1 GROUP BY a) UNION
(SELECT max(b), a FROM t1 GROUP BY a);
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY t1 range a a 5 NULL 501 Using index for group-by
2 UNION t1 range a a 5 NULL 501 Using index for group-by
NULL UNION RESULT <union1,2> ALL NULL NULL NULL NULL NULL Using temporary
1 PRIMARY t1 range NULL a 5 NULL 251 Using index for group-by
2 UNION t1 range NULL a 5 NULL 251 Using index for group-by
NULL UNION RESULT <union1,2> ALL NULL NULL NULL NULL NULL
EXPLAIN SELECT (SELECT max(b) FROM t1 GROUP BY a HAVING a < 2) x
FROM t1 AS t1_outer;
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY t1_outer index NULL a 10 NULL 1000 Using index
2 SUBQUERY t1 range a a 5 NULL 501 Using index for group-by
2 SUBQUERY t1 range NULL a 5 NULL 251 Using index for group-by
EXPLAIN SELECT 1 FROM t1 AS t1_outer WHERE EXISTS
(SELECT max(b) FROM t1 GROUP BY a HAVING a < 2);
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY t1_outer index NULL a 10 NULL 1000 Using index
2 SUBQUERY t1 range a a 5 NULL 501 Using index for group-by
2 SUBQUERY t1 index NULL a 10 NULL 1000 Using index
EXPLAIN SELECT 1 FROM t1 AS t1_outer WHERE
(SELECT max(b) FROM t1 GROUP BY a HAVING a < 2) > 12;
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY NULL NULL NULL NULL NULL NULL NULL Impossible WHERE
2 SUBQUERY t1 range a a 5 NULL 501 Using index for group-by
1 PRIMARY t1_outer index NULL a 10 NULL 1000 Using index
2 SUBQUERY t1 range NULL a 5 NULL 251 Using index for group-by
EXPLAIN SELECT 1 FROM t1 AS t1_outer WHERE
a IN (SELECT max(b) FROM t1 GROUP BY a HAVING a < 2);
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY t1_outer index NULL a 10 NULL 1000 Using where; Using index
2 SUBQUERY t1 range a a 5 NULL 501 Using index for group-by
1 PRIMARY <subquery2> ALL distinct_key NULL NULL NULL 251
1 PRIMARY t1_outer ref a a 5 <subquery2>.max(b) 4 Using index
2 MATERIALIZED t1 range NULL a 5 NULL 251 Using index for group-by
EXPLAIN SELECT 1 FROM t1 AS t1_outer GROUP BY a HAVING
a > (SELECT max(b) FROM t1 GROUP BY a HAVING a < 2);
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY t1_outer range a a 5 NULL 501 Using index for group-by
2 SUBQUERY t1 range a a 5 NULL 501 Using index for group-by
1 PRIMARY t1_outer range NULL a 5 NULL 251 Using index for group-by
2 SUBQUERY t1 range NULL a 5 NULL 251 Using index for group-by
EXPLAIN SELECT 1 FROM t1 AS t1_outer1 JOIN t1 AS t1_outer2
ON t1_outer1.a = (SELECT max(b) FROM t1 GROUP BY a HAVING a < 2)
AND t1_outer1.b = t1_outer2.b;
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY t1_outer2 index NULL a 10 NULL 1000 Using where; Using index
1 PRIMARY t1_outer1 ref a a 10 const,test.t1_outer2.b 1 Using where; Using index
2 SUBQUERY t1 range a a 5 NULL 501 Using index for group-by
1 PRIMARY t1_outer1 ref a a 5 const 4 Using where; Using index
1 PRIMARY t1_outer2 index NULL a 10 NULL 1000 Using where; Using index; Using join buffer (flat, BNL join)
