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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