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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.
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