[SPARK-2747] git diff --dirstat can miss sql changes and not run Hive tests #1656
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dev/run-tests use "git diff --dirstat master" to check whether sql is changed. However, --dirstat won't show sql if sql's change is negligible (e.g. 1k loc change in core, and only 1 loc change in hive).
We should use "git diff --name-only master" instead.