[ 
https://issues.apache.org/jira/browse/BEAM-13418?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
 ]

Ritesh Ghorse updated BEAM-13418:
---------------------------------
    Description: 
I'm trying to test the Write transform in XLang JDBC IO  for Go SDK. It throws 
an unknown coder exception.  Below is the small paste of the exact error:
{code:java}
panic: tried cross-language for 
beam:transform:org.apache.beam:schemaio_jdbc_write:v1 against localhost:9000 
and failed
 expanding external transform
 expanding transform with ExpansionRequest: components:{pcollections:{key:"n2"  
value:{unique_name:"n2"  coder_id:"c1@toeuCsZFXN"  is_bounded:BOUNDED  
windowing_strategy_id:"w0@toeuCsZFXN"}}  
windowing_strategies:{key:"w0@toeuCsZFXN"  
value:{window_fn:{urn:"beam:window_fn:global_windows:v1"}  
merge_status:NON_MERGING  window_coder_id:"c2@toeuCsZFXN"  trigger:{default:{}} 
 accumulation_mode:DISCARDING  output_time:END_OF_WINDOW  
closing_behavior:EMIT_IF_NONEMPTY  OnTimeBehavior:FIRE_IF_NONEMPTY  
environment_id:"go"}}  coders:{key:"c0@toeuCsZFXN"  
value:{spec:{urn:"beam:go:coder:custom:v1"  
payload:"CgRqc29uElkIFBJVCBpKUWdpdGh1Yi5jb20vYXBhY2hlL2JlYW0vc2Rrcy92Mi9nby90ZXN0L2ludGVncmF0aW9uL2lvL3hsYW5nL2pkYmMuSmRiY1dyaXRlVGVzdFJvdxpMCjJnaXRodWIuY29tL2FwYWNoZS9iZWFtL3Nka3MvdjIvZ28vcGtnL2JlYW0uanNvbkVuYxIWCBYiBAgZQA8qBggUEgIICCoECBlAASJSCjJnaXRodWIuY29tL2FwYWNoZS9iZWFtL3Nka3MvdjIvZ28vcGtnL2JlYW0uanNvbkRlYxIcCBYiBAgZQAMiBggUEgIICCoECBlADyoECBlAAQ=="}}}
  coders:{key:"c1@toeuCsZFXN"  value:{spec:{urn:"beam:coder:length_prefix:v1"}  
component_coder_ids:"c0@toeuCsZFXN"}}  coders:{key:"c2@toeuCsZFXN"  
value:{spec:{urn:"beam:coder:global_window:v1"}}}  environments:{key:"go"  
value:{}}}  transform:{unique_name:"External"  
spec:{urn:"beam:transform:org.apache.beam:schemaio_jdbc_write:v1"  
payload:"\nX\n\x0e\n\x08location\x1a\x02\x10\x07\n\x0c\n\x06config\x1a\x02\x10\t\n\x12\n\ndataSchema\x1a\x04\x08\x01\x10\t\x12$8947ecef-83d9-4583-9121-03ce158e375c\x12g\x03\x01\x04\x00b\x02\x00\tTestTableU\n\x00\x15org.postgresql.Driver)jdbc:postgresql://192.168.1.11:50387/test\x04test\x04test\x00\x00\x00\x00\x00\x00\x00\x00\x01"}
  inputs:{key:"i0"  value:"n2"}  environment_id:"go"}  namespace:"toeuCsZFXN"
expansion failed
 caused by:
org.apache.beam.vendor.guava.v26_0_jre.com.google.common.util.concurrent.UncheckedExecutionException:
 
org.apache.beam.vendor.guava.v26_0_jre.com.google.common.util.concurrent.UncheckedExecutionException:
 
org.apache.beam.vendor.guava.v26_0_jre.com.google.common.util.concurrent.UncheckedExecutionException:
 java.lang.IllegalArgumentException: Unknown Coder URN beam:go:coder:custom:v1. 
