Github user liancheng commented on the pull request:
https://github.com/apache/spark/pull/9940#issuecomment-160544801
@yhuai Here is the background: Parquet filter push-down is disabled when
schema merging is turned on because of [PARQUET-389][1].
I'm somewhat hesitant to have this change. On one hand, I do want to have
filter push-down in case of schema merging since it's generally a very useful
optimization. On the other hand, this change is a little bit hacky, since
schema metadata is not intended to be used in this way.
Anyway, at least, let's have two more updates for this PR:
1. Rename `oneSide` to something more intuitive
1. Schema metadata is persisted together with the schema, this temporary
metadata entry should be cleared before saving the Parquet file.
[1]: https://issues.apache.org/jira/browse/PARQUET-389
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