Jan Lukavský created BEAM-12473:
-----------------------------------
Summary: 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
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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