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Posted to dev@flink.apache.org by "yux (Jira)" <ji...@apache.org> on 2024/08/06 06:02:00 UTC

[jira] [Created] (FLINK-35986) NULL literal is not supported in Transform rules

yux created FLINK-35986:
---------------------------

             Summary: NULL literal is not supported in Transform rules
                 Key: FLINK-35986
                 URL: https://issues.apache.org/jira/browse/FLINK-35986
             Project: Flink
          Issue Type: Bug
          Components: Flink CDC
            Reporter: yux


Sometimes one may want to explicitly write down a NULL value, for example in some CASE - WHEN branches or when calling some UDF functions. However, it is not possible to write down such expressions, and an exception will be thrown:

Caused by: java.lang.UnsupportedOperationException: Unsupported type: NULL
	at org.apache.flink.cdc.runtime.typeutils.DataTypeConverter.convertCalciteRelDataTypeToDataType(DataTypeConverter.java:181)
	at org.apache.flink.cdc.runtime.parser.TransformParser.generateProjectionColumns(TransformParser.java:189)
   ...



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