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https://issues.apache.org/jira/browse/KUDU-1480?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17121144#comment-17121144
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Grant Henke commented on KUDU-1480:
-----------------------------------
It is possible to change the column default along with some other column
attributes. However, it's still not possible to make a column nullable or widen
the data type.
> alter table: Allow for non-destructive modification of columns
> --------------------------------------------------------------
>
> Key: KUDU-1480
> URL: https://issues.apache.org/jira/browse/KUDU-1480
> Project: Kudu
> Issue Type: New Feature
> Components: tablet
> Affects Versions: 0.9.0
> Reporter: Mike Percy
> Priority: Major
>
> Kudu doesn't currently allow for modifying a column, except for its name.
> We should be able to support additional modifications:
> * Widen a data type (int32 -> int64)
> * Make a column nullable
> * Change a column default
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