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Merge pull request #4367 from yandex/unified-sets-fix-lc-cache

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Fix LowCardinality cache for ColumnsHashing
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alexey-milovidov 2019-02-12 21:24:52 +03:00 committed by GitHub
commit d8aa74bc64
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3 changed files with 9 additions and 0 deletions
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3
dbms/src/Common/ColumnsHashing.h
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@ -364,7 +364,10 @@ struct HashMethodSingleLowCardinalityColumn : public SingleColumnMethod
}
if constexpr (has_mapped)
{
mapped_cache[row] = it->second;
return EmplaceResult(it->second, mapped_cache[row], inserted);
}
else
return EmplaceResult(inserted);
}

1
dbms/tests/queries/0_stateless/906_low_cardinality_cache.reference Normal file
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@ -0,0 +1 @@
100000000 0123456789

5
dbms/tests/queries/0_stateless/906_low_cardinality_cache.sql Normal file
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@ -0,0 +1,5 @@
drop table if exists test.lc;
create table test.lc (b LowCardinality(String)) engine=MergeTree order by b;
insert into test.lc select '0123456789' from numbers(100000000);
select count(), b from test.lc group by b;
drop table if exists test.lc;