Github user feynmanliang commented on the pull request:
https://github.com/apache/spark/pull/8534#issuecomment-140182675
I believe the `copy` overrides were added by [this
commit](https://github.com/taishi-oss/spark/commit/43c7ec6384e51105dedf3a53354b6a3732cc27b2)
which went in to 1.5, not 1.4.1. SPARK-7751 has detailed directions on how to
use the git history to identify the correct version numbers. You could also
look at git blames and histories to figure out the exact commit that introduced
it.
you should add annotations to all public methods and constructor parameters
(i.e. to `val`s if they are parameters in a public constructor).
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