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https://issues.apache.org/jira/browse/HIVE-14035?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15417754#comment-15417754
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Sergey Shelukhin commented on HIVE-14035:
-----------------------------------------

+1 pending others' comments

> Enable predicate pushdown to delta files created by ACID Transactions
> ---------------------------------------------------------------------
>
>                 Key: HIVE-14035
>                 URL: https://issues.apache.org/jira/browse/HIVE-14035
>             Project: Hive
>          Issue Type: New Feature
>          Components: Transactions
>            Reporter: Saket Saurabh
>            Assignee: Saket Saurabh
>         Attachments: HIVE-14035.02.patch, HIVE-14035.03.patch, 
> HIVE-14035.04.patch, HIVE-14035.05.patch, HIVE-14035.06.patch, 
> HIVE-14035.07.patch, HIVE-14035.08.patch, HIVE-14035.09.patch, 
> HIVE-14035.10.patch, HIVE-14035.11.patch, HIVE-14035.12.patch, 
> HIVE-14035.13.patch, HIVE-14035.14.patch, HIVE-14035.15.patch, 
> HIVE-14035.16.patch, HIVE-14035.patch
>
>
> In current Hive version, delta files created by ACID transactions do not 
> allow predicate pushdown if they contain any update/delete events. This is 
> done to preserve correctness when following a multi-version approach during 
> event collapsing, where an update event overwrites an existing insert event. 
> This JIRA proposes to split an update event into a combination of a delete 
> event followed by a new insert event, that can enable predicate push down to 
> all delta files without breaking correctness. To support backward 
> compatibility for this feature, this JIRA also proposes to add some sort of 
> versioning to ACID that can allow different versions of ACID transactions to 
> co-exist together.



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