Description
When using registerUdaf as follows:
.registerUdaf( "LONGEST_WORD", Max.of( (Comparator<String> & Serializable) (String a, String b) -> Integer.compare(a.length(), b.length()))))
results in following exception:
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)
If this way of registering UDAF is not supported, it should throw a more user-friendly exception.
Attachments
Issue Links
- duplicates
-
BEAM-11059 Cannot use generic class as UDAF implementation.
- Resolved
- links to