Github user zhzhan commented on the pull request:
https://github.com/apache/spark/pull/6194#issuecomment-102526125
@liancheng FYI: For schema merging, I checked some orc experts, and
probably it is not supported the filter push down if the column is not in that
specific orc file (I myself does not check the implementation yet). In the
meantime, separating orc from hive is a on-going effort. We can separate orc
from hive afterwards, and upgrade orc support to latest, which I think will
improve the performance and a lot and remove potential version mismatch due to
hive versions.
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