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https://issues.apache.org/jira/browse/BEAM-3325?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Beam JIRA Bot updated BEAM-3325:
--------------------------------
    Labels:   (was: stale-P2)

> optional parameter is not supported in BeamSQL
> ----------------------------------------------
>
>                 Key: BEAM-3325
>                 URL: https://issues.apache.org/jira/browse/BEAM-3325
>             Project: Beam
>          Issue Type: Bug
>          Components: dsl-sql
>            Reporter: Mingmin Xu
>            Priority: P3
>
> I'm wring a UDF with optional parameters, the method code is:
> {code}
>   public static String eval(String kvString, String keyName
>       , @Parameter(name = "pd", optional = true) String pairSeperator
>       , @Parameter(name = "kvd", optional = true) String kvSeperator){
>     //...
>   }
> {code}
> And I see this error when assembling a Beam pipeline:
> {code}
> 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)
> {code}



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