Details
Critical Description
This test case is originally subselect_sj.test
--echo #
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--echo # MDEV-5059: Wrong result (missing row) wih semijoin, join_cache_level > 2, LEFT JOIN, ORDER BY
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--echo #
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set join_buffer_size= 1024*1024*2;
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SET join_cache_level = 3;
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set optimizer_search_depth=62;
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set join_buffer_space_limit=2097152;
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set optimizer_switch="index_merge=on,index_merge_union=on,index_merge_sort_union=on,index_merge_intersection=on,index_merge_sort_intersection=off,engine_condition_pushdown=off,index_condition_pushdown=on,derived_merge=on,derived_with_keys=on,firstmatch=on,loosescan=on,materialization=on,in_to_exists=on,semijoin=on,partial_match_rowid_merge=on,partial_match_table_scan=on,subquery_cache=on,mrr=off,mrr_cost_based=off,mrr_sort_keys=off,outer_join_with_cache=on,semijoin_with_cache=on,join_cache_incremental=on,join_cache_hashed=on,join_cache_bka=on,optimize_join_buffer_size=off,table_elimination=on,extended_keys=on,exists_to_in=on,orderby_uses_equalities=on,condition_pushdown_for_derived=on,split_materialized=on";
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CREATE TABLE t1 (pk1 INT PRIMARY KEY, i1 INT) ENGINE=MyISAM;
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INSERT INTO t1 VALUES (1,4),(2,5);
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CREATE TABLE t2 (i2 INT, c2 CHAR(1)) ENGINE=MyISAM;
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INSERT INTO t2 VALUES (1,'v'),(7,'s');
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CREATE TABLE t3 (pk3 INT PRIMARY KEY, i3 INT, c3 CHAR(1), INDEX(i3), INDEX(c3,i3)) ENGINE=MyISAM;
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INSERT INTO t3 VALUES (1,7,'g'),(2,4,'p'),(3,1,'q');
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CREATE TABLE t4 (i4 INT) ENGINE=MyISAM;
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INSERT INTO t4 VALUES (1);
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SELECT * FROM t1, t2 LEFT JOIN t3 ON (c3 = c2)
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WHERE ( i2, pk1 ) IN ( SELECT i3, 1 FROM t3, t4 ) ORDER BY i1, c2;
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set join_buffer_size=262144;
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SELECT * FROM t1, t2 LEFT JOIN t3 ON (c3 = c2)
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WHERE ( i2, pk1 ) IN ( SELECT i3, 1 FROM t3, t4 ) ORDER BY i1, c2;
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DROP TABLE t1,t2,t3,t4;
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-----------
The last SELECT produces two different results:
SELECT * FROM t1, t2 LEFT JOIN t3 ON (c3 = c2)
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WHERE ( i2, pk1 ) IN ( SELECT i3, 1 FROM t3, t4 ) ORDER BY i1, c2;
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pk1 i1 i2 c2 pk3 i3 c3
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1 4 7 s 1 7 g
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1 4 7 s 2 4 p
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1 4 7 s 3 1 q
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1 4 1 v 1 7 g
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1 4 1 v 2 4 p
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1 4 1 v 3 1 q
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set join_buffer_size=262144;
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SELECT * FROM t1, t2 LEFT JOIN t3 ON (c3 = c2)
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WHERE ( i2, pk1 ) IN ( SELECT i3, 1 FROM t3, t4 ) ORDER BY i1, c2;
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pk1 i1 i2 c2 pk3 i3 c3
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1 4 7 s NULL NULL NULL
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1 4 1 v NULL NULL NULL
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