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From "Ashutosh Chauhan (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HIVE-12320) hive.metastore.disallow.incompatible.col.type.changes should be true by default
Date Wed, 04 Nov 2015 00:33:27 GMT

    [ https://issues.apache.org/jira/browse/HIVE-12320?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14988599#comment-14988599
] 

Ashutosh Chauhan commented on HIVE-12320:
-----------------------------------------

Thats right and that indeed is intentional, since once you go to wider type going back to
narrower type may give you wrong/corrupt/truncated data. Those are the cases which we want
to prevent by default. But, if user still wants narrower type he can chose to set config to
false to do it.

> hive.metastore.disallow.incompatible.col.type.changes should be true by default
> -------------------------------------------------------------------------------
>
>                 Key: HIVE-12320
>                 URL: https://issues.apache.org/jira/browse/HIVE-12320
>             Project: Hive
>          Issue Type: Improvement
>          Components: Configuration, Types
>    Affects Versions: 0.12.0, 0.13.0, 0.14.0, 1.0.0, 1.2.0, 1.1.0
>            Reporter: Ashutosh Chauhan
>            Assignee: Ashutosh Chauhan
>         Attachments: HIVE-12320.2.patch, HIVE-12320.3.patch, HIVE-12320.patch
>
>
> By default all types of schema changes are permitted. This config adds capability to
disallow incompatible column type changes. This should be on by default.



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