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https://issues.apache.org/jira/browse/HIVE-20699?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16686179#comment-16686179
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Vaibhav Gumashta commented on HIVE-20699:
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[~ekoifman] This is a partial patch for review. I'll attach another one with
test cases. This depends on ORC-437.
> Query based compactor for full CRUD Acid tables
> -----------------------------------------------
>
> Key: HIVE-20699
> URL: https://issues.apache.org/jira/browse/HIVE-20699
> Project: Hive
> Issue Type: New Feature
> Components: Transactions
> Affects Versions: 3.1.0
> Reporter: Eugene Koifman
> Assignee: Vaibhav Gumashta
> Priority: Major
> Attachments: HIVE-20699.1.patch
>
>
> Currently the Acid compactor is implemented as generated MR job
> ({{CompactorMR.java}}).
> It could also be expressed as a Hive query that reads from a given partition
> and writes data back to the same partition. This will merge the deltas and
> 'apply' the delete events. The simplest would be to just use Insert
> Overwrite but that will change all ROW__IDs which we don't want.
> Need to implement this in a way that preserves ROW__IDs and creates a new
> {{base_x}} directory to handle Major compaction.
> Minor compaction will be investigated separately.
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