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https://issues.apache.org/jira/browse/BEAM-12473?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Jan Lukavský updated BEAM-12473:
--------------------------------
Fix Version/s: 2.32.0
Resolution: Fixed
Status: Resolved (was: Open)
> ClassCastException when using registerUdaf in Calcite SQL
> ---------------------------------------------------------
>
> Key: BEAM-12473
> URL: https://issues.apache.org/jira/browse/BEAM-12473
> Project: Beam
> Issue Type: Bug
> Components: dsl-sql
> Affects Versions: 2.31.0
> Reporter: Jan Lukavský
> Assignee: Jan Lukavský
> Priority: P2
> Fix For: 2.32.0
>
> Time Spent: 1h 40m
> Remaining Estimate: 0h
>
> When using {{registerUdaf}} as follows:
> {code:java}
> .registerUdaf(
> "LONGEST_WORD",
> Max.of(
> (Comparator<String> & Serializable)
> (String a, String b) ->
> Integer.compare(a.length(), b.length()))))
> {code}
> results in following exception:
> {noformat}
> Caused by: java.lang.ClassCastException: class
> sun.reflect.generics.reflectiveObjects.TypeVariableImpl cannot be cast to
> class java.lang.Class
> (sun.reflect.generics.reflectiveObjects.TypeVariableImpl and java.lang.Class
> are in module java.base of loader 'bootstrap')
> at
> org.apache.beam.sdk.extensions.sql.impl.utils.CalciteUtils.sqlTypeWithAutoCast(CalciteUtils.java:327)
> at
> org.apache.beam.sdk.extensions.sql.impl.UdafImpl$1.getType(UdafImpl.java:73)
> at
> org.apache.beam.vendor.calcite.v1_20_0.org.apache.calcite.prepare.CalciteCatalogReader.toOp(CalciteCatalogReader.java:315)
> at
> org.apache.beam.vendor.calcite.v1_20_0.org.apache.calcite.prepare.CalciteCatalogReader.toOp(CalciteCatalogReader.java:302)
> at
> org.apache.beam.vendor.calcite.v1_20_0.org.apache.calcite.prepare.CalciteCatalogReader.lambda$lookupOperatorOverloads$3(CalciteCatalogReader.java:271)
> at
> java.base/java.util.stream.ReferencePipeline$3$1.accept(ReferencePipeline.java:195)
> at
> java.base/java.util.stream.ReferencePipeline$2$1.accept(ReferencePipeline.java:177)
> {noformat}
> If this way of registering UDAF is not supported, it should throw a more
> user-friendly exception.
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