Merge epotemkin@bk-internal.mysql.com:/home/bk/mysql-5.1

into  sunlight.local:/local_work/tmp_merge-5.1-opt-mysql

mysql-test/r/partition_pruning.result

@@ -775,3 +775,89 @@ ref	NULL
 rows	2
 Extra	
 drop table t2;
+create table t1 (s1 int);
+explain partitions select 1 from t1 union all select 2;
+id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
+1	PRIMARY	t1	NULL	system	NULL	NULL	NULL	NULL	0	const row not found
+2	UNION	NULL	NULL	NULL	NULL	NULL	NULL	NULL	NULL	No tables used
+NULL	UNION RESULT	<union1,2>	NULL	ALL	NULL	NULL	NULL	NULL	NULL	
+drop table t1;
+create table t1 (a bigint unsigned not null) partition by range(a) (
+partition p0 values less than (10),
+partition p1 values less than (100),
+partition p2 values less than (1000),
+partition p3 values less than (18446744073709551000),
+partition p4 values less than (18446744073709551614)
+);
+insert into t1 values (5),(15),(105),(1005);
+insert into t1 values (18446744073709551000+1);
+insert into t1 values (18446744073709551614-1);
+explain partitions select * from t1 where a < 10;
+id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t1	p0	system	NULL	NULL	NULL	NULL	1	
+explain partitions select * from t1 
+where a >= 18446744073709551000-1 and a <= 18446744073709551000+1;
+id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t1	p3,p4	ALL	NULL	NULL	NULL	NULL	3	Using where
+explain partitions select * from t1 
+where a between 18446744073709551001 and 18446744073709551002;
+id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t1	p4	ALL	NULL	NULL	NULL	NULL	2	Using where
+explain partitions select * from t1 where a = 18446744073709551000;
+id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t1	p4	ALL	NULL	NULL	NULL	NULL	2	Using where
+explain partitions select * from t1 where a = 18446744073709551613;
+id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t1	p4	ALL	NULL	NULL	NULL	NULL	2	Using where
+explain partitions select * from t1 where a = 18446744073709551614;
+id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	NULL	NULL	NULL	NULL	NULL	NULL	NULL	NULL	Impossible WHERE noticed after reading const tables
+drop table t1;
+create table t1 (a int) 
+partition by range((a & 0xFF) << 56) (
+partition p0 values less than (0x40 << 56),
+partition p1 values less than (0x80 << 56),
+partition p2 values less than (0xFF << 56)
+);
+insert into t1 values (0x20), (0x20), (0x41), (0x41), (0xFE), (0xFE);
+explain partitions select * from t1 where a=0;
+id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t1	p0	ALL	NULL	NULL	NULL	NULL	2	Using where
+explain partitions select * from t1 where a=0xFE;
+id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t1	p2	ALL	NULL	NULL	NULL	NULL	2	Using where
+explain partitions select * from t1 where a>0xFE and a<= 0xFF;
+id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	NULL	NULL	NULL	NULL	NULL	NULL	NULL	NULL	Impossible WHERE noticed after reading const tables
+drop table t1;
+create table t1(a bigint unsigned not null) partition by range(a+0) (
+partition p1 values less than (10),
+partition p2 values less than (20),
+partition p3 values less than (2305561538531885056),
+partition p4 values less than (2305561538531950591)
+);
+insert into t1 values (9),(19),(0xFFFF0000FFFF000-1), (0xFFFF0000FFFFFFF-1);
+insert into t1 values (9),(19),(0xFFFF0000FFFF000-1), (0xFFFF0000FFFFFFF-1);
+explain partitions select * from t1 where 
+a >= 2305561538531885056-10 and a <= 2305561538531885056-8;
+id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t1	p3	ALL	NULL	NULL	NULL	NULL	4	Using where
+explain partitions select * from t1 where 
+a > 0xFFFFFFFFFFFFFFEC and a < 0xFFFFFFFFFFFFFFEE;
+id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	NULL	NULL	NULL	NULL	NULL	NULL	NULL	NULL	Impossible WHERE noticed after reading const tables
+explain partitions select * from t1 where a>=0 and a <= 0xFFFFFFFFFFFFFFFF;
+id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t1	p1,p2,p3,p4	ALL	NULL	NULL	NULL	NULL	8	Using where
+drop table t1;
+create table t1 (a bigint) partition by range(a+0) (
+partition p1 values less than (-1000),
+partition p2 values less than (-10),
+partition p3 values less than (10),
+partition p4 values less than (1000)
+);
+insert into t1 values (-15),(-5),(5),(15),(-15),(-5),(5),(15);
+explain partitions select * from t1 where a>-2 and a <=0;
+id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t1	p3	ALL	NULL	NULL	NULL	NULL	4	Using where
+drop table t1;

mysql-test/t/partition_pruning.test

@@ -642,3 +642,76 @@ explain partitions select * from t2;
 --horizontal_results
 drop table t2;
 
