Github user viirya commented on the pull request:
https://github.com/apache/spark/pull/7154#issuecomment-122658276
@liancheng thanks for commenting. I've noticed #7396 and I think it will
bring great improvement to parquet performance.
In fact I have also submitted another PR #7238 to improve parquet schema
merging performance. As I tested, it can improve much the performance. #7238
can be a complement to #7396 as well, but it may have much more conflicts with
#7396. So I will refactor it after #7396 is getting merged.
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