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create temporary table t1 (a int not null, b int, c varchar(400), d varchar(400), primary key (a), key (b)) engine=MEMORY comment="testing heaps" block_size=24;
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insert into t1 values (1,1,'012',NULL), (2,2,'0123456789',NULL), (3,3,'012345678901234567890123456789',NULL), (4,4,NULL,'0123456789012345678901234567890123456789012345678901234567890123456789');