BUG#670417: Diverging results in maria-5.3-mwl128-dsmrr-cpk with join buffer, attempt 4

- Disable identical key handling optimization when
  IndexConditionPushdown is used

1 files changed, 45 insertions, 0 deletions

diff --git a/mysql-test/r/myisam_mrr.result b/mysql-test/r/myisam_mrr.result
index 467a643571b..8befb17e5ac 100644
--- a/mysql-test/r/myisam_mrr.result
+++ b/mysql-test/r/myisam_mrr.result
@@ -462,3 +462,48 @@ FROM t1
 WHERE `key1` LIKE CONCAT( LEFT( '1' , 7 ) , '%' )
 ORDER BY col1 LIMIT 7;
 drop table t0, t1, t2;
+#
+# BUG#670417: Diverging results in maria-5.3-mwl128-dsmrr-cpk with join buffer (incremental, BKA join)
+#
+set @save_join_cache_level = @@join_cache_level;
+set join_cache_level = 6;
+set @save_join_buffer_size=@@join_buffer_size;
+set join_buffer_size = 136;
+CREATE TABLE t1 (
+pk int(11) NOT NULL AUTO_INCREMENT,
+col_int_key int(11) NOT NULL,
+col_varchar_key varchar(1) NOT NULL,
+col_varchar_nokey varchar(1) NOT NULL,
+PRIMARY KEY (pk),
+KEY col_varchar_key (col_varchar_key,col_int_key)
+);
+INSERT INTO t1 VALUES 
+(10,8,'v','v'),(11,8,'f','f'), (12,5,'v','v'),
+(13,8,'s','s'),(14,8,'a','a'),(15,6,'p','p'),
+(16,7,'z','z'),(17,2,'a','a'),(18,5,'h','h'),
+(19,7,'h','h'),(20,2,'v','v'),(21,9,'v','v'),
+(22,142,'b','b'),(23,3,'y','y'),(24,0,'v','v'),
+(25,3,'m','m'),(26,5,'z','z'),(27,9,'n','n'),
+(28,1,'d','d'),(29,107,'a','a');
+SELECT COUNT(*) 
+FROM 
+t1 AS table2, t1 AS table3 
+where 
+table3.col_varchar_key = table2.col_varchar_key AND 
+table3.col_varchar_key = table2.col_varchar_nokey AND 
+table3.pk<>0;
+COUNT(*)
+50
+EXPLAIN SELECT COUNT(*) 
+FROM 
+t1 AS table2, t1 AS table3 
+where 
+table3.col_varchar_key = table2.col_varchar_key AND 
+table3.col_varchar_key = table2.col_varchar_nokey AND 
+table3.pk<>0;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	table2	ALL	col_varchar_key	NULL	NULL	NULL	20	Using where
+1	SIMPLE	table3	ref	PRIMARY,col_varchar_key	col_varchar_key	3	test.table2.col_varchar_key	3	Using index condition(BKA); Using where; Using join buffer (flat, BKA join)
+set join_cache_level= @save_join_cache_level;
+set join_buffer_size= @save_join_buffer_size;
+drop table t1;