Github user srowen commented on the issue:
https://github.com/apache/spark/pull/15553
For development time, use an IDE or maybe SBT to do incremental
compilation, which is even faster. I don't otherwise see a strong use case for
not compiling tests. Yes it's slower to compile tests, but not slow compared to
running them, and the downside is missing compile errors and the extra
complexity of an already creaking build.
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