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@ -1730,6 +1730,15 @@ explain select * from t1 order by a,b,c,d;
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE t1 ALL NULL NULL NULL NULL 3 Using filesort
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drop table t1;
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create table t1 (a char(1), b char(1), key(a, b)) engine=innodb;
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insert into t1 values ('8', '6'), ('4', '7');
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select min(a) from t1;
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min(a)
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4
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select min(b) from t1 where a='8';
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min(b)
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6
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drop table t1;
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create table t1 (x bigint unsigned not null primary key) engine=innodb;
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insert into t1(x) values (0xfffffffffffffff0),(0xfffffffffffffff1);
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select * from t1;
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