MDEV-10765: Wrong result - query does not retrieve values from defaul…

…t partition on a table partitioned by list columns

Partial matches should be treat as not exact one.

mysql-test/r/partition_default.result

@@ -1149,3 +1149,58 @@ t1	CREATE TABLE `t1` (
  PARTITION p2 VALUES IN ((1,4),(2,5),(3,6)) ENGINE = MyISAM,
  PARTITION p1 VALUES IN ((1,1),(0,0)) ENGINE = MyISAM) */
 drop table t1;
+#
+# MDEV-10765: Wrong result - query does not retrieve values from
+# default partition on a table partitioned by list columns
+#
+create table t1 (i int, j int) partition by list columns(i,j) (partition p1 values in ((10,10)), partition p2 default);
+insert into t1 values (10,1);
+select * from t1 where i = 10;
+i	j
+10	1
+explain partitions
+select * from t1 where i = 10;
+id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t1	p1,p2	system	NULL	NULL	NULL	NULL	1	
+select * from t1 where i = 10 and j=1;
+i	j
+10	1
+explain partitions
+select * from t1 where i = 10 and j=1;
+id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t1	p2	system	NULL	NULL	NULL	NULL	1	
+insert into t1 values (10,10);
+select * from t1 where i = 10 and j=10;
+i	j
+10	10
+explain partitions
+select * from t1 where i = 10 and j=10;
+id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t1	p1	system	NULL	NULL	NULL	NULL	1	
+drop table t1;
+create table t1
+( 
+a int not null,
+b int not null,
+c int
+)
+partition by list columns(a,b) 
+(
+partition p1 values in ((10,10)), 
+partition p2 values in ((10,20)), 
+partition p3 values in ((10,30)),
+partition p4 values in ((10,40)), 
+partition p5 values in ((10,50)) 
+);
+insert into t1 values 
+(10,10,1234), 
+(10,20,1234), 
+(10,30,1234),
+(10,40,1234), 
+(10,50,1234);
+explain partitions 
+select * from t1 
+where a>=10  and (a <=10 and b <=30);
+id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t1	p1,p2,p3	ALL	NULL	NULL	NULL	NULL	3	Using where
+drop table t1;

mysql-test/t/partition_default.test

@@ -453,3 +453,50 @@ create table t1 (a int, b int)
 show create table t1;
 
 drop table t1;
+
+--echo #
+--echo # MDEV-10765: Wrong result - query does not retrieve values from
+--echo # default partition on a table partitioned by list columns
+--echo #
+
+create table t1 (i int, j int) partition by list columns(i,j) (partition p1 values in ((10,10)), partition p2 default);
+insert into t1 values (10,1);
+select * from t1 where i = 10;
+explain partitions
+select * from t1 where i = 10;
+select * from t1 where i = 10 and j=1;
+explain partitions
+select * from t1 where i = 10 and j=1;
+insert into t1 values (10,10);
+select * from t1 where i = 10 and j=10;
+explain partitions
+select * from t1 where i = 10 and j=10;
+drop table t1;
+
+create table t1
+( 
+  a int not null,
+  b int not null,
+  c int
+)
+partition by list columns(a,b) 
+(
+  partition p1 values in ((10,10)), 
+  partition p2 values in ((10,20)), 
+  partition p3 values in ((10,30)),
+  partition p4 values in ((10,40)), 
+  partition p5 values in ((10,50)) 
+);
+
+insert into t1 values 
+  (10,10,1234), 
+  (10,20,1234), 
+  (10,30,1234),
+  (10,40,1234), 
+  (10,50,1234);
+
+explain partitions 
+select * from t1 
+where a>=10  and (a <=10 and b <=30);
+
+drop table t1;

sql/sql_partition.cc

@@ -7723,6 +7723,7 @@ int get_part_iter_for_interval_cols_via_map(partition_info *part_info,
   bool can_match_multiple_values;
   uint32 nparts;
   get_col_endpoint_func  UNINIT_VAR(get_col_endpoint);
+  uint full_length= 0;
   DBUG_ENTER("get_part_iter_for_interval_cols_via_map");
 
   if (part_info->part_type == RANGE_PARTITION)
@@ -7740,9 +7741,14 @@ int get_part_iter_for_interval_cols_via_map(partition_info *part_info,
   else
     assert(0);
 
+  for (uint32 i= 0; i < part_info->num_columns; i++)
+    full_length+= store_length_array[i];
+
   can_match_multiple_values= ((flags &
                                (NO_MIN_RANGE | NO_MAX_RANGE | NEAR_MIN |
                                 NEAR_MAX)) ||
+                              (min_len != max_len) ||
+                              (min_len != full_length) ||
                               memcmp(min_value, max_value, min_len));
   DBUG_ASSERT(can_match_multiple_values || (flags & EQ_RANGE) || flags == 0);
   if (can_match_multiple_values && part_info->has_default_partititon())