2 SUBQUERY t1 range NULL a 5 NULL 251 Using index for group-by
EXPLAIN SELECT (SELECT (SELECT max(b) FROM t1 GROUP BY a HAVING a < 2) x
FROM t1 AS t1_outer) x2 FROM t1 AS t1_outer2;
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY t1_outer2 index NULL a 10 NULL 1000 Using index
2 SUBQUERY t1_outer index NULL a 10 NULL 1000 Using index
3 SUBQUERY t1 range a a 5 NULL 501 Using index for group-by
3 SUBQUERY t1 range NULL a 5 NULL 251 Using index for group-by
CREATE TABLE t3 LIKE t1;
FLUSH STATUS;
INSERT INTO t3 SELECT a,MAX(b) FROM t1 GROUP BY a;
......@@ -2572,6 +2593,7 @@ SHOW STATUS LIKE 'handler_read__e%';
Variable_name Value
Handler_read_key 8
Handler_read_next 0
Handler_read_retry 0
DELETE FROM t3;
FLUSH STATUS;
INSERT INTO t3 SELECT 1, (SELECT MAX(b) FROM t1 GROUP BY a HAVING a < 2)
......@@ -2580,12 +2602,14 @@ SHOW STATUS LIKE 'handler_read__e%';
Variable_name Value
Handler_read_key 8
Handler_read_next 0
Handler_read_retry 0
FLUSH STATUS;
DELETE FROM t3 WHERE (SELECT MAX(b) FROM t1 GROUP BY a HAVING a < 2) > 10000;
SHOW STATUS LIKE 'handler_read__e%';
Variable_name Value
Handler_read_key 8
Handler_read_next 0
Handler_read_retry 0
FLUSH STATUS;
DELETE FROM t3 WHERE (SELECT (SELECT MAX(b) FROM t1 GROUP BY a HAVING a < 2) x
FROM t1) > 10000;
......@@ -2594,6 +2618,7 @@ SHOW STATUS LIKE 'handler_read__e%';
Variable_name Value
Handler_read_key 8
Handler_read_next 1
Handler_read_retry 0
DROP TABLE t1,t2,t3;
CREATE TABLE t1 (a int, INDEX idx(a)) engine=RocksDB;
INSERT INTO t1 VALUES
......@@ -2604,7 +2629,7 @@ Table Op Msg_type Msg_text
test.t1 analyze status OK
EXPLAIN SELECT DISTINCT(a) FROM t1;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 range idx idx 5 NULL 1001 Using index for group-by
1 SIMPLE t1 range NULL idx 5 NULL 501 Using index for group-by
SELECT DISTINCT(a) FROM t1;
a
1
......@@ -2612,7 +2637,7 @@ a
4
EXPLAIN SELECT SQL_BIG_RESULT DISTINCT(a) FROM t1;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 range idx idx 5 NULL 1001 Using index for group-by
1 SIMPLE t1 range NULL idx 5 NULL 501 Using index for group-by
SELECT SQL_BIG_RESULT DISTINCT(a) FROM t1;
a
1
......@@ -2640,7 +2665,7 @@ CREATE INDEX break_it ON t1 (a, b);
EXPLAIN
SELECT a, MIN(b), MAX(b) FROM t1 GROUP BY a ORDER BY a;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 range break_it break_it 10 NULL 501 Using index for group-by
1 SIMPLE t1 range NULL break_it 10 NULL 251 Using index for group-by
SELECT a, MIN(b), MAX(b) FROM t1 GROUP BY a ORDER BY a;
a MIN(b) MAX(b)
1 1 3
......@@ -2650,7 +2675,7 @@ a MIN(b) MAX(b)
EXPLAIN
SELECT a, MIN(b), MAX(b) FROM t1 GROUP BY a ORDER BY a DESC;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 range break_it break_it 10 NULL 501 Using index for group-by; Using temporary; Using filesort
1 SIMPLE t1 range NULL break_it 10 NULL 251 Using index for group-by; Using temporary; Using filesort
SELECT a, MIN(b), MAX(b) FROM t1 GROUP BY a ORDER BY a DESC;
