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https://issues.apache.org/jira/browse/HIVE-21959?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16880961#comment-16880961
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Zoltan Haindrich commented on HIVE-21959:
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+1
> Clean up Concatenate and Msck DDL commands
> ------------------------------------------
>
> Key: HIVE-21959
> URL: https://issues.apache.org/jira/browse/HIVE-21959
> Project: Hive
> Issue Type: Sub-task
> Components: Hive
> Affects Versions: 3.1.1
> Reporter: Miklos Gergely
> Assignee: Miklos Gergely
> Priority: Major
> Labels: pull-request-available, refactor-ddl
> Fix For: 4.0.0
>
> Attachments: HIVE-21959.01.patch, HIVE-21959.02.patch,
> HIVE-21959.03.patch, HIVE-21959.04.patch
>
> Time Spent: 1h 50m
> Remaining Estimate: 0h
>
> Concatenate and Msck DDL use basic data structure implementations instead of
> their interfaces for variable declaration, like ArrayList instead of List,
> LinkedHashMap instead of Map, etc. This is due to a lot of similar issues in
> the code, which needs to be cleaned.
> Concatenate also had a non-immutable Desc class, that needs to be transformed
> into an immutable one. Concatenate operation code should be cut into smaller
> functions.
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