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, 44 insertions, 0 deletions

diff --git a/mysql-test/t/partition_range.test b/mysql-test/t/partition_range.test
index 38142a9d485..670b9333ab9 100644
--- a/mysql-test/t/partition_range.test
+++ b/mysql-test/t/partition_range.test
@@ -10,6 +10,50 @@ drop table if exists t1;
 --enable_warnings
 
 #
+# More checks for partition pruning
+#
+create table t1 (a int unsigned)
+partition by range (a)
+(partition pnull values less than (0),
+ partition p0 values less than (1),
+ partition p1 values less than(2));
+insert into t1 values (null),(0),(1);
+
+select * from t1 where a is null;
+select * from t1 where a >= 0;
+select * from t1 where a < 0;
+select * from t1 where a <= 0;
+select * from t1 where a > 1;
+explain partitions select * from t1 where a is null;
+explain partitions select * from t1 where a >= 0;
+explain partitions select * from t1 where a < 0;
+explain partitions select * from t1 where a <= 0;
+explain partitions select * from t1 where a > 1;
+drop table t1;
+
+create table t1 (a int unsigned, b int unsigned)
+partition by range (a)
+subpartition by hash (b)
+subpartitions 2
+(partition pnull values less than (0),
+ partition p0 values less than (1),
+ partition p1 values less than(2));
+insert into t1 values (null,0),(null,1),(0,0),(0,1),(1,0),(1,1);
+
+select * from t1 where a is null;
+select * from t1 where a >= 0;
+select * from t1 where a < 0;
+select * from t1 where a <= 0;
+select * from t1 where a > 1;
+explain partitions select * from t1 where a is null;
+explain partitions select * from t1 where a >= 0;
+explain partitions select * from t1 where a < 0;
+explain partitions select * from t1 where a <= 0;
+explain partitions select * from t1 where a > 1;
+
+drop table t1;
+
+#
 # Partition by range, basic
 #
 CREATE TABLE t1 (