yanlin-Lynn opened a new pull request #1634: [CALCITE-3246] NullPointerException while deserializing udf operator URL: https://github.com/apache/calcite/pull/1634 The class of udf was lost in the pr [CALCITE-3177](https://github.com/apache/calcite/pull/1305), causing an NullPointerException when deserializing of udf operator. In this pr, add class info to the map parameter for deserializing operator, and remove unused function parameter. This is a re-create PR of https://github.com/apache/calcite/pull/1372, and please see more discussion in jira [CALCITE-3246](https://issues.apache.org/jira/browse/CALCITE-3246)
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