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Commit 70fe6ce5 authored by Davies Liu's avatar Davies Liu Committed by Davies Liu
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[SPARK-12659] fix NPE in UnsafeExternalSorter (used by cartesian product) 

Cartesian product use UnsafeExternalSorter without comparator to do spilling, it will NPE if spilling happens.

This bug also hitted by #10605

cc JoshRosen

Author: Davies Liu <davies@databricks.com>

Closes #10606 from davies/fix_spilling.
parent 0d42292f
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