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Low cardinality join#3799

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alexey-milovidov merged 3 commits intomasterfrom
low-cardinality-join
Dec 10, 2018
Merged

Low cardinality join#3799
alexey-milovidov merged 3 commits intomasterfrom
low-cardinality-join

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@KochetovNicolai
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I hereby agree to the terms of the CLA available at: https://yandex.ru/legal/cla/?lang=en

@alexey-milovidov alexey-milovidov merged commit a083e6b into master Dec 10, 2018
@alexey-milovidov
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It looks like first minimal solution: no special optimization for LowCardinality, it just works better than default "hashed" method. Correct me if I'm wrong.

@alexey-milovidov
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BTW both Set and Join can benefit from simple and efficient implementation for LowCardinality (project right hand side dictionary onto left hand side dictionary).

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