[jira] [Commented] (HIVE-8810) Make HashTableSinkOperator works for Spark Branch [Spark Branch]

["Jimmy Xiang (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/HIVE-8810?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14205597#comment-14205597 ] 

Jimmy Xiang commented on HIVE-8810:
-----------------------------------

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 But, since later on we use separate {{HashTableSinkOperator}} for each small table, that information is no longer valid, and thus this method will fail.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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