Github user yanbohappy commented on the pull request:
https://github.com/apache/spark/pull/4527#issuecomment-74388397
@yhuai
This improvement is very similar with #758, so I have leverage the
performance test there.
The benchmark suggests this optimization made the optimized version 1.5x
faster when scanning JSON table, but it's not very stable.
For a json file with 188010 lines, the build scan consumed time is:
original: Takes 15598 ms
optimized: Takes 10152 ms
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