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Merge 10.3 into 10.4
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@ -413,7 +413,7 @@ EXPLAIN
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SELECT a FROM t1 WHERE (a,b) IN (SELECT * FROM v2);
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id select_type table type possible_keys key key_len ref rows Extra
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1 PRIMARY t1 ALL NULL NULL NULL NULL 2 Using where
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1 PRIMARY <derived3> ref key0 key0 10 test.t1.a,test.t1.b 2 FirstMatch(t1)
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1 PRIMARY <derived3> ref key0 key0 10 test.t1.a,test.t1.b 1 FirstMatch(t1)
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3 DERIVED t2 ALL NULL NULL NULL NULL 6
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4 UNION t3 ALL NULL NULL NULL NULL 4
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NULL UNION RESULT <union3,4> ALL NULL NULL NULL NULL NULL
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