Github user oliviertoupin commented on the pull request:
https://github.com/apache/spark/pull/7664#issuecomment-130816874
I could open a bug for this, but this PR, along with a small change in
newParquet.scala to use metastore schema before using "readSchema()" fix a
major or critical bug. This fix a long hang in the driver while querying a
table with a lots of files.
This problem is described in several issues related to metastore, hive, and
parquet.
FYI, I merged this in our dev branch to replace our custom (and very
similar) fix, with great success.
If we don't merge this we just at least document the issue, so 1.4.2 users
could merge this if they experience the problem.
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