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4.1->5.0 merge for bug #16458
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@@ -537,7 +537,7 @@ id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE t2 index NULL PRIMARY 8 NULL 3 Using index
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EXPLAIN SELECT DISTINCT a,a FROM t2;
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE t2 index NULL PRIMARY 8 NULL 3 Using index; Using temporary
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1 SIMPLE t2 index NULL PRIMARY 8 NULL 3 Using index
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EXPLAIN SELECT DISTINCT b,a FROM t2;
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE t2 index NULL PRIMARY 8 NULL 3 Using index
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