From 24a0a74f5d92a861989fcea17a0c62c1ee7b1299 Mon Sep 17 00:00:00 2001 From: Varun Gupta Date: Tue, 10 Jul 2018 13:54:04 +0530 Subject: MDEV-16307: Incorrect results when using BNLH join instead of BNL join with views In this issue we are using derived_with_keys optimization and we are using these keys to do a hash join which is incorrect. We cannot create keys for dervied tables whose keyparts have types are of BLOB or TEXT type. TEXT or BLOB columns can only be indexed over a specified length. --- mysql-test/r/derived.result | 33 +++++++++++++++++++++++++++++++++ mysql-test/t/derived.test | 21 +++++++++++++++++++++ 2 files changed, 54 insertions(+) (limited to 'mysql-test') diff --git a/mysql-test/r/derived.result b/mysql-test/r/derived.result index 54c78dc9f6f..5debfaed5e3 100644 --- a/mysql-test/r/derived.result +++ b/mysql-test/r/derived.result @@ -1023,6 +1023,7 @@ INSERT INTO t2 VALUES (NULL),(NULL); CREATE TABLE t3 (c VARCHAR(1024) CHARACTER SET utf8, d INT) ENGINE=MyISAM; CREATE OR REPLACE ALGORITHM=TEMPTABLE VIEW v3 AS SELECT * FROM t3; INSERT INTO t3 VALUES ('abc',NULL),('def',4); +set @save_join_cache_level= @@join_cache_level; SET join_cache_level= 8; explain SELECT * FROM v1, t2, v3 WHERE a = c AND b = d; @@ -1052,4 +1053,36 @@ i drop procedure pr; drop view v1; drop table t1; +set @@join_cache_level= @save_join_cache_level; +# +# MDEV-16307: Incorrect results when using BNLH join instead of BNL join with views +# +CREATE TABLE t1 (c1 text, c2 int); +INSERT INTO t1 VALUES ('a',1), ('c',3), ('g',7), ('d',4), ('c',3); +CREATE TABLE t2 (c1 text, c2 int); +INSERT INTO t2 VALUES ('b',2), ('c',3); +CREATE ALGORITHM=TEMPTABLE VIEW v1 AS SELECT * FROM t1; +explain SELECT v1.c1, v1.c2, t2.c1, t2.c2 FROM v1, t2 WHERE v1.c1=t2.c1; +id select_type table type possible_keys key key_len ref rows Extra +1 PRIMARY t2 ALL NULL NULL NULL NULL 2 +1 PRIMARY ALL NULL NULL NULL NULL 5 Using where; Using join buffer (flat, BNL join) +2 DERIVED t1 ALL NULL NULL NULL NULL 5 +SELECT v1.c1, v1.c2, t2.c1, t2.c2 FROM v1, t2 WHERE v1.c1=t2.c1; +c1 c2 c1 c2 +c 3 c 3 +c 3 c 3 +set @save_join_cache_level= @@join_cache_level; +set @@join_cache_level=4; +explain SELECT v1.c1, v1.c2, t2.c1, t2.c2 FROM v1, t2 WHERE v1.c1=t2.c1; +id select_type table type possible_keys key key_len ref rows Extra +1 PRIMARY t2 ALL NULL NULL NULL NULL 2 Using where +1 PRIMARY hash_ALL NULL #hash#$hj 3 test.t2.c1 5 Using where; Using join buffer (flat, BNLH join) +2 DERIVED t1 ALL NULL NULL NULL NULL 5 +SELECT v1.c1, v1.c2, t2.c1, t2.c2 FROM v1, t2 WHERE v1.c1=t2.c1; +c1 c2 c1 c2 +c 3 c 3 +c 3 c 3 +drop table t1,t2; +drop view v1; +set @@join_cache_level= @save_join_cache_level; # end of 5.5 diff --git a/mysql-test/t/derived.test b/mysql-test/t/derived.test index c5b792c8d4d..217203422e0 100644 --- a/mysql-test/t/derived.test +++ b/mysql-test/t/derived.test @@ -880,6 +880,7 @@ CREATE TABLE t3 (c VARCHAR(1024) CHARACTER SET utf8, d INT) ENGINE=MyISAM; CREATE OR REPLACE ALGORITHM=TEMPTABLE VIEW v3 AS SELECT * FROM t3; INSERT INTO t3 VALUES ('abc',NULL),('def',4); +set @save_join_cache_level= @@join_cache_level; SET join_cache_level= 8; explain SELECT * FROM v1, t2, v3 WHERE a = c AND b = d; @@ -902,5 +903,25 @@ call pr(2); drop procedure pr; drop view v1; drop table t1; +set @@join_cache_level= @save_join_cache_level; +--echo # +--echo # MDEV-16307: Incorrect results when using BNLH join instead of BNL join with views +--echo # + +CREATE TABLE t1 (c1 text, c2 int); +INSERT INTO t1 VALUES ('a',1), ('c',3), ('g',7), ('d',4), ('c',3); +CREATE TABLE t2 (c1 text, c2 int); +INSERT INTO t2 VALUES ('b',2), ('c',3); +CREATE ALGORITHM=TEMPTABLE VIEW v1 AS SELECT * FROM t1; + +explain SELECT v1.c1, v1.c2, t2.c1, t2.c2 FROM v1, t2 WHERE v1.c1=t2.c1; +SELECT v1.c1, v1.c2, t2.c1, t2.c2 FROM v1, t2 WHERE v1.c1=t2.c1; +set @save_join_cache_level= @@join_cache_level; +set @@join_cache_level=4; +explain SELECT v1.c1, v1.c2, t2.c1, t2.c2 FROM v1, t2 WHERE v1.c1=t2.c1; +SELECT v1.c1, v1.c2, t2.c1, t2.c2 FROM v1, t2 WHERE v1.c1=t2.c1; +drop table t1,t2; +drop view v1; +set @@join_cache_level= @save_join_cache_level; --echo # end of 5.5 -- cgit v1.2.1