Eugene Koifman commented on HIVE-21165:

The logic in HIVE-20738 relies on this index.

> ACID: pass query hint to the writers to write hive.acid.key.index
> -----------------------------------------------------------------
>                 Key: HIVE-21165
>                 URL: https://issues.apache.org/jira/browse/HIVE-21165
>             Project: Hive
>          Issue Type: Bug
>          Components: Transactions
>    Affects Versions: 3.1.1
>            Reporter: Vaibhav Gumashta
>            Assignee: Vaibhav Gumashta
>            Priority: Major
> For the query based compactor from HIVE-20699, the compaction runs as a sql 
> query. However, this mechanism skips over writing hive.acid.key.index for 
> each stripe, which is used to skip over stripes that are not supposed to be 
> read. We need a way to pass a query hint to the writer so that it can write 
> this index data, when invoked from a sql query.

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