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https://issues.apache.org/jira/browse/KUDU-2803?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16826986#comment-16826986
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Grant Henke commented on KUDU-2803:
-----------------------------------
Do you envision only supporting widening types? Is there another database that
you think supports type alteration well to use as reference?
> support non-primary key type alteration
> ---------------------------------------
>
> Key: KUDU-2803
> URL: https://issues.apache.org/jira/browse/KUDU-2803
> Project: Kudu
> Issue Type: Improvement
> Reporter: HeLifu
> Priority: Major
>
> We know that kudu does not allow the type of a column to be altered right
> now. But indeed, a very common case is RDMS -> kudu, and there will be type
> alterations inevitably, especially for small to large types.
> Currently, here are two ways to get rid of this problem:
> # for the new tables: predefine a large type for every column;
> # for the existing tables: stop app(write) > add a new column with large
> type > copy data -> drop old column -> rename new column to old column ->
> start app;
> However, neither of them is elegant. So, i think it is necessary to support
> non-primary key type alteration.
>
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