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merge with mysql-5.5.30 minus few incorrect or not applicable changesets
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@ -343,7 +343,7 @@ id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE t1 index NULL PRIMARY 5 NULL 4 Using index; Using temporary
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explain select distinct f1, f2 from t1;
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE t1 range NULL PRIMARY 5 NULL 3 Using index for group-by; Using temporary
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1 SIMPLE t1 index NULL PRIMARY 5 NULL 4 Using index
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drop table t1;
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CREATE TABLE t1 (id int(11) NOT NULL PRIMARY KEY, name varchar(20),
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INDEX (name));
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