Known URNs: [beam:coder:avro:generic:v1, beam:coder:bytes:v1, 
beam:coder:bool:v1, beam:coder:string_utf8:v1, beam:coder:kv:v1, 
beam:coder:varint:v1, beam:coder:interval_window:v1, beam:coder:iterable:v1, 
beam:coder:timer:v1, beam:coder:length_prefix:v1, beam:coder:global_window:v1, 
beam:coder:windowed_value:v1, beam:coder:param_windowed_value:v1, 
beam:coder:double:v1, beam:coder:row:v1, beam:coder:sharded_key:v1, 
beam:coder:custom_window:v1]
 at 
org.apache.beam.vendor.guava.v26_0_jre.com.google.common.cache.LocalCache$Segment.get(LocalCache.java:2050)
 at 
org.apache.beam.vendor.guava.v26_0_jre.com.google.common.cache.LocalCache.get(LocalCache.java:3952)
 at 
org.apache.beam.vendor.guava.v26_0_jre.com.google.common.cache.LocalCache.getOrLoad(LocalCache.java:3974)
 at 
org.apache.beam.vendor.guava.v26_0_jre.com.google.common.cache.LocalCache$LocalLoadingCache.get(LocalCache.java:4958)
 at 
org.apache.beam.runners.core.construction.RehydratedComponents.getPCollection(RehydratedComponents.java:139)
 at 
org.apache.beam.sdk.expansion.service.ExpansionService.lambda$expand$0(ExpansionService.java:488)
 at 
java.base/java.util.stream.Collectors.lambda$uniqKeysMapAccumulator$1(Collectors.java:178)
 at 
java.base/java.util.stream.ReduceOps$3ReducingSink.accept(ReduceOps.java:169)
 at 
java.base/java.util.Collections$UnmodifiableMap$UnmodifiableEntrySet.lambda$entryConsumer$0(Collections.java:1576)
 at java.base/java.util.Iterator.forEachRemaining(Iterator.java:133)
 at 
java.base/java.util.Spliterators$IteratorSpliterator.forEachRemaining(Spliterators.java:1801)
 at 
java.base/java.util.Collections$UnmodifiableMap$UnmodifiableEntrySet$UnmodifiableEntrySetSpliterator.forEachRemaining(Collections.java:1601)
 at 
java.base/java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:484)
 at 
java.base/java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:474)
 at 
java.base/java.util.stream.ReduceOps$ReduceOp.evaluateSequential(ReduceOps.java:913)
 at 
java.base/java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234)
 at 
java.base/java.util.stream.ReferencePipeline.collect(ReferencePipeline.java:578)
 at 
org.apache.beam.sdk.expansion.service.ExpansionService.expand(ExpansionService.java:483)
 at 
org.apache.beam.sdk.expansion.service.ExpansionService.expand(ExpansionService.java:591)
 at 
org.apache.beam.model.expansion.v1.ExpansionServiceGrpc$MethodHandlers.invoke(ExpansionServiceGrpc.java:219)
 at 
org.apache.beam.vendor.grpc.v1p36p0.io.grpc.stub.ServerCalls$UnaryServerCallHandler$UnaryServerCallListener.onHalfClose(ServerCalls.java:182)
 at 
org.apache.beam.vendor.grpc.v1p36p0.io.grpc.internal.ServerCallImpl$ServerStreamListenerImpl.halfClosed(ServerCallImpl.java:331)
 at 
org.apache.beam.vendor.grpc.v1p36p0.io.grpc.internal.ServerImpl$JumpToApplicationThreadServerStreamListener$1HalfClosed.runInContext(ServerImpl.java:797)
 at 
