Github user jacques-n commented on the pull request:
https://github.com/apache/drill/pull/333#issuecomment-173683725
Fair question. For the first year the codebase only generated these files
at build time (no check-in). In this situation newcomers had to install the
right version of protoc. This turned into the single biggest issue on the dev
list to new contributors. As such, we finally relented and committed the
compiled code. (In general, the problem is that if brew/macports installs the
wrong version, people get strange maven compilation problems that are
non-obvious).
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