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CREATE TABLE t (a INT AUTO_INCREMENT, b INT, UNIQUE(b,a DESC)) ENGINE=MyISAM;
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INSERT IGNORE INTO t (b) VALUES (10),(10),(10);
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SELECT * FROM t;
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# Cleanup
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DROP TABLE t;
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preview-10.8-MDEV-13756-desc-indexes 43444ff5
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INSERT IGNORE INTO t (b) VALUES (10),(10),(10);
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Warnings:
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Warning 1062 Duplicate entry '10-2' for key 'b'
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SELECT * FROM t;
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a b
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2 10
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1 10
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Without the DESC attribute, the value of `a` would continue to be auto-incremented, no warnings/errors would occur upon INSERT, and there would be 3 values in the table at the end:
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Expected result (apart from sorting in SELECT)
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INSERT IGNORE INTO t (b) VALUES (10),(10),(10);
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SELECT * FROM t;
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a b
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1 10
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2 10
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3 10
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Also reproducible with Aria.
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