a MIN(b) MAX(b)
4 1 3
......@@ -2660,7 +2685,7 @@ a MIN(b) MAX(b)
EXPLAIN
SELECT a, MIN(b), MAX(b), AVG(b) FROM t1 GROUP BY a ORDER BY a DESC;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 index break_it break_it 10 NULL 1000 Using index
1 SIMPLE t1 index NULL break_it 10 NULL 1000 Using index
SELECT a, MIN(b), MAX(b), AVG(b) FROM t1 GROUP BY a ORDER BY a DESC;
a MIN(b) MAX(b) AVG(b)
4 1 3 2.0000
......@@ -2743,9 +2768,9 @@ a b
3 13
explain extended select sql_buffer_result a, max(b)+1 from t1 where a = 0 group by a;
id select_type table type possible_keys key key_len ref rows filtered Extra
1 SIMPLE t1 range PRIMARY,index PRIMARY 4 NULL 1 100.00 Using where; Using index for group-by; Using temporary
1 SIMPLE t1 ref PRIMARY,index PRIMARY 4 const 15 100.00 Using index; Using temporary
Warnings:
Note 1003 /* select#1 */ select sql_buffer_result `test`.`t1`.`a` AS `a`,(max(`test`.`t1`.`b`) + 1) AS `max(b)+1` from `test`.`t1` where (`test`.`t1`.`a` = 0) group by `test`.`t1`.`a`
Note 1003 select sql_buffer_result `test`.`t1`.`a` AS `a`,max(`test`.`t1`.`b`) + 1 AS `max(b)+1` from `test`.`t1` where `test`.`t1`.`a` = 0 group by `test`.`t1`.`a`
drop table t1;
CREATE TABLE t1 (a int, b int, c int, d int,
KEY foo (c,d,a,b), KEY bar (c,a,b,d)) engine=RocksDB;
......@@ -2758,7 +2783,7 @@ Table Op Msg_type Msg_text
test.t1 analyze status OK
EXPLAIN SELECT DISTINCT c FROM t1 WHERE d=4;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 range foo,bar foo 10 NULL 126 Using where; Using index for group-by
1 SIMPLE t1 range NULL foo 10 NULL 63 Using where; Using index for group-by
SELECT DISTINCT c FROM t1 WHERE d=4;
c
1
......@@ -2780,7 +2805,7 @@ test.t analyze status OK
EXPLAIN
SELECT a, MIN(b) FROM t WHERE b <> 0 GROUP BY a;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t range a a 10 NULL 501 Using where; Using index for group-by
1 SIMPLE t range NULL a 10 NULL 251 Using where; Using index for group-by
#should return 1 row
SELECT a, MIN(b) FROM t WHERE b <> 0 GROUP BY a;
a MIN(b)
......@@ -2790,7 +2815,7 @@ a MIN(b)
EXPLAIN
SELECT a, MAX(b) FROM t WHERE b <> 1 GROUP BY a;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t range a a 10 NULL 501 Using where; Using index for group-by
1 SIMPLE t range NULL a 10 NULL 251 Using where; Using index for group-by
#should return 1 row
SELECT a, MAX(b) FROM t WHERE b <> 1 GROUP BY a;
a MAX(b)
......@@ -2801,7 +2826,7 @@ INSERT INTO t SELECT a, 2 FROM t;
EXPLAIN
SELECT a, MAX(b) FROM t WHERE b > 0 AND b < 2 GROUP BY a;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t range a a 10 NULL 501 Using where; Using index for group-by
1 SIMPLE t range NULL a 10 NULL 251 Using where; Using index for group-by
#should return 1 row
SELECT a, MAX(b) FROM t WHERE b > 0 AND b < 2 GROUP BY a;
a MAX(b)
......@@ -2915,7 +2940,7 @@ NULL
EXPLAIN
SELECT MIN( a ) FROM t1 WHERE a = (SELECT a FROM t1 WHERE a < 0);
id select_type table type possible_keys key key_len ref rows Extra
