[SPARK-32168][SQL] Fix hidden partitioning correctness bug in SQL overwrite#28993

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rdblue wants to merge 3 commits intoapache:masterfrom

rdblue:fix-insert-overwrite-v2-conversion

Commits on Jul 3, 2020

Fix INSERT OVERWRITE for v2 with hidden partitions.
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Commits on Jul 6, 2020

Implement years, months, hours, and bucket transforms for tests.
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Commits on Jul 7, 2020

Remove unnecessary configuration from updated test.
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