yanlin-Lynn opened a new pull request #1642: [CALCITE-3583] Support serialized to json and deserialized from json for Exchange relation operator URL: https://github.com/apache/calcite/pull/1642 Currently, serialize Exchange relnode to json will cause exception, please refer to jira: [CALCITE-3583](https://issues.apache.org/jira/browse/CALCITE-3583) for more details. This pr tries to support serialized to json and deserialized from json for Exchange relnode.
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