x x x x x x x x x Impossible WHERE noticed after reading const tables
x x x x x x x x x Using where; Using index
x x x x x x x x x Using where; Using index
SELECT MIN( a ) FROM t1 WHERE a = (SELECT a FROM t1 WHERE a < 0);
MIN( a )
......@@ -2990,7 +3015,7 @@ NULL
EXPLAIN
SELECT MIN( a ) FROM t1 WHERE a = (SELECT a FROM t1 WHERE a < 0);
id select_type table type possible_keys key key_len ref rows Extra
x x x x x x x x x Impossible WHERE noticed after reading const tables
x x x x x x x x x Using where; Using index
x x x x x x x x x Using where; Using index
SELECT MIN( a ) FROM t1 WHERE a = (SELECT a FROM t1 WHERE a < 0);
MIN( a )
......@@ -3072,7 +3097,7 @@ NULL
EXPLAIN
SELECT MIN( a ) FROM t1 WHERE a = (SELECT a FROM t1 WHERE a < 0);
id select_type table type possible_keys key key_len ref rows Extra
x x x x x x x x x Impossible WHERE noticed after reading const tables
x x x x x x x x x Using where; Using index
x x x x x x x x x Using where; Using index
SELECT MIN( a ) FROM t1 WHERE a = (SELECT a FROM t1 WHERE a < 0);
MIN( a )
......@@ -3119,45 +3144,45 @@ Table Op Msg_type Msg_text
test.t2 analyze status OK
EXPLAIN SELECT COUNT(DISTINCT a) FROM t1;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 range a a 5 NULL 501 Using index for group-by
1 SIMPLE t1 range NULL a 5 NULL 251 Using index for group-by
SELECT COUNT(DISTINCT a) FROM t1;
COUNT(DISTINCT a)
2
EXPLAIN SELECT COUNT(DISTINCT a,b) FROM t1;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 range a a 10 NULL 1001 Using index for group-by (scanning)
1 SIMPLE t1 range NULL a 10 NULL 501 Using index for group-by
SELECT COUNT(DISTINCT a,b) FROM t1;
COUNT(DISTINCT a,b)
16
EXPLAIN SELECT COUNT(DISTINCT b,a) FROM t1;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 range a a 10 NULL 1001 Using index for group-by (scanning)
1 SIMPLE t1 range NULL a 10 NULL 501 Using index for group-by
SELECT COUNT(DISTINCT b,a) FROM t1;
COUNT(DISTINCT b,a)
16
EXPLAIN SELECT COUNT(DISTINCT b) FROM t1;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 index a a 10 NULL 1000 Using index
1 SIMPLE t1 index NULL a 10 NULL 1000 Using index
SELECT COUNT(DISTINCT b) FROM t1;
COUNT(DISTINCT b)
8
EXPLAIN SELECT COUNT(DISTINCT a) FROM t1 GROUP BY a;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 range a a 5 NULL 501 Using index for group-by
1 SIMPLE t1 range NULL a 5 NULL 251 Using index for group-by
SELECT COUNT(DISTINCT a) FROM t1 GROUP BY a;
COUNT(DISTINCT a)
1
1
EXPLAIN SELECT COUNT(DISTINCT b) FROM t1 GROUP BY a;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 range a a 10 NULL 1001 Using index for group-by (scanning)
1 SIMPLE t1 range NULL a 10 NULL 501 Using index for group-by
SELECT COUNT(DISTINCT b) FROM t1 GROUP BY a;
COUNT(DISTINCT b)
8
8
EXPLAIN SELECT COUNT(DISTINCT a) FROM t1 GROUP BY b;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 index a a 10 NULL 1000 Using index; Using filesort
