yux created FLINK-35986:
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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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