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63 lines
1.6 KiB
63 lines
1.6 KiB
#
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# Input parameters:
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#
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# $min20087571: minimal number of "(a=1 and b=2)" disjuncts
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# $max20087571: maximal number of "(a=1 and b=2)" disjuncts
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#
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--echo #
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--echo # Bug #20087571: 5.7 EASILY HITS ERROR 1436 (HY000):
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--echo # THREAD STACK OVERRUN ERRORS ON MANY EXPR'S
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--echo #
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# we need a larger max_allowed_packet for the REPEAT() function
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SELECT @tmp_max:= @@global.max_allowed_packet;
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SET @@global.max_allowed_packet=16999424;
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# switching connection to allow the new max_allowed_packet take effect
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--connect (newconn, localhost, root,,)
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CREATE TABLE t1 (a INT UNSIGNED, b INT UNSIGNED, PRIMARY KEY (a, b))
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ENGINE=INNODB;
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DELIMITER |;
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CREATE PROCEDURE p1(p_min_terms INT UNSIGNED, p_max_terms INT UNSIGNED, p_incr
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INT UNSIGNED)
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begin
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DECLARE v_sql LONGTEXT CHARSET LATIN1;
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DECLARE i INT UNSIGNED DEFAULT 1;
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SET i:=greatest(1, p_min_terms);
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REPEAT
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SET @terms:=f1(i);
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SET v_sql:=concat("delete from t1 where ",@terms);
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SET @t:=v_sql;
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SELECT i AS 'numterms', length(@t) AS 'query lengt', p_incr AS 'increment';
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PREPARE s FROM @t;
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EXECUTE s;
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DEALLOCATE PREPARE s;
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SET i:=i + p_incr;
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UNTIL i > p_max_terms end repeat;
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END|
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CREATE FUNCTION f1(p_numterms INT UNSIGNED) RETURNS LONGTEXT
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BEGIN
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DECLARE ret LONGTEXT DEFAULT '';
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SET ret:=CONCAT(REPEAT("(a=1 and b=2) or ",GREATEST(p_numterms-1,1)),"(a=2 and b=1)");
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RETURN RET;
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END|
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DELIMITER ;|
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eval CALL p1($min20087571, $max20087571, 100000);
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SELECT LENGTH(@terms);
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SELECT @@global.max_allowed_packet;
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DROP FUNCTION f1;
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DROP PROCEDURE p1;
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DROP TABLE t1;
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--connection default
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SET @@global.max_allowed_packet:= @tmp_max;
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--disconnect newconn
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--echo #
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