+
+# BUG#20484 "Partitions: crash with explain and union"
+create table t1 (s1 int);
+explain partitions select 1 from t1 union all select 2;
+drop table t1;
+
+
+# BUG#20257: partition pruning test coverage for BIGINT UNSIGNED
+create table t1 (a bigint unsigned not null) partition by range(a) (
+  partition p0 values less than (10),
+  partition p1 values less than (100),
+  partition p2 values less than (1000),
+  partition p3 values less than (18446744073709551000),
+  partition p4 values less than (18446744073709551614)
+);
+insert into t1 values (5),(15),(105),(1005);
+insert into t1 values (18446744073709551000+1);
+insert into t1 values (18446744073709551614-1);
+
+explain partitions select * from t1 where a < 10;
+explain partitions select * from t1 
+  where a >= 18446744073709551000-1 and a <= 18446744073709551000+1;
+
+explain partitions select * from t1 
+  where a between 18446744073709551001 and 18446744073709551002;
+
+explain partitions select * from t1 where a = 18446744073709551000;
+explain partitions select * from t1 where a = 18446744073709551613;
+explain partitions select * from t1 where a = 18446744073709551614;
+drop table t1;
+
+create table t1 (a int) 
+  partition by range((a & 0xFF) << 56) (
+  partition p0 values less than (0x40 << 56),
+  partition p1 values less than (0x80 << 56),
+  partition p2 values less than (0xFF << 56)
+);
+
+insert into t1 values (0x20), (0x20), (0x41), (0x41), (0xFE), (0xFE); 
+explain partitions select * from t1 where a=0;
+explain partitions select * from t1 where a=0xFE;
+explain partitions select * from t1 where a>0xFE and a<= 0xFF;
+drop table t1;
+
+create table t1(a bigint unsigned not null) partition by range(a+0) (
+  partition p1 values less than (10),
+  partition p2 values less than (20),
+  partition p3 values less than (2305561538531885056),
+  partition p4 values less than (2305561538531950591)
+);
+
+insert into t1 values (9),(19),(0xFFFF0000FFFF000-1), (0xFFFF0000FFFFFFF-1);
+insert into t1 values (9),(19),(0xFFFF0000FFFF000-1), (0xFFFF0000FFFFFFF-1);
+
+explain partitions select * from t1 where 
+  a >= 2305561538531885056-10 and a <= 2305561538531885056-8;
+
+explain partitions select * from t1 where 
+  a > 0xFFFFFFFFFFFFFFEC and a < 0xFFFFFFFFFFFFFFEE;
+
+explain partitions select * from t1 where a>=0 and a <= 0xFFFFFFFFFFFFFFFF;
+drop table t1;
+
+create table t1 (a bigint) partition by range(a+0) (
+  partition p1 values less than (-1000),
+  partition p2 values less than (-10),
+  partition p3 values less than (10),
+  partition p4 values less than (1000)
+);
+insert into t1 values (-15),(-5),(5),(15),(-15),(-5),(5),(15);
+explain partitions select * from t1 where a>-2 and a <=0;
+drop table t1;
+

sql/sql_partition.cc

@@ -6577,10 +6577,19 @@ int get_part_iter_for_interval_via_walking(partition_info *part_info,
   
   store_key_image_to_rec(field, max_value, len);
   b= field->val_int();
+  
+  /* 
+    Handle a special case where the distance between interval bounds is 
+    exactly 4G-1. This interval is too big for range walking, and if it is an
+    (x,y]-type interval then the following "b +=..." code will convert it to 
+    an empty interval by "wrapping around" a + 4G-1 + 1 = a. 
+  */
+  if ((ulonglong)b - (ulonglong)a == ~0ULL)
+    return -1;
 
   a += test(flags & NEAR_MIN);
   b += test(!(flags & NEAR_MAX));
-  uint n_values= b - a;
+  ulonglong n_values= b - a;
   
   if (n_values > total_parts || n_values > MAX_RANGE_TO_WALK)
     return -1;
@@ -6684,7 +6693,8 @@ static uint32 get_next_partition_via_walking(PARTITION_ITERATOR *part_iter)
   while (part_iter->field_vals.cur != part_iter->field_vals.end)
   {
     longlong dummy;
-    field->store(part_iter->field_vals.cur++, FALSE);
+    field->store(part_iter->field_vals.cur++,
+                 ((Field_num*)field)->unsigned_flag);
     if (part_iter->part_info->is_sub_partitioned() &&
         !part_iter->part_info->get_part_partition_id(part_iter->part_info,
                                                      &part_id, &dummy) ||
@@ -6692,8 +6702,6 @@ static uint32 get_next_partition_via_walking(PARTITION_ITERATOR *part_iter)
                                                 &part_id, &dummy))
       return part_id;
   }
-  //psergey-todo: return partition(part_func(NULL)) here...
-  
   part_iter->field_vals.cur= part_iter->field_vals.start;
   return NOT_A_PARTITION_ID;
 }

sql/sql_select.cc

@@ -14114,6 +14114,9 @@ static void select_describe(JOIN *join, bool need_tmp_table, bool need_order,
       }
       item_list.push_back(new Item_string(table_name_buffer, len, cs));
     }
+    /* partitions */
+    if (join->thd->lex->describe & DESCRIBE_PARTITIONS)
+      item_list.push_back(item_null);
     /* type */
     item_list.push_back(new Item_string(join_type_str[JT_ALL],
 					  strlen(join_type_str[JT_ALL]),