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a temporary table has grown out of heap memory reserved for it and the remaining disk space is not big enough to store the table as a MyISAM table. The crash happens because the function create_myisam_from_heap does not handle safely the mem_root structure associated with the converted table in the case when an error has occurred. sql/sql_select.cc: Fixed bug #28449: a crash may happen at some rare conditions when a temporary table has grown out of heap memory reserved for it and the remaining disk space is not big enough to store the table as a MyISAM table. The crash happens because the function create_myisam_from_heap does not handle safely the mem_root structure associated with the converted table in the case when an error has occurred. As it's hard to create a sitiation that would throw an error a special code has been added that raises an error for a newly created test called error_simulation. mysql-test/r/error_simulation.result: New BitKeeper file ``mysql-test/r/error_simulation.result'' Added a test case for bug #28449. mysql-test/t/error_simulation-master.opt: New BitKeeper file ``mysql-test/t/error_simulation-master.opt'' mysql-test/t/error_simulation.test: New BitKeeper file ``mysql-test/t/error_simulation.test'' Added a test case for bug #28449.
19 lines
766 B
Text
19 lines
766 B
Text
DROP TABLE IF EXISTS t1;
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Warnings:
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Note 1051 Unknown table 't1'
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CREATE TABLE t1 (
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a varchar(32) character set utf8 collate utf8_bin NOT NULL,
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b varchar(32) character set utf8 collate utf8_bin NOT NULL )
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ENGINE=MyISAM DEFAULT CHARSET=utf8;
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INSERT INTO t1 VALUES
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('AAAAAAAAAA','AAAAAAAAAA'), ('AAAAAAAAAB','AAAAAAAAAB '),
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('AAAAAAAAAB','AAAAAAAAAB'), ('AAAAAAAAAC','AAAAAAAAAC'),
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('AAAAAAAAAD','AAAAAAAAAD'), ('AAAAAAAAAE','AAAAAAAAAE'),
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('AAAAAAAAAF','AAAAAAAAAF'), ('AAAAAAAAAG','AAAAAAAAAG'),
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('AAAAAAAAAH','AAAAAAAAAH'), ('AAAAAAAAAI','AAAAAAAAAI'),
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('AAAAAAAAAJ','AAAAAAAAAJ'), ('AAAAAAAAAK','AAAAAAAAAK');
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set tmp_table_size=1024;
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SELECT MAX(a) FROM t1 GROUP BY a,b;
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ERROR 23000: Can't write; duplicate key in table ''
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set tmp_table_size=default;
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DROP TABLE t1;
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