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49 lines
1.5 KiB
49 lines
1.5 KiB
#
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# Bug #20087571: 5.7 EASILY HITS ERROR 1436 (HY000):
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# THREAD STACK OVERRUN ERRORS ON MANY EXPR'S
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#
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SELECT @tmp_max:= @@global.max_allowed_packet;
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@tmp_max:= @@global.max_allowed_packet
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67108864
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Warnings:
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Warning 1287 Setting user variables within expressions is deprecated and will be removed in a future release. Consider alternatives: 'SET variable=expression, ...', or 'SELECT expression(s) INTO variables(s)'.
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SET @@global.max_allowed_packet=16999424;
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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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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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CALL p1(630000, 630000, 100000);
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numterms query lengt increment
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630000 10710017 100000
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SELECT LENGTH(@terms);
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LENGTH(@terms)
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10709996
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SELECT @@global.max_allowed_packet;
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@@global.max_allowed_packet
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16999424
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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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SET @@global.max_allowed_packet:= @tmp_max;
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#
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