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https://issues.apache.org/jira/browse/HIVE-17284?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16358915#comment-16358915
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Eugene Koifman commented on HIVE-17284:
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this may not be the right thing to do.  ORC flattens structs (ROW__ID) and will 
maintain min/max for individual columns.  To filter events we really need 
min/max ROW__ID

> remove OrcRecordUpdater.deleteEventIndexBuilder
> -----------------------------------------------
>
>                 Key: HIVE-17284
>                 URL: https://issues.apache.org/jira/browse/HIVE-17284
>             Project: Hive
>          Issue Type: Improvement
>          Components: Transactions
>    Affects Versions: 3.0.0
>            Reporter: Eugene Koifman
>            Assignee: Eugene Koifman
>            Priority: Minor
>
> There is no point in it. We know how many rows a delete_delta file has from 
> ORC and they are all the same type - so no need for AcidStats.
>  hive.acid.key.index has no value since delete_delta files are never split 
> and are not likely to have more than 1 stripe since they are very small.
> Also can remove KeyIndexBuilder.acidStats - we only have 1 type of event per 
> file
>  
> if doing this, make sure to fix {{OrcInputFormat.isOriginal(Reader)}} and 
> {{OrcInputFormat.isOriginal(Footer)}} etc



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