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https://issues.apache.org/jira/browse/HIVE-8810?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14205597#comment-14205597
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Jimmy Xiang commented on HIVE-8810:
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Had a chat with Chao and Szehon. Let's have Spark specific operator to be clean.
> Make HashTableSinkOperator works for Spark Branch [Spark Branch]
> ----------------------------------------------------------------
>
> Key: HIVE-8810
> URL: https://issues.apache.org/jira/browse/HIVE-8810
> Project: Hive
> Issue Type: Sub-task
> Components: Spark
> Affects Versions: spark-branch
> Reporter: Chao
> Assignee: Jimmy Xiang
>
> In MR, all small tables for a particular MJ operator share the same instance
> of {{HashTableSinkOperator}}, while in Spark branch, each small table
> corresponds to a different {{HashTableSinkOperator}} instance. This
> difference causes some issues.
> For instance, in {{HashTableSinkOperator#processOp}}, it uses a tag to look
> for information in various data structures, such as {{joinKeys}},
> {{filterMaps}}, {{joinValues}}, etc. Those data structures stores the
> information BEFORE it splits the MJ operator with its parents. But, since
> later on we use separate {{HashTableSinkOperator}} for each small table, that
> information is no longer valid, and thus this method will fail.
> This JIRA is to track and solve these related issues.
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