1 SIMPLE t1 index NULL a 10 NULL 1000 Using index; Using filesort
SELECT COUNT(DISTINCT a) FROM t1 GROUP BY b;
COUNT(DISTINCT a)
2
......@@ -3170,7 +3195,7 @@ COUNT(DISTINCT a)
2
EXPLAIN SELECT DISTINCT COUNT(DISTINCT a) FROM t1;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 index a a 10 NULL 1000 Using index
1 SIMPLE t1 index NULL a 10 NULL 1000 Using index
SELECT DISTINCT COUNT(DISTINCT a) FROM t1;
COUNT(DISTINCT a)
2
......@@ -3188,76 +3213,76 @@ COUNT(DISTINCT a)
2
EXPLAIN SELECT COUNT(DISTINCT a) FROM t1 HAVING COUNT(DISTINCT c) < 10;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 ALL NULL NULL NULL NULL 1000 NULL
1 SIMPLE t1 ALL NULL NULL NULL NULL 1000
SELECT COUNT(DISTINCT a) FROM t1 HAVING COUNT(DISTINCT c) < 10;
COUNT(DISTINCT a)
2
EXPLAIN SELECT 1 FROM t1 HAVING COUNT(DISTINCT a) < 10;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 range a a 5 NULL 501 Using index for group-by
1 SIMPLE t1 range NULL a 5 NULL 251 Using index for group-by
SELECT 1 FROM t1 HAVING COUNT(DISTINCT a) < 10;
1
1
EXPLAIN SELECT 1 FROM t1 GROUP BY a HAVING COUNT(DISTINCT b) > 1;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 range a a 10 NULL 1001 Using index for group-by (scanning)
1 SIMPLE t1 range NULL a 10 NULL 501 Using index for group-by
SELECT 1 FROM t1 GROUP BY a HAVING COUNT(DISTINCT b) > 1;
1
1
1
EXPLAIN SELECT COUNT(DISTINCT t1_1.a) FROM t1 t1_1, t1 t1_2 GROUP BY t1_1.a;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1_1 index a a 10 NULL 1000 Using index; Using temporary; Using filesort
1 SIMPLE t1_2 index NULL a 10 NULL 1000 Using index; Using join buffer (Block Nested Loop)
1 SIMPLE t1_1 index NULL a 10 NULL 1000 Using index; Using temporary; Using filesort
1 SIMPLE t1_2 index NULL a 10 NULL 1000 Using index; Using join buffer (flat, BNL join)
SELECT COUNT(DISTINCT t1_1.a) FROM t1 t1_1, t1 t1_2 GROUP BY t1_1.a;
COUNT(DISTINCT t1_1.a)
1
1
EXPLAIN SELECT COUNT(DISTINCT a), 12 FROM t1;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 range a a 5 NULL 501 Using index for group-by
1 SIMPLE t1 range NULL a 5 NULL 251 Using index for group-by
SELECT COUNT(DISTINCT a), 12 FROM t1;
COUNT(DISTINCT a) 12
2 12
EXPLAIN SELECT COUNT(DISTINCT a, b, c) FROM t2;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t2 range a a 15 NULL 1001 Using index for group-by (scanning)
1 SIMPLE t2 range NULL a 15 NULL 501 Using index for group-by
SELECT COUNT(DISTINCT a, b, c) FROM t2;
COUNT(DISTINCT a, b, c)
16
EXPLAIN SELECT COUNT(DISTINCT a), SUM(DISTINCT a), AVG(DISTINCT a) FROM t2;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t2 range a a 5 NULL 251 Using index for group-by
1 SIMPLE t2 range NULL a 5 NULL 126 Using index for group-by
SELECT COUNT(DISTINCT a), SUM(DISTINCT a), AVG(DISTINCT a) FROM t2;
COUNT(DISTINCT a) SUM(DISTINCT a) AVG(DISTINCT a)
2 3 1.5000
EXPLAIN SELECT COUNT(DISTINCT a), SUM(DISTINCT a), AVG(DISTINCT f) FROM t2;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t2 ALL NULL NULL NULL NULL 1000 NULL
