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https://issues.apache.org/jira/browse/PHOENIX-1614?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16721402#comment-16721402
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Toshihiro Suzuki commented on PHOENIX-1614:
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I will work on this issue.
> ALTER TABLE ADD IF NOT EXISTS doesn't work as expected
> ------------------------------------------------------
>
> Key: PHOENIX-1614
> URL: https://issues.apache.org/jira/browse/PHOENIX-1614
> Project: Phoenix
> Issue Type: Bug
> Reporter: Gabriel Reid
> Assignee: Toshihiro Suzuki
> Priority: Major
> Labels: argus
> Fix For: 4.15.0
>
>
> On an existing table table, executing "ALTER TABLE ADD IF NOT EXISTS
> thisColAlreadyExists varchar, thisColDoesNotExist varchar", then
> nothing will be changed in the table because thisColAlreadyExists
> already exists.
> Omitting the already-existing column from the statement, all new columns
> do get created.
> The general expectation would be that when you use ADD IF NOT EXISTS, all
> non-existent columns will be added, and all existing columns in the
> statement will just be ignored. There is already an integration test
> (AlterTableIT#testAddVarCols) that actually demonstrates the current
> behavior, although this is probably not correct.
> As pointed out in the related mailing list thread [1], ALTER TABLE DROP
> COLUMN likely suffers from the same issue.
> 1. http://s.apache.org/LMT
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