Github user HyukjinKwon commented on the issue:
https://github.com/apache/spark/pull/22688
cc @cloud-fan and @rdblue, this is more conservative but I would prefer to
revert it at https://github.com/apache/spark/pull/22686 rather then exposing
append mode in 2.4. I don't think it's a great idea read code paths are
executed in write path.
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