1 SIMPLE t2 ALL NULL NULL NULL NULL 1000
SELECT COUNT(DISTINCT a), SUM(DISTINCT a), AVG(DISTINCT f) FROM t2;
COUNT(DISTINCT a) SUM(DISTINCT a) AVG(DISTINCT f)
2 3 1.0000
EXPLAIN SELECT COUNT(DISTINCT a, b), COUNT(DISTINCT b, a) FROM t2;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t2 range a a 10 NULL 501 Using index for group-by (scanning)
1 SIMPLE t2 range NULL a 10 NULL 251 Using index for group-by
SELECT COUNT(DISTINCT a, b), COUNT(DISTINCT b, a) FROM t2;
COUNT(DISTINCT a, b) COUNT(DISTINCT b, a)
16 16
EXPLAIN SELECT COUNT(DISTINCT a, b), COUNT(DISTINCT b, f) FROM t2;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t2 ALL NULL NULL NULL NULL 1000 NULL
1 SIMPLE t2 ALL NULL NULL NULL NULL 1000
SELECT COUNT(DISTINCT a, b), COUNT(DISTINCT b, f) FROM t2;
COUNT(DISTINCT a, b) COUNT(DISTINCT b, f)
16 8
EXPLAIN SELECT COUNT(DISTINCT a, b), COUNT(DISTINCT b, d) FROM t2;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t2 ALL NULL NULL NULL NULL 1000 NULL
1 SIMPLE t2 ALL NULL NULL NULL NULL 1000
SELECT COUNT(DISTINCT a, b), COUNT(DISTINCT b, d) FROM t2;
COUNT(DISTINCT a, b) COUNT(DISTINCT b, d)
16 8
EXPLAIN SELECT a, c, COUNT(DISTINCT c, a, b) FROM t2 GROUP BY a, b, c;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t2 range a a 15 NULL 1001 Using index for group-by (scanning)
1 SIMPLE t2 range NULL a 15 NULL 501 Using index for group-by
SELECT a, c, COUNT(DISTINCT c, a, b) FROM t2 GROUP BY a, b, c;
a c COUNT(DISTINCT c, a, b)
1 1 1
......@@ -3279,7 +3304,7 @@ a c COUNT(DISTINCT c, a, b)
EXPLAIN SELECT COUNT(DISTINCT c, a, b) FROM t2
WHERE a > 5 AND b BETWEEN 10 AND 20 GROUP BY a, b, c;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t2 range a a 15 NULL 1001 Using where; Using index for group-by (scanning)
1 SIMPLE t2 range a a 15 NULL 501 Using where; Using index for group-by
SELECT COUNT(DISTINCT c, a, b) FROM t2
WHERE a > 5 AND b BETWEEN 10 AND 20 GROUP BY a, b, c;
COUNT(DISTINCT c, a, b)
......@@ -3292,28 +3317,28 @@ GROUP BY b;
COUNT(DISTINCT b) SUM(DISTINCT b)
EXPLAIN SELECT a, COUNT(DISTINCT b), SUM(DISTINCT b) FROM t2 GROUP BY a;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t2 range a a 10 NULL 501 Using index for group-by (scanning)
1 SIMPLE t2 range NULL a 10 NULL 251 Using index for group-by
SELECT a, COUNT(DISTINCT b), SUM(DISTINCT b) FROM t2 GROUP BY a;
a COUNT(DISTINCT b) SUM(DISTINCT b)
1 8 36
2 8 36
EXPLAIN SELECT COUNT(DISTINCT b), SUM(DISTINCT b) FROM t2 GROUP BY a;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t2 range a a 10 NULL 501 Using index for group-by (scanning)
1 SIMPLE t2 range NULL a 10 NULL 251 Using index for group-by
SELECT COUNT(DISTINCT b), SUM(DISTINCT b) FROM t2 GROUP BY a;
COUNT(DISTINCT b) SUM(DISTINCT b)
8 36
8 36
EXPLAIN SELECT COUNT(DISTINCT a, b) FROM t2 WHERE c = 13 AND d = 42;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t2 ALL a NULL NULL NULL 1000 Using where
