HeartSaVioR edited a comment on issue #25913: [WIP][SPARK-29221][SQL] LocalTableScanExec: handle the case where executors are accessing "null" rows URL: https://github.com/apache/spark/pull/25913#issuecomment-534782959 I'm wondering why the test fails intermittently, as the stack trace should always bring NPE. My bet is that it goes to the conditional case and trigger this. ~~I'll try to add some more band-aids, but~~ honestly experts are needed to deep dive into the root cause. EDIT: `sqlContext` and `sparkContext` are being used from so many plans without any checking with null, which would just throw NPE if expressions are executed in executor side. It's not possible to determine all the cases to classify whether they are called in driver and/or executor - even we classify once for now, it can be easily broken again. Finding root cause seems to be required.
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