org.apache.beam.vendor.grpc.v1p36p0.io.grpc.internal.ContextRunnable.run(ContextRunnable.java:37)
 at 
org.apache.beam.vendor.grpc.v1p36p0.io.grpc.internal.SerializingExecutor.run(SerializingExecutor.java:123)
 at 
java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128)
 at 
java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628)
 at java.base/java.lang.Thread.run(Thread.java:829) 

{code}
Prototype PR: https://github.com/apache/beam/pull/16111

  was:
I'm trying to test the Write transform in XLang JDBC IO  for Go SDK. It throws 
an unknown coder exception.  Below is the small paste of the exact error:
{code:java}
panic: tried cross-language for 
beam:transform:org.apache.beam:schemaio_jdbc_write:v1 against localhost:9000 
and failed
 expanding external transform
 expanding transform with ExpansionRequest: components:{pcollections:{key:"n2"  
value:{unique_name:"n2"  coder_id:"c1@toeuCsZFXN"  is_bounded:BOUNDED  
windowing_strategy_id:"w0@toeuCsZFXN"}}  
windowing_strategies:{key:"w0@toeuCsZFXN"  
value:{window_fn:{urn:"beam:window_fn:global_windows:v1"}  
merge_status:NON_MERGING  window_coder_id:"c2@toeuCsZFXN"  trigger:{default:{}} 
 accumulation_mode:DISCARDING  output_time:END_OF_WINDOW  
closing_behavior:EMIT_IF_NONEMPTY  OnTimeBehavior:FIRE_IF_NONEMPTY  
environment_id:"go"}}  coders:{key:"c0@toeuCsZFXN"  
value:{spec:{urn:"beam:go:coder:custom:v1"  
payload:"CgRqc29uElkIFBJVCBpKUWdpdGh1Yi5jb20vYXBhY2hlL2JlYW0vc2Rrcy92Mi9nby90ZXN0L2ludGVncmF0aW9uL2lvL3hsYW5nL2pkYmMuSmRiY1dyaXRlVGVzdFJvdxpMCjJnaXRodWIuY29tL2FwYWNoZS9iZWFtL3Nka3MvdjIvZ28vcGtnL2JlYW0uanNvbkVuYxIWCBYiBAgZQA8qBggUEgIICCoECBlAASJSCjJnaXRodWIuY29tL2FwYWNoZS9iZWFtL3Nka3MvdjIvZ28vcGtnL2JlYW0uanNvbkRlYxIcCBYiBAgZQAMiBggUEgIICCoECBlADyoECBlAAQ=="}}}
  coders:{key:"c1@toeuCsZFXN"  value:{spec:{urn:"beam:coder:length_prefix:v1"}  
component_coder_ids:"c0@toeuCsZFXN"}}  coders:{key:"c2@toeuCsZFXN"  
value:{spec:{urn:"beam:coder:global_window:v1"}}}  environments:{key:"go"  
value:{}}}  transform:{unique_name:"External"  
spec:{urn:"beam:transform:org.apache.beam:schemaio_jdbc_write:v1"  
payload:"\nX\n\x0e\n\x08location\x1a\x02\x10\x07\n\x0c\n\x06config\x1a\x02\x10\t\n\x12\n\ndataSchema\x1a\x04\x08\x01\x10\t\x12$8947ecef-83d9-4583-9121-03ce158e375c\x12g\x03\x01\x04\x00b\x02\x00\tTestTableU\n\x00\x15org.postgresql.Driver)jdbc:postgresql://192.168.1.11:50387/test\x04test\x04test\x00\x00\x00\x00\x00\x00\x00\x00\x01"}
  inputs:{key:"i0"  value:"n2"}  environment_id:"go"}  namespace:"toeuCsZFXN"
expansion failed
 caused by:
org.apache.beam.vendor.guava.v26_0_jre.com.google.common.util.concurrent.UncheckedExecutionException:
 
org.apache.beam.vendor.guava.v26_0_jre.com.google.common.util.concurrent.UncheckedExecutionException:
 
org.apache.beam.vendor.guava.v26_0_jre.com.google.common.util.concurrent.UncheckedExecutionException:
 java.lang.IllegalArgumentException: Unknown Coder URN beam:go:coder:custom:v1. 