1 SIMPLE t2 ALL NULL NULL NULL NULL 1000 Using where
SELECT COUNT(DISTINCT a, b) FROM t2 WHERE c = 13 AND d = 42;
COUNT(DISTINCT a, b)
0
EXPLAIN SELECT a, COUNT(DISTINCT a), SUM(DISTINCT a) FROM t2
WHERE b = 13 AND c = 42 GROUP BY a;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t2 range a a 15 NULL 251 Using where; Using index for group-by
1 SIMPLE t2 range NULL a 15 NULL 126 Using where; Using index for group-by
SELECT a, COUNT(DISTINCT a), SUM(DISTINCT a) FROM t2
WHERE b = 13 AND c = 42 GROUP BY a;
a COUNT(DISTINCT a) SUM(DISTINCT a)
......@@ -3327,14 +3352,14 @@ COUNT(DISTINCT a, b) SUM(DISTINCT a)
0 NULL
EXPLAIN SELECT SUM(DISTINCT a), MAX(b) FROM t2 GROUP BY a;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t2 index a a 15 NULL 1000 Using index
1 SIMPLE t2 index NULL a 15 NULL 1000 Using index
SELECT SUM(DISTINCT a), MAX(b) FROM t2 GROUP BY a;
SUM(DISTINCT a) MAX(b)
1 8
2 8
EXPLAIN SELECT 42 * (a + c + COUNT(DISTINCT c, a, b)) FROM t2 GROUP BY a, b, c;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t2 range a a 15 NULL 1001 Using index for group-by (scanning)
1 SIMPLE t2 range NULL a 15 NULL 501 Using index for group-by
SELECT 42 * (a + c + COUNT(DISTINCT c, a, b)) FROM t2 GROUP BY a, b, c;
42 * (a + c + COUNT(DISTINCT c, a, b))
126
......@@ -3355,7 +3380,7 @@ SELECT 42 * (a + c + COUNT(DISTINCT c, a, b)) FROM t2 GROUP BY a, b, c;
168
EXPLAIN SELECT (SUM(DISTINCT a) + MAX(b)) FROM t2 GROUP BY a;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t2 index a a 15 NULL 1000 Using index
1 SIMPLE t2 index NULL a 15 NULL 1000 Using index
SELECT (SUM(DISTINCT a) + MAX(b)) FROM t2 GROUP BY a;
(SUM(DISTINCT a) + MAX(b))
9
......@@ -3383,7 +3408,7 @@ f1 COUNT(DISTINCT f2)
3 4
explain SELECT f1, COUNT(DISTINCT f2) FROM t1 GROUP BY f1;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 index PRIMARY PRIMARY 5 NULL 1000 Using index
1 SIMPLE t1 index NULL PRIMARY 5 NULL 1000 Using index
drop table t1;
# End of test#50539.
#
......@@ -3395,9 +3420,6 @@ INSERT INTO t VALUES (1,1), (2,2), (3,3), (4,4), (1,0), (3,2), (4,5);
ANALYZE TABLE t;
Table Op Msg_type Msg_text
test.t analyze status OK
set optimizer_trace_max_mem_size=1048576;
set @@session.optimizer_trace='enabled=on';
set end_markers_in_json=on;
ANALYZE TABLE t;
Table Op Msg_type Msg_text
test.t analyze status OK
......@@ -3409,11 +3431,7 @@ a SUM(DISTINCT a) MIN(b)
4 4 4
EXPLAIN SELECT a, SUM(DISTINCT a), MIN(b) FROM t GROUP BY a;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t index a a 10 NULL 1000 Using index
SELECT TRACE RLIKE 'have_both_agg_distinct_and_min_max' AS OK
FROM INFORMATION_SCHEMA.OPTIMIZER_TRACE;
OK
1
1 SIMPLE t index NULL a 10 NULL 1000 Using index
SELECT a, SUM(DISTINCT a), MAX(b) FROM t GROUP BY a;
a SUM(DISTINCT a) MAX(b)
1 1 1
......@@ -3422,11 +3440,7 @@ a SUM(DISTINCT a) MAX(b)
4 4 5
EXPLAIN SELECT a, SUM(DISTINCT a), MAX(b) FROM t GROUP BY a;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t index a a 10 NULL 1000 Using index
