Github user jkbradley commented on the pull request:
https://github.com/apache/spark/pull/6894#issuecomment-117349301
I guess it should have been "DiscreteCosineTransform" (without the "er").
I'm OK with shortening it to DCT. I'd vote for DCT. If we add a 2D version,
we can call that DCT2D. (Or DCT could be generalized to support Matrix as
input.)
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