Github user holdenk commented on the pull request:
https://github.com/apache/spark/pull/12533#issuecomment-212598145
So, just something to consider, looking at the pipeline code, it seems that
calling transform on the entire pipeline will call transform schema on each
pipeline stage. If we also do transformSchema inside of each transform on each
pipeline stage as well we will be doing validation multiple times for each
stage. CC @MLnick & @jkbradley for thoughts/comments.
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