SELECT TRACE RLIKE 'have_both_agg_distinct_and_min_max' AS OK
FROM INFORMATION_SCHEMA.OPTIMIZER_TRACE;
OK
1
1 SIMPLE t index NULL a 10 NULL 1000 Using index
SELECT a, MAX(b) FROM t GROUP BY a HAVING SUM(DISTINCT a);
a MAX(b)
1 1
......@@ -3435,21 +3449,13 @@ a MAX(b)
4 5
EXPLAIN SELECT a, MAX(b) FROM t GROUP BY a HAVING SUM(DISTINCT a);
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t index a a 10 NULL 1000 Using index
SELECT TRACE RLIKE 'have_both_agg_distinct_and_min_max' AS OK
FROM INFORMATION_SCHEMA.OPTIMIZER_TRACE;
OK
1
1 SIMPLE t index NULL a 10 NULL 1000 Using index
SELECT SUM(DISTINCT a), MIN(b), MAX(b) FROM t;
SUM(DISTINCT a) MIN(b) MAX(b)
10 0 5
EXPLAIN SELECT SUM(DISTINCT a), MIN(b), MAX(b) FROM t;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t index a a 10 NULL 1000 Using index
SELECT TRACE RLIKE 'have_both_agg_distinct_and_min_max' AS OK
FROM INFORMATION_SCHEMA.OPTIMIZER_TRACE;
OK
1
1 SIMPLE t index NULL a 10 NULL 1000 Using index
SELECT a, SUM(DISTINCT a), MIN(b), MAX(b) FROM t GROUP BY a;
a SUM(DISTINCT a) MIN(b) MAX(b)
1 1 0 1
......@@ -3458,14 +3464,7 @@ a SUM(DISTINCT a) MIN(b) MAX(b)
4 4 4 5
EXPLAIN SELECT a, SUM(DISTINCT a), MIN(b), MAX(b) FROM t GROUP BY a;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t index a a 10 NULL 1000 Using index
SELECT TRACE RLIKE 'have_both_agg_distinct_and_min_max' AS OK
FROM INFORMATION_SCHEMA.OPTIMIZER_TRACE;
OK
1
SET optimizer_trace_max_mem_size=DEFAULT;
SET optimizer_trace=DEFAULT;
SET end_markers_in_json=DEFAULT;
1 SIMPLE t index NULL a 10 NULL 1000 Using index
DROP TABLE t;
#
# Bug#18109609: LOOSE INDEX SCAN IS NOT USED WHEN IT SHOULD
......@@ -3484,7 +3483,7 @@ Table Op Msg_type Msg_text
test.t1 analyze status OK
EXPLAIN SELECT MAX(c2), c1 FROM t1 WHERE c1 = 4 GROUP BY c1;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 range c1 c1 5 NULL 251 Using where; Using index for group-by
1 SIMPLE t1 ref c1 c1 5 const 1000 Using index
FLUSH STATUS;
SELECT MAX(c2), c1 FROM t1 WHERE c1 = 4 GROUP BY c1;
MAX(c2) c1
......@@ -3492,12 +3491,14 @@ MAX(c2) c1
SHOW SESSION STATUS LIKE 'Handler_read%';
Variable_name Value
Handler_read_first 0
Handler_read_key 3
Handler_read_last 1
Handler_read_next 0
Handler_read_key 1
Handler_read_last 0
Handler_read_next 20
Handler_read_prev 0
Handler_read_retry 0
Handler_read_rnd 0
Handler_read_rnd_deleted 0
Handler_read_rnd_next 0
DROP TABLE t1;
# End of test for Bug#18109609
set global debug="-d,force_group_by";
set global debug_dbug=@debug_tmp;
storage/rocksdb/mysql-test/rocksdb/t/group_min_max.test
View file @ 638fa95e
--source include/have_debug.inc
set global debug="+d,force_group_by";
set @debug_tmp= @@debug_dbug;
set global debug_dbug="+d,force_group_by";
let $engine=RocksDB;
--source include/group_min_max.inc
set global debug="-d,force_group_by";
set global debug_dbug=@debug_tmp;
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