[SPARK-40753][SQL] Fix bug in test case for catalog directory operation #38206
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What changes were proposed in this pull request?
Delete the directory that has been created in advance in the test case. Add the judgment of whether the directory exists.
Why are the changes needed?
The implementation class of ExternalCatalog will perform folder operations when performing operations such as create/drop database/table/partition. The test case creates a folder in advance when obtaining the DB/Partition path URI, in unit tests the external catalog does not actually create files, resulting in the result of the test case is not convincing enough force.
Does this PR introduce any user-facing change?
No
How was this patch tested?
tests were added