HeartSaVioR opened a new pull request #25753: [SPARK-29046] Fix NPE in SQLConf.get when active SparkContext is stopping URL: https://github.com/apache/spark/pull/25753 # What changes were proposed in this pull request? This patch fixes the bug regarding NPE in SQLConf.get, which is only possible when SparkContext._dagScheduler is null due to stopping SparkContext. The logic doesn't seem to consider active SparkContext could be in progress of stopping. Note that it can't be encountered easily as `SparkContext.stop()` blocks the main thread, but there're some cases where users run another threads, and listener is accessing SQLConf.get after dagScheduler is set to null (this is the case what I encountered.) ### Why are the changes needed? The bug brings NPE. ### Does this PR introduce any user-facing change? No. ### How was this patch tested? Added new UT to verify NPE doesn't occur. Without patch, the test fails with throwing NPE.
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