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https://issues.apache.org/jira/browse/IMPALA-3118?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16698112#comment-16698112
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quemf commented on IMPALA-3118:
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I found in my actual test, bucketed tables localized calculation complete, then
data exchange is unnecessary。
This is the reason why
[clichouse|https://[c|https://clickhouse.yandex/]lickhouse.yandex] is faster at
specific scene。
I hope impala can solve the problem!
> Bucketed table support
> ----------------------
>
> Key: IMPALA-3118
> URL: https://issues.apache.org/jira/browse/IMPALA-3118
> Project: IMPALA
> Issue Type: New Feature
> Components: Backend, Frontend
> Affects Versions: Impala 2.2, Impala 2.3.0, Impala 2.5.0
> Reporter: Mostafa Mokhtar
> Assignee: Marcel Kornacker
> Priority: Minor
> Labels: performance
>
> Bucketed tables are hash partitioned which means joins and aggregations
> bucketing columns can be done without exchange
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