yanlin-Lynn opened a new pull request #1433: [CALCITE-3316] Exception while deserializing LogicalCorrelate from json string URL: https://github.com/apache/calcite/pull/1433 `NullPointerException` and `ClassCastException` may happen while deserializing LogicalCorrelate from json string. Please refer to [CALCITE-3316](https://issues.apache.org/jira/browse/CALCITE-3316) for the full stack trace of the exception. This PR tries to fix it.
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