Known URNs: [beam:coder:avro:generic:v1, beam:coder:bytes:v1, 
beam:coder:bool:v1, beam:coder:string_utf8:v1, beam:coder:kv:v1, 
beam:coder:varint:v1, beam:coder:interval_window:v1, beam:coder:iterable:v1, 
beam:coder:timer:v1, beam:coder:length_prefix:v1, beam:coder:global_window:v1, 
beam:coder:windowed_value:v1, beam:coder:param_windowed_value:v1, 
beam:coder:double:v1, beam:coder:row:v1, beam:coder:sharded_key:v1, 
beam:coder:custom_window:v1]
 at 
org.apache.beam.vendor.guava.v26_0_jre.com.google.common.cache.LocalCache$Segment.get(LocalCache.java:2050)
 at 
org.apache.beam.vendor.guava.v26_0_jre.com.google.common.cache.LocalCache.get(LocalCache.java:3952)
 at 
org.apache.beam.vendor.guava.v26_0_jre.com.google.common.cache.LocalCache.getOrLoad(LocalCache.java:3974)
 at 
org.apache.beam.vendor.guava.v26_0_jre.com.google.common.cache.LocalCache$LocalLoadingCache.get(LocalCache.java:4958)
 at 
org.apache.beam.runners.core.construction.RehydratedComponents.getPCollection(RehydratedComponents.java:139)
 at 
org.apache.beam.sdk.expansion.service.ExpansionService.lambda$expand$0(ExpansionService.java:488)
 at 
java.base/java.util.stream.Collectors.lambda$uniqKeysMapAccumulator$1(Collectors.java:178)
 at 
java.base/java.util.stream.ReduceOps$3ReducingSink.accept(ReduceOps.java:169)
 at 
java.base/java.util.Collections$UnmodifiableMap$UnmodifiableEntrySet.lambda$entryConsumer$0(Collections.java:1576)
 at java.base/java.util.Iterator.forEachRemaining(Iterator.java:133)
 at 
java.base/java.util.Spliterators$IteratorSpliterator.forEachRemaining(Spliterators.java:1801)
 at 
java.base/java.util.Collections$UnmodifiableMap$UnmodifiableEntrySet$UnmodifiableEntrySetSpliterator.forEachRemaining(Collections.java:1601)
 at 
java.base/java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:484)
 at 
java.base/java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:474)
 at 
java.base/java.util.stream.ReduceOps$ReduceOp.evaluateSequential(ReduceOps.java:913)
 at 
java.base/java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234)
 at 
java.base/java.util.stream.ReferencePipeline.collect(ReferencePipeline.java:578)
 at 
org.apache.beam.sdk.expansion.service.ExpansionService.expand(ExpansionService.java:483)
 at 
org.apache.beam.sdk.expansion.service.ExpansionService.expand(ExpansionService.java:591)
 at 
org.apache.beam.model.expansion.v1.ExpansionServiceGrpc$MethodHandlers.invoke(ExpansionServiceGrpc.java:219)
 at 
org.apache.beam.vendor.grpc.v1p36p0.io.grpc.stub.ServerCalls$UnaryServerCallHandler$UnaryServerCallListener.onHalfClose(ServerCalls.java:182)
 at 
org.apache.beam.vendor.grpc.v1p36p0.io.grpc.internal.ServerCallImpl$ServerStreamListenerImpl.halfClosed(ServerCallImpl.java:331)
 at 
org.apache.beam.vendor.grpc.v1p36p0.io.grpc.internal.ServerImpl$JumpToApplicationThreadServerStreamListener$1HalfClosed.runInContext(ServerImpl.java:797)
 at 
org.apache.beam.vendor.grpc.v1p36p0.io.grpc.internal.ContextRunnable.run(ContextRunnable.java:37)
 at 
org.apache.beam.vendor.grpc.v1p36p0.io.grpc.internal.SerializingExecutor.run(SerializingExecutor.java:123)
 at 
java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128)
 at 
java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628)
 at java.base/java.lang.Thread.run(Thread.java:829) 

{code}
Prototype PR: 


> Xlang JDBC IO for Go SDK throws Unkown coder error in Write transform for 
> Java Exapansion Service.
> --------------------------------------------------------------------------------------------------
>
>                 Key: BEAM-13418
>                 URL: https://issues.apache.org/jira/browse/BEAM-13418
>             Project: Beam
>          Issue Type: Bug
>          Components: sdk-go, sdk-java-core
>            Reporter: Ritesh Ghorse
>            Priority: P3
>
> I'm trying to test the Write transform in XLang JDBC IO  for Go SDK. It 
> throws an unknown coder exception.  Below is the small paste of the exact 
> error:
> {code:java}
> panic: tried cross-language for 
> beam:transform:org.apache.beam:schemaio_jdbc_write:v1 against localhost:9000 
> and failed
>  expanding external transform
>  expanding transform with ExpansionRequest: 
> components:{pcollections:{key:"n2"  value:{unique_name:"n2"  
> coder_id:"c1@toeuCsZFXN"  is_bounded:BOUNDED  
> windowing_strategy_id:"w0@toeuCsZFXN"}}  
> windowing_strategies:{key:"w0@toeuCsZFXN"  
> value:{window_fn:{urn:"beam:window_fn:global_windows:v1"}  
> merge_status:NON_MERGING  window_coder_id:"c2@toeuCsZFXN"  
> trigger:{default:{}}  accumulation_mode:DISCARDING  output_time:END_OF_WINDOW 
>  closing_behavior:EMIT_IF_NONEMPTY  OnTimeBehavior:FIRE_IF_NONEMPTY  
> environment_id:"go"}}  coders:{key:"c0@toeuCsZFXN"  
> value:{spec:{urn:"beam:go:coder:custom:v1"  
> payload:"CgRqc29uElkIFBJVCBpKUWdpdGh1Yi5jb20vYXBhY2hlL2JlYW0vc2Rrcy92Mi9nby90ZXN0L2ludGVncmF0aW9uL2lvL3hsYW5nL2pkYmMuSmRiY1dyaXRlVGVzdFJvdxpMCjJnaXRodWIuY29tL2FwYWNoZS9iZWFtL3Nka3MvdjIvZ28vcGtnL2JlYW0uanNvbkVuYxIWCBYiBAgZQA8qBggUEgIICCoECBlAASJSCjJnaXRodWIuY29tL2FwYWNoZS9iZWFtL3Nka3MvdjIvZ28vcGtnL2JlYW0uanNvbkRlYxIcCBYiBAgZQAMiBggUEgIICCoECBlADyoECBlAAQ=="}}}
>   coders:{key:"c1@toeuCsZFXN"  
> value:{spec:{urn:"beam:coder:length_prefix:v1"}  
> component_coder_ids:"c0@toeuCsZFXN"}}  coders:{key:"c2@toeuCsZFXN"  
> value:{spec:{urn:"beam:coder:global_window:v1"}}}  environments:{key:"go"  
> value:{}}}  transform:{unique_name:"External"  
> spec:{urn:"beam:transform:org.apache.beam:schemaio_jdbc_write:v1"  
> payload:"\nX\n\x0e\n\x08location\x1a\x02\x10\x07\n\x0c\n\x06config\x1a\x02\x10\t\n\x12\n\ndataSchema\x1a\x04\x08\x01\x10\t\x12$8947ecef-83d9-4583-9121-03ce158e375c\x12g\x03\x01\x04\x00b\x02\x00\tTestTableU\n\x00\x15org.postgresql.Driver)jdbc:postgresql://192.168.1.11:50387/test\x04test\x04test\x00\x00\x00\x00\x00\x00\x00\x00\x01"}
>   inputs:{key:"i0"  value:"n2"}  environment_id:"go"}  namespace:"toeuCsZFXN"
> expansion failed
>  caused by:
> org.apache.beam.vendor.guava.v26_0_jre.com.google.common.util.concurrent.UncheckedExecutionException:
>  
> org.apache.beam.vendor.guava.v26_0_jre.com.google.common.util.concurrent.UncheckedExecutionException:
>  
> org.apache.beam.vendor.guava.v26_0_jre.com.google.common.util.concurrent.UncheckedExecutionException:
>  java.lang.IllegalArgumentException: Unknown Coder URN 
> beam:go:coder:custom:v1. Known URNs: [beam:coder:avro:generic:v1, 
> beam:coder:bytes:v1, beam:coder:bool:v1, beam:coder:string_utf8:v1, 
> beam:coder:kv:v1, beam:coder:varint:v1, beam:coder:interval_window:v1, 
> beam:coder:iterable:v1, beam:coder:timer:v1, beam:coder:length_prefix:v1, 
> beam:coder:global_window:v1, beam:coder:windowed_value:v1, 
> beam:coder:param_windowed_value:v1, beam:coder:double:v1, beam:coder:row:v1, 
> beam:coder:sharded_key:v1, beam:coder:custom_window:v1]
>  at 
> org.apache.beam.vendor.guava.v26_0_jre.com.google.common.cache.LocalCache$Segment.get(LocalCache.java:2050)
>  at 
> org.apache.beam.vendor.guava.v26_0_jre.com.google.common.cache.LocalCache.get(LocalCache.java:3952)
>  at 
> org.apache.beam.vendor.guava.v26_0_jre.com.google.common.cache.LocalCache.getOrLoad(LocalCache.java:3974)
>  at 
> org.apache.beam.vendor.guava.v26_0_jre.com.google.common.cache.LocalCache$LocalLoadingCache.get(LocalCache.java:4958)
>  at 
> org.apache.beam.runners.core.construction.RehydratedComponents.getPCollection(RehydratedComponents.java:139)
>  at 
> org.apache.beam.sdk.expansion.service.ExpansionService.lambda$expand$0(ExpansionService.java:488)
>  at 
> java.base/java.util.stream.Collectors.lambda$uniqKeysMapAccumulator$1(Collectors.java:178)
>  at 
> java.base/java.util.stream.ReduceOps$3ReducingSink.accept(ReduceOps.java:169)
>  at 
> java.base/java.util.Collections$UnmodifiableMap$UnmodifiableEntrySet.lambda$entryConsumer$0(Collections.java:1576)
>  at java.base/java.util.Iterator.forEachRemaining(Iterator.java:133)
>  at 
> java.base/java.util.Spliterators$IteratorSpliterator.forEachRemaining(Spliterators.java:1801)
>  at 
> java.base/java.util.Collections$UnmodifiableMap$UnmodifiableEntrySet$UnmodifiableEntrySetSpliterator.forEachRemaining(Collections.java:1601)
>  at 
> java.base/java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:484)
>  at 
> java.base/java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:474)
>  at 
> java.base/java.util.stream.ReduceOps$ReduceOp.evaluateSequential(ReduceOps.java:913)
>  at 
> java.base/java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234)
>  at 
> java.base/java.util.stream.ReferencePipeline.collect(ReferencePipeline.java:578)
>  at 
> org.apache.beam.sdk.expansion.service.ExpansionService.expand(ExpansionService.java:483)
>  at 
> org.apache.beam.sdk.expansion.service.ExpansionService.expand(ExpansionService.java:591)
>  at 
> org.apache.beam.model.expansion.v1.ExpansionServiceGrpc$MethodHandlers.invoke(ExpansionServiceGrpc.java:219)
>  at 
> org.apache.beam.vendor.grpc.v1p36p0.io.grpc.stub.ServerCalls$UnaryServerCallHandler$UnaryServerCallListener.onHalfClose(ServerCalls.java:182)
>  at 
> org.apache.beam.vendor.grpc.v1p36p0.io.grpc.internal.ServerCallImpl$ServerStreamListenerImpl.halfClosed(ServerCallImpl.java:331)
>  at 
> org.apache.beam.vendor.grpc.v1p36p0.io.grpc.internal.ServerImpl$JumpToApplicationThreadServerStreamListener$1HalfClosed.runInContext(ServerImpl.java:797)
>  at 
> org.apache.beam.vendor.grpc.v1p36p0.io.grpc.internal.ContextRunnable.run(ContextRunnable.java:37)
>  at 
> org.apache.beam.vendor.grpc.v1p36p0.io.grpc.internal.SerializingExecutor.run(SerializingExecutor.java:123)
>  at 
> java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128)
>  at 
> java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628)
>  at java.base/java.lang.Thread.run(Thread.java:829) 
> {code}
> Prototype PR: https://github.com/apache/beam/pull/16111



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