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16 lines
850 B
Text
16 lines
850 B
Text
CREATE TABLE t1 (i INT AUTO_INCREMENT, c VARCHAR(1), KEY(i), KEY(c,i)) ENGINE=MyISAM CHARSET=latin1;
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INSERT INTO t1 (c) select mid("abcdefgh", mod(seq,8)+1, 1) from seq_1_to_256;
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explain SELECT 1 FROM t1 AS alias1, t1 AS alias2, t1 AS alias3
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WHERE alias1.c = alias2.c OR alias1.i <= 1;
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE alias2 index c c 8 NULL 256 Using index
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1 SIMPLE alias3 index NULL i 4 NULL 256 Using index; Using join buffer (flat, BNL join)
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1 SIMPLE alias1 ALL i,c NULL NULL NULL 256 Range checked for each record (index map: 0x3)
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set @old_dbug=@@session.debug_dbug;
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SET debug_dbug="+d,kill_join_init_read_record";
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SELECT 1 FROM t1 AS alias1, t1 AS alias2, t1 AS alias3
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WHERE alias1.c = alias2.c OR alias1.i <= 1
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;
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ERROR 70100: Query execution was interrupted
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SET debug_dbug=@old_dbug;
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DROP TABLE t1;
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