Github user yanbohappy commented on the pull request:
https://github.com/apache/spark/pull/4527#issuecomment-74424908
This improvement is very similar with #758, so I have run the similar
performance test.
The benchmark suggests this optimization made the optimized version about
1.5x to 2x faster when scanning JSON table, but it depends on the JSON schema
especially for whether different record with different schema.
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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