rubenada opened a new pull request #1833: [CALCITE-3828] MergeJoin throws NPE in case of null keys URL: https://github.com/apache/calcite/pull/1833 Jira ticket: [CALCITE-3828](https://issues.apache.org/jira/browse/CALCITE-3828) EnumerableDefaults#MergeJoinEnumerator throws a NPE in case of null keys. MergeJoin algorithm assumes that inputs sorted in ascending order, with nulls last (see EnumerableMergeJoinRule), so when reaching a null key on the left / right side means that we are done.
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