damondouglas commented on code in PR #26394:
URL: https://github.com/apache/beam/pull/26394#discussion_r1174509493
##########
sdks/java/io/file-schema-transform/src/main/java/org/apache/beam/sdk/io/fileschematransform/FileWriteTransformRegistrar.java:
##########
@@ -0,0 +1,40 @@
+package org.apache.beam.sdk.io.fileschematransform;
+
+import com.google.auto.service.AutoService;
+import org.apache.beam.sdk.expansion.ExternalTransformRegistrar;
+import org.apache.beam.sdk.options.PipelineOptions;
+import org.apache.beam