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9419908f38
After the commit b76b69cd5f
loose index scan for queries with DISTINCT stopped working.
That is why that commit has to be reverted.
Additionally this patch fixes the problem of MDEV-10880.
11 lines
450 B
Text
11 lines
450 B
Text
drop table if exists t1;
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create table t1(n int not null, key(n)) delay_key_write = 1;
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select count(distinct n) from t1;
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count(distinct n)
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100
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explain extended select count(distinct n) from t1;
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id select_type table type possible_keys key key_len ref rows filtered Extra
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1 SIMPLE t1 range NULL n 4 NULL 10 100.00 Using index for group-by
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Warnings:
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Note 1003 select count(distinct `test`.`t1`.`n`) AS `count(distinct n)` from `test`.`t1`
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drop table t1;
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