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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