Github user viirya commented on the pull request:
https://github.com/apache/spark/pull/10571#issuecomment-168642023
lib directory is "." by default, if you are asking for that?
ANTLR looks for imported grammar files (not generated .java files which are
located with .tokens in same path now) in lib directory. Even if we set lib
directory to where ANTLR writes .tokens files, it doesn't work because it can't
find imported grammar files.
So ANTLR will not know imported grammar files are updated and will not
rebuild SparkSqlParser.g.
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