dongjoon-hyun commented on issue #24043: [SPARK-11412][SQL] Support merge schema for ORC URL: https://github.com/apache/spark/pull/24043#issuecomment-496347909 Lastly, it would be great if you can add some performance comparisons between Parquet/ORC merge schema in the PR description. This PR aims to add new features for ORC/Parquet feature parity. So, if there is a big slowness on new code, it's not desirable.
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