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https://issues.apache.org/jira/browse/IMPALA-2787?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Tim Armstrong resolved IMPALA-2787.
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Resolution: Won't Fix
It's a little underspecified what the use-case is, but I don't know that we
necessarily want to add a customized operation for this (as opposed to INSERT
OVERWRITE .. SELECT DISTINCT)
> Support de-duplicate records in Impala
> --------------------------------------
>
> Key: IMPALA-2787
> URL: https://issues.apache.org/jira/browse/IMPALA-2787
> Project: IMPALA
> Issue Type: New Feature
> Components: Backend
> Affects Versions: Impala 2.2.4
> Reporter: Eric Lin
> Priority: Minor
>
> Two use cases:
> Use Case 1: Remove duplicate rows where the all data in the row is identical
> Use Case 2: Remove duplicate rows where the all data in the row is identicalm
> except for a small number of columns
> Rather than using SELECT DISTINCT from one table to another table, it would
> be great if Impala can support it natively and remove duplicate records on
> the table itself without a new table.
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