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Commit 5d35d5c1 authored by Xiao Li's avatar Xiao Li Committed by Wenchen Fan
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[SPARK-21112][SQL] ALTER TABLE SET TBLPROPERTIES should not overwrite COMMENT 

### What changes were proposed in this pull request?
`ALTER TABLE SET TBLPROPERTIES` should not overwrite `COMMENT` even if the input property does not have the property of `COMMENT`. This PR is to fix the issue.

### How was this patch tested?
Covered by the existing tests.

Author: Xiao Li <gatorsmile@gmail.com>

Closes #18318 from gatorsmile/fixTableComment.
parent a18d6371
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