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https://issues.apache.org/jira/browse/HIVE-8839?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14211700#comment-14211700
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Szehon Ho commented on HIVE-8839:
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Hi Chaoyu, this is a welcome patch.
I think you uploaded the wrong patch in the last upload. Another request is,
sorry about this, but can you upload the whole patch here, but a version of the
patch to the review board without the thrift changes? I tried several times,
but somehow I cant load the entire patch in RB if it has all the thrift stuff,
and wanted to add some comments. Thanks!
> Support "alter table .. add/replace columns cascade"
> ----------------------------------------------------
>
> Key: HIVE-8839
> URL: https://issues.apache.org/jira/browse/HIVE-8839
> Project: Hive
> Issue Type: Improvement
> Components: SQL
> Environment:
> Reporter: Chaoyu Tang
> Assignee: Chaoyu Tang
> Fix For: 0.15.0
>
> Attachments: HIVE-8784.1.patch, HIVE-8839.patch
>
>
> We often run into some issues like HIVE-6131which is due to inconsistent
> column descriptors between table and partitions after alter table.
> HIVE-8441/HIVE-7971 provided the flexibility to alter table at partition
> level. But most cases we have need change the table and partitions at same
> time. In addition, "alter table" is usually required prior to "alter table
> partition .." since querying table partition data is also through table.
> Instead of do that in two steps, here we provide a convenient ddl like "alter
> table ... cascade" to cascade table changes to partitions as well. The
> changes are only limited and applicable to add/replace columns and change
> column name, datatype, position and comment.
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