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https://issues.apache.org/jira/browse/KUDU-1480?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15321425#comment-15321425
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Mike Percy commented on KUDU-1480:
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See AlterTableRequest in
https://github.com/apache/incubator-kudu/blob/master/src/kudu/master/master.proto
for a list of supported alter operations from a wire protocol perspective.
> 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: Bug
> Components: tablet
> Affects Versions: 0.9.0
> Reporter: Mike Percy
>
> 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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