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Merge pull request #3955 from yandex/low-cardinality-fix-clone-empty

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Do not copy dictionary in ColumnLowCardinality::cloneEmpty
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alexey-milovidov 2018-12-29 01:23:07 +03:00 committed by GitHub
commit b8e847edfd
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1 changed files with 3 additions and 0 deletions
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3
dbms/src/Columns/ColumnLowCardinality.cpp
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@ -236,6 +236,9 @@ void ColumnLowCardinality::gather(ColumnGathererStream & gatherer)
MutableColumnPtr ColumnLowCardinality::cloneResized(size_t size) const
{
auto unique_ptr = dictionary.getColumnUniquePtr();
if (size == 0)
unique_ptr = unique_ptr->cloneEmpty();
return ColumnLowCardinality::create((*std::move(unique_ptr)).mutate(), getIndexes().cloneResized(size));
}