[SPARK-17732][SQL] Revert ALTER TABLE DROP PARTITION should support comparators #16036
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What changes were proposed in this pull request?
#15704 will fail if we use int literal in
DROP PARTITION, and we have reverted it in branch-2.1.This PR reverts it in master branch, and add a regression test for it, to make sure the master branch is healthy.
How was this patch tested?
new regression test