ASF GitHub Bot commented on HIVE-18750:

Github user sankarh closed the pull request at:


> Exchange partition should be disabled on ACID/Insert-only tables with per 
> table write ID.
> -----------------------------------------------------------------------------------------
>                 Key: HIVE-18750
>                 URL: https://issues.apache.org/jira/browse/HIVE-18750
>             Project: Hive
>          Issue Type: Sub-task
>          Components: HiveServer2, Transactions
>    Affects Versions: 3.0.0
>            Reporter: Sankar Hariappan
>            Assignee: Sankar Hariappan
>            Priority: Major
>              Labels: ACID, DDL, TODOC3.0, pull-request-available
>             Fix For: 3.0.0
>         Attachments: HIVE-18750.01.patch, HIVE-18750.02.patch
> Per table write id implementation (HIVE-18192) have introduced write ID per 
> table and used write ID to name the delta/base files and also as primary key 
> for each row.
> Now, exchange partition have to move delta/base files across tables without 
> changing the write ID which causes incorrect results. 
> Also, this exchange partition feature is there to support the use-case of 
> atomic updates. But with ACID updates, we shall support atomic-updates and 
> hence it makes sense to not support exchange partition for ACID and MM tables.
> The qtest file mm_exchangepartition.q test results to be updated after this 
> change.

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