MDEV-16803: Pushdown Item_func_in item that uses vectors in several SELECTs
The bug appears because of the Item_func_in::build_clone() method. The 'array' field for the Item_func_in item that can be pushed into the materialized view/derived table was built in the wrong way. It becomes lame after the pushdown of the condition into the first SELECT that defines that view/derived table. The server crashes in the pushdown into the next SELECT while trying to use already lame 'array' field. To fix it Item_func_in::build_clone() was changed.
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@ -10220,3 +10220,24 @@ EXPLAIN
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}
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}
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DROP TABLE t1;
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#
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# MDEV-16803: pushdown condition with IN predicate in the derived table
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# defined with several SELECT statements
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#
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CREATE TABLE t1 (a INT, b INT);
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INSERT INTO t1 VALUES (1,2),(3,2),(1,1);
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SELECT * FROM
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(
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SELECT a,b,1 as c
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FROM t1
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UNION ALL
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SELECT a,b,2 as c
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FROM t1
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) AS tab
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WHERE ((a,b) IN ((1,2),(3,2)));
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a b c
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1 2 1
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3 2 1
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1 2 2
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3 2 2
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DROP TABLE t1;
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@ -2022,3 +2022,23 @@ EVAL $query;
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EVAL EXPLAIN FORMAT=JSON $query;
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DROP TABLE t1;
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--echo #
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--echo # MDEV-16803: pushdown condition with IN predicate in the derived table
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--echo # defined with several SELECT statements
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--echo #
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CREATE TABLE t1 (a INT, b INT);
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INSERT INTO t1 VALUES (1,2),(3,2),(1,1);
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SELECT * FROM
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(
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SELECT a,b,1 as c
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FROM t1
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UNION ALL
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SELECT a,b,2 as c
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FROM t1
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) AS tab
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WHERE ((a,b) IN ((1,2),(3,2)));
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DROP TABLE t1;
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@ -4436,9 +4436,8 @@ Item *Item_func_in::build_clone(THD *thd, MEM_ROOT *mem_root)
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Item_func_in *clone= (Item_func_in *) Item_func::build_clone(thd, mem_root);
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if (clone)
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{
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if (array && clone->create_array(thd))
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return NULL;
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bzero(&clone->cmp_items, sizeof(cmp_items));
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clone->fix_length_and_dec();
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}
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return clone;
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}
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