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https://issues.apache.org/jira/browse/BEAM-12108?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17340956#comment-17340956
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Kyle Weaver commented on BEAM-12108:
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This one will be difficult because we don't have any way of passing in the
expected Schema of the Row return type or argument, and without the Schema we
can't infer a SQL type signature from the Java method. But this only affects
the SqlTransform path – CREATE FUNCTION shouldn't have a problem, because the
user must specify the full type signature in the query.
> Support STRUCT type in BeamJavaUdfCalcRule.
> -------------------------------------------
>
> Key: BEAM-12108
> URL: https://issues.apache.org/jira/browse/BEAM-12108
> Project: Beam
> Issue Type: New Feature
> Components: dsl-sql-zetasql
> Reporter: Kyle Weaver
> Priority: P2
> Labels: zetasql-java-udf
>
> We want the STRUCT ZetaSQL type to correspond to
> org.apache.beam.sdk.values.Row in Java UDFs. But the type inference logic
> doesn't know how to create a Calcite struct type from a Row yet.
> https://github.com/apache/beam/blob/master/sdks/java/extensions/sql/src/main/java/org/apache/beam/sdk/extensions/sql/impl/utils/CalciteUtils.java#L288
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