[SPARK-16632][SQL] Revert PR #14272: Respect Hive schema when merging parquet schema #14300
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What changes were proposed in this pull request?
PR #14278 is a more general and simpler fix for SPARK-16632 than PR #14272. After merging #14278, we no longer need changes made in #14272. So here I revert them.
This PR targets both master and branch-2.0.
How was this patch tested?
Existing tests.