Kyle Weaver created BEAM-12509:
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Summary: AggregateFn: only accumulator types with default coders
are supported.
Key: BEAM-12509
URL: https://issues.apache.org/jira/browse/BEAM-12509
Project: Beam
Issue Type: Bug
Components: dsl-sql-zetasql
Reporter: Kyle Weaver
AggregateFn infers the coder for the accumulator from its type [1]. This only
works for types with default coders registered [2].
To enable the use custom coders, AggregateFn will need a method to set the
accumulator coder. However, the Coder class itself is a part of the Beam core
SDK, a dependency we were trying to avoid in
org.apache.beam.sdk.extensions.sql.udf.
[1]
https://github.com/apache/beam/blob/9418994e11dbede889b508c91261ec2092f2d8a7/sdks/java/extensions/sql/src/main/java/org/apache/beam/sdk/extensions/sql/impl/LazyAggregateCombineFn.java#L88
[2]
https://github.com/apache/beam/blob/9418994e11dbede889b508c91261ec2092f2d8a7/sdks/java/core/src/main/java/org/apache/beam/sdk/coders/CoderRegistry.java#L106-L143
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