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Commit b034267f authored by unknown's avatar unknown
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Merge mhansson@bk-internal:/home/bk/mysql-5.1-opt 

into  dl145s.mysql.com:/data0/mhansson/my51-bug30665


sql/sql_select.cc:
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parents 2cfd44fd 5a177308
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Showing with 493 additions and 2 deletions
mysql-test/r/group_by.result
View file @ b034267f
......@@ -1096,7 +1096,153 @@ id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 index NULL PRIMARY 4 NULL 144 Using index; Using filesort
EXPLAIN SELECT a FROM t1 IGNORE INDEX FOR ORDER BY (PRIMARY,i2) ORDER BY a;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 index NULL PRIMARY 4 NULL 144 Using index; Using filesort
1 SIMPLE t1 index NULL PRIMARY 4 NULL 144 Using index
SELECT a FROM t1 IGNORE INDEX FOR ORDER BY (PRIMARY,i2) ORDER BY a;
a
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EXPLAIN SELECT a FROM t1 IGNORE INDEX FOR ORDER BY (PRIMARY)
IGNORE INDEX FOR GROUP BY (i2) GROUP BY a;
id select_type table type possible_keys key key_len ref rows Extra
......
mysql-test/r/order_by.result
View file @ b034267f
......@@ -1131,3 +1131,288 @@ id c3
186 14
196 14
DROP TABLE t1,t2;
CREATE TABLE t1 (
a INT,
b INT,
PRIMARY KEY (a),
KEY ab(a, b)
);
INSERT INTO t1 VALUES (1,1),(2,2),(3,3),(4,4);
INSERT INTO t1 SELECT a + 4, b + 4 FROM t1;
INSERT INTO t1 SELECT a + 8, b + 8 FROM t1;
INSERT INTO t1 SELECT a +16, b +16 FROM t1;
INSERT INTO t1 SELECT a +32, b +32 FROM t1;
INSERT INTO t1 SELECT a +64, b +64 FROM t1;
EXPLAIN SELECT a FROM t1 IGNORE INDEX FOR GROUP BY (a, ab) GROUP BY a;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 range NULL ab 4 NULL 10 Using index for group-by
SELECT a FROM t1 IGNORE INDEX FOR GROUP BY (a, ab) GROUP BY a;
a
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SELECT @tmp_tables_after = @tmp_tables_before ;
@tmp_tables_after = @tmp_tables_before
1
EXPLAIN SELECT a FROM t1 IGNORE INDEX FOR ORDER BY (a, ab) ORDER BY a;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 index NULL PRIMARY 4 NULL 128 Using index
SELECT a FROM t1 IGNORE INDEX FOR ORDER BY (a, ab) ORDER BY a;
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SELECT @tmp_tables_after = @tmp_tables_before;
@tmp_tables_after = @tmp_tables_before
1
DROP TABLE t1;
mysql-test/t/group_by.test
View file @ b034267f
......@@ -811,6 +811,7 @@ EXPLAIN SELECT a FROM t1 IGNORE INDEX (PRIMARY,i2);
EXPLAIN SELECT a FROM t1 IGNORE INDEX FOR JOIN (PRIMARY,i2);
EXPLAIN SELECT a FROM t1 IGNORE INDEX FOR GROUP BY (PRIMARY,i2) GROUP BY a;
EXPLAIN SELECT a FROM t1 IGNORE INDEX FOR ORDER BY (PRIMARY,i2) ORDER BY a;
SELECT a FROM t1 IGNORE INDEX FOR ORDER BY (PRIMARY,i2) ORDER BY a;
EXPLAIN SELECT a FROM t1 IGNORE INDEX FOR ORDER BY (PRIMARY)
IGNORE INDEX FOR GROUP BY (i2) GROUP BY a;
EXPLAIN SELECT a FROM t1 IGNORE INDEX (PRIMARY) IGNORE INDEX FOR ORDER BY (i2);
......
mysql-test/t/order_by.test
View file @ b034267f
......@@ -779,3 +779,60 @@ EXPLAIN SELECT id,c3 FROM t2 WHERE c2 BETWEEN 20 AND 30 ORDER BY c3 LIMIT 4000;
SELECT id,c3 FROM t2 WHERE c2=11 ORDER BY c3 LIMIT 20;
DROP TABLE t1,t2;
#
# Bug #30665: Inconsistent optimization of IGNORE INDEX FOR {ORDER BY|GROUP BY}
#
CREATE TABLE t1 (
a INT,
b INT,
PRIMARY KEY (a),
KEY ab(a, b)
);
INSERT INTO t1 VALUES (1,1),(2,2),(3,3),(4,4);
INSERT INTO t1 SELECT a + 4, b + 4 FROM t1;
INSERT INTO t1 SELECT a + 8, b + 8 FROM t1;
INSERT INTO t1 SELECT a +16, b +16 FROM t1;
INSERT INTO t1 SELECT a +32, b +32 FROM t1;
INSERT INTO t1 SELECT a +64, b +64 FROM t1;
EXPLAIN SELECT a FROM t1 IGNORE INDEX FOR GROUP BY (a, ab) GROUP BY a;
--disable_query_log
--let $q = `show status like 'Created_tmp_tables';`
eval set @tmp_tables_before =
CAST(REPLACE('$q', 'Created_tmp_tables', '') AS UNSIGNED);
--enable_query_log
SELECT a FROM t1 IGNORE INDEX FOR GROUP BY (a, ab) GROUP BY a;
# this query creates one temporary table in itself, which we are not
# interested in.
--disable_query_log
--let $q = `show status like 'Created_tmp_tables';`
eval set @tmp_tables_after =
CAST(REPLACE('$q', 'Created_tmp_tables', '') AS UNSIGNED);
--enable_query_log
SELECT @tmp_tables_after = @tmp_tables_before ;
EXPLAIN SELECT a FROM t1 IGNORE INDEX FOR ORDER BY (a, ab) ORDER BY a;
--disable_query_log
--let $q = `show status like 'Created_tmp_tables';`
eval set @tmp_tables_before =
CAST(REPLACE('$q', 'Created_tmp_tables', '') AS UNSIGNED);
--enable_query_log
SELECT a FROM t1 IGNORE INDEX FOR ORDER BY (a, ab) ORDER BY a;
--disable_query_log
--let $q = `show status like 'Created_tmp_tables';`
eval set @tmp_tables_after =
CAST(REPLACE('$q', 'Created_tmp_tables', '') AS UNSIGNED);
--enable_query_log
SELECT @tmp_tables_after = @tmp_tables_before;
DROP TABLE t1;
sql/sql_select.cc
View file @ b034267f
......@@ -1695,7 +1695,7 @@ JOIN::exec()
test_if_skip_sort_order(&join_tab[const_tables], order,
select_limit, 0,
&join_tab[const_tables].table->
keys_in_use_for_order_by))))
keys_in_use_for_query))))
order=0;
having= tmp_having;
select_describe(this, need_tmp,
......@@ -12614,6 +12614,8 @@ find_field_in_item_list (Field *field, void *data)
If we can use an index, the JOIN_TAB / tab->select struct
is changed to use the index.
The index must cover all fields in <order>, or it will not be considered.
Return:
0 We have to use filesort to do the sorting
1 We can use an index.
......
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