kennknowles opened a new issue, #18672:
URL: https://github.com/apache/beam/issues/18672
I'm wring a UDF with optional parameters, the method code is:
```
public static String eval(String kvString, String keyName
, @Parameter(name = "pd", optional
= true) String pairSeperator
, @Parameter(name = "kvd", optional = true) String kvSeperator){
//...
}
```
And I see this error when assembling a Beam pipeline:
```
Execution Plan:
BeamProjectRel(ITEM_ID=[CAST(KV_EXT($0, 'itemId', DEFAULT(),
DEFAULT())):BIGINT],
TRANSACTION_ID=[CAST(KV_EXT($0, 'transactionId', DEFAULT(),
DEFAULT())):BIGINT], TRANSACTION_TIME=[KV_EXT($0,
'createdDT', DEFAULT(), DEFAULT())])
BeamIOSourceRel(table=[[....]])
Exception in thread "main"
java.lang.RuntimeException: java.lang.UnsupportedOperationException:
Operator: DEFAULT is not supported
yet!
at .........
Caused by: java.lang.UnsupportedOperationException: Operator: DEFAULT is not
supported
yet!
at
org.apache.beam.sdk.extensions.sql.impl.interpreter.BeamSqlFnExecutor.buildExpression(BeamSqlFnExecutor.java:425)
at
org.apache.beam.sdk.extensions.sql.impl.interpreter.BeamSqlFnExecutor.buildExpression(BeamSqlFnExecutor.java:202)
at
org.apache.beam.sdk.extensions.sql.impl.interpreter.BeamSqlFnExecutor.buildExpression(BeamSqlFnExecutor.java:202)
at
org.apache.beam.sdk.extensions.sql.impl.interpreter.BeamSqlFnExecutor.<init>(BeamSqlFnExecutor.java:126)
at
org.apache.beam.sdk.extensions.sql.impl.rel.BeamProjectRel.buildBeamPipeline(BeamProjectRel.java:70)
at
org.apache.beam.sdk.extensions.sql.impl.planner.BeamQueryPlanner.compileBeamPipeline(BeamQueryPlanner.java:116)
at
org.apache.beam.sdk.extensions.sql.BeamSqlCli.compilePipeline(BeamSqlCli.java:112)
```
Imported from Jira
[BEAM-3325](https://issues.apache.org/jira/browse/BEAM-3325). Original Jira may
contain additional context.
Reported by: mingmxu.
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