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https://issues.apache.org/jira/browse/BEAM-12509?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Andrew Pilloud updated BEAM-12509:
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Status: Open (was: Triage Needed)
> 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
> Priority: P2
>
> 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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