BUG20733: Bug in partition pruning with zerofill field

Problem was with handling NULL values in ranges


mysql-test/r/partition_hash.result:
  New partition pruning test cases
mysql-test/r/partition_list.result:
  New partition pruning test cases
mysql-test/r/partition_pruning.result:
  New partition pruning test cases
mysql-test/r/partition_range.result:
  New partition pruning test cases
mysql-test/t/partition_hash.test:
  New partition pruning test cases
mysql-test/t/partition_list.test:
  New partition pruning test cases
mysql-test/t/partition_pruning.test:
  New partition pruning test cases
mysql-test/t/partition_range.test:
  New partition pruning test cases
sql/opt_range.cc:
  Added comment
sql/sql_partition.cc:
  Partition pruning didn't handle ranges with NULL values in a proper manner

1 files changed, 78 insertions, 0 deletions

diff --git a/mysql-test/r/partition_pruning.result b/mysql-test/r/partition_pruning.result
index ee294242bf7..bf7888bfd99 100644
--- a/mysql-test/r/partition_pruning.result
+++ b/mysql-test/r/partition_pruning.result
@@ -149,6 +149,48 @@ id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
 explain partitions select * from t6 where a > 3 and a < 5;
 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 t6;
+create table t6 (a int unsigned not null) partition by LIST(a) (
+partition p1 values in (1),
+partition p3 values in (3),
+partition p5 values in (5),
+partition p7 values in (7),
+partition p9 values in (9)
+);
+insert into t6 values (1),(3),(5);
+explain partitions select * from t6 where a <  1;
+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 t6 where a <= 1;
+id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t6	p1	system	NULL	NULL	NULL	NULL	1	
+explain partitions select * from t6 where a >  9;
+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 t6 where a >= 9;
+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 t6 where a > 0 and a < 5;
+id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t6	p1,p3	ALL	NULL	NULL	NULL	NULL	2	Using where
+explain partitions select * from t6 where a > 5 and a < 12;
+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 t6 where a > 3 and a < 8 ;
+id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t6	p5,p7	system	NULL	NULL	NULL	NULL	1	
+explain partitions select * from t6 where a >= 0 and a <= 5;
+id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t6	p1,p3,p5	ALL	NULL	NULL	NULL	NULL	3	Using where
+explain partitions select * from t6 where a >= 5 and a <= 12;
+id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t6	p5,p7,p9	system	NULL	NULL	NULL	NULL	1	
+explain partitions select * from t6 where a >= 3 and a <= 8;
+id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t6	p3,p5,p7	ALL	NULL	NULL	NULL	NULL	2	Using where
+explain partitions select * from t6 where a > 3 and a < 5;
+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
 create table t7 (a int not null) partition by RANGE(a) (
 partition p10 values less than (10),
 partition p30 values less than (30),
@@ -184,6 +226,42 @@ id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
 explain partitions select * from t7 where a > 11 and a < 29;
 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 t7;
+create table t7 (a int unsigned not null) partition by RANGE(a) (
+partition p10 values less than (10),
+partition p30 values less than (30),
+partition p50 values less than (50),
+partition p70 values less than (70),
+partition p90 values less than (90)
+);
+insert into t7 values (10),(30),(50);
+explain partitions select * from t7 where a < 5;
+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 t7 where a < 10;
+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 t7 where a <= 10;
+id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t7	p10,p30	system	NULL	NULL	NULL	NULL	1	
+explain partitions select * from t7 where a = 10;
+id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t7	p30	system	NULL	NULL	NULL	NULL	1	
+explain partitions select * from t7 where a < 90;
+id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t7	p10,p30,p50,p70,p90	ALL	NULL	NULL	NULL	NULL	3	Using where
+explain partitions select * from t7 where a = 90;
+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 t7 where a > 90;
+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 t7 where a >= 90;
+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 t7 where a > 11 and a < 29;
+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
 create table t8 (a date not null) partition by RANGE(YEAR(a)) (
 partition p0 values less than (1980),
 partition p1 values less than (1990),