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BUG#877288: Wrong result with semijoin + materialization + multipart key

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- when create_ref_for_key() is constructing a ref access for
  a table that's inside a SJ-Materialization nest, it may not 
  use references to fields of tables that are unside the nest (because 
  these fields will not yet have values when ref access will be used)
  
  The check was performed in the first of create_ref_for_key's loops (the 
  one which counts how many key parts are usable) but not in the second
  (the one which actually fills the TABLE_REF structure).
This commit is contained in:
Sergey Petrunya 2011-10-26 02:38:49 +04:00
commit 8e6440df0b
4 changed files with 83 additions and 1 deletions
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19
mysql-test/t/subselect_sj.test
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@ -1807,6 +1807,25 @@ set optimizer_switch= @tmp_os_861147;
DROP TABLE t1,t2,t3,t4,t5,t6;
--echo #
--echo # BUG#877288: Wrong result with semijoin + materialization + multipart key
--echo #
set @tmp_877288=@@optimizer_switch;
set optimizer_switch='semijoin=ON,materialization=ON';
CREATE TABLE t1 ( a int) ;
INSERT INTO t1 VALUES (19),(19),(19),(20),(20),(20),(20),(20),(20);
CREATE TABLE t2 ( b int NOT NULL , c int NOT NULL , KEY (b,c)) ;
INSERT INTO t2 VALUES (14,1),(15,1),(16,1),(17,1),(18,1),(19,1),(20,1);
CREATE TABLE t3 ( a int, d int) ;
INSERT INTO t3 VALUES (19,1),(7,1),(3,1),(3,1),(20,1),(3,1),(16,1),(17,1),(9,1),(4,1),(6,1),(15,1),(17,1);
explain
SELECT * FROM t1 WHERE (a) IN (SELECT a FROM t2 JOIN t3 ON b = a);
SELECT * FROM t1 WHERE (a) IN (SELECT a FROM t2 JOIN t3 ON b = a);
DROP TABLE t1,t2,t3;
set optimizer_switch=@tmp_877288;
# The following command must be the last one the file
set optimizer_switch=@subselect_sj_tmp;