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https://issues.apache.org/jira/browse/HIVE-1054?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13209634#comment-13209634
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Ashutosh Chauhan commented on HIVE-1054:
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One problem there could be that all partition values are stored as string, so
type info is completely lost in mysql. As a result partition filters cannot be
pushed in mysql for any types other then string. This is also documented in
listPartitionsByFilter() api of metastoreclient. Though, I don't find that this
is enforced anywhere (that might itself be a bug). As a result, changing a type
of partition column from string to int or vice-versa might result in change in
behavior.
> "CHANGE COLUMN" does not support changing partition column types.
> -----------------------------------------------------------------
>
> Key: HIVE-1054
> URL: https://issues.apache.org/jira/browse/HIVE-1054
> Project: Hive
> Issue Type: Bug
> Reporter: He Yongqiang
>
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