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, 30 insertions, 0 deletions

diff --git a/mysql-test/t/partition_hash.test b/mysql-test/t/partition_hash.test
index 8494de98371..3304f30fb1a 100644
--- a/mysql-test/t/partition_hash.test
+++ b/mysql-test/t/partition_hash.test
@@ -10,6 +10,36 @@ drop table if exists t1;
 --enable_warnings
 
 #
+# More partition pruning tests, especially on interval walking
+#
+create table t1 (a int unsigned)
+partition by hash(a div 2)
+partitions 4;
+insert into t1 values (null),(0),(1),(2),(3),(4),(5),(6),(7);
+select * from t1 where a < 0;
+select * from t1 where a is null or (a >= 5 and a <= 7);
+select * from t1 where a is null;
+select * from t1 where a is not null;
+select * from t1 where a >= 1 and a < 3;
+select * from t1 where a >= 3 and a <= 5;
+select * from t1 where a > 2 and a < 4;
+select * from t1 where a > 3 and a <= 6;
+select * from t1 where a > 5;
+select * from t1 where a >= 1 and a <= 5;
+explain partitions select * from t1 where a < 0;
+explain partitions select * from t1 where a is null or (a >= 5 and a <= 7); 
+explain partitions select * from t1 where a is null;
+explain partitions select * from t1 where a is not null;
+explain partitions select * from t1 where a >= 1 and a < 3;
+explain partitions select * from t1 where a >= 3 and a <= 5;
+explain partitions select * from t1 where a > 2 and a < 4;
+explain partitions select * from t1 where a > 3 and a <= 6;
+explain partitions select * from t1 where a > 5;
+explain partitions select * from t1 where a >= 1 and a <= 5;
+
+drop table t1;
+
+#
 # Partition by hash, basic
 #
 CREATE TABLE t1 (