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Memory usage is larger than needed. #10818

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Memory usage is larger than needed.#10818
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alexey-milovidov
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memoryWhen memory usage is higher than expectedunexpected behaviourResult is unexpected, but not entirely wrong at the same time.
@alexey-milovidov

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@alexey-milovidov
alexey-milovidov
opened on May 11, 2020

The query

clickhouse-benchmark --max_threads 16 <<< "select WatchID from hits_100m_obfuscated group by WatchID limit 10"

will lead to sustained memory usage of 26 GiB despite the fact that the query only takes 4..5 GiB.

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memoryWhen memory usage is higher than expectedunexpected behaviourResult is unexpected, but not entirely wrong at the same time.

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