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24 lines
731 B
Text
24 lines
731 B
Text
CREATE TABLE t(a INT PRIMARY KEY, b INT, c INT, UNIQUE KEY `b_c` (`b`,`c`))
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ENGINE=InnoDB, STATS_PERSISTENT=0;
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INSERT INTO t SET a = 1, c = 2;
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connect con1,localhost,root;
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BEGIN;
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INSERT INTO t SET a=2, c=2;
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connection default;
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BEGIN;
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SET DEBUG_SYNC="lock_wait_start SIGNAL select_locked";
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SELECT * FROM t FORCE INDEX(b) FOR UPDATE;
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connection con1;
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SET DEBUG_SYNC="now WAIT_FOR select_locked";
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ROLLBACK;
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connection default;
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# If the bug is not fixed, and the both unique index key fields are
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# NULL, there will be two (1, NULL, 2) rows in the result,
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# because cursor will be restored to (NULL, 2, 1) position for
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# secondary key instead of "supremum".
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a b c
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1 NULL 2
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COMMIT;
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SET DEBUG_SYNC="RESET";
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disconnect con1;
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DROP TABLE t;
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