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Setting it to minor because queries are weird, and the problem is only reproducible on 5.5
CREATE TABLE t1 (i INT) ENGINE=MyISAM;
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INSERT INTO t1 VALUES (2),(7),(2),(2),(4),(6),(6),(8),(4),(2),(8),(1),(NULL),(3),(2);
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SELECT ( SELECT DISTINCT i FROM `t1` WHERE i GROUP BY @a := 1 WITH ROLLUP ) AS s1;
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SELECT NULL FROM `t1` GROUP BY 'binary', LAST_DAY('2012-12-12') WITH ROLLUP;
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5.5 ec6d8dadc01269451332e5b24b12a5350a2a4896
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Error: Freeing overrun buffer mysys/safemalloc.c:179, mysys/my_malloc.c:120, sql/filesort.cc:320, sql/sql_select.cc:19937, sql/sql_select.cc:2837, sql/sql_select.cc:3096, sql/sql_select.cc:319, sql/sql_parse.cc:4686
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Allocated at sql/filesort.cc:219, sql/sql_select.cc:19937, sql/sql_select.cc:1888, sql/sql_select.cc:2402, sql/item_subselect.cc:3269, sql/item_subselect.cc:663, sql/item_subselect.cc:1244, sql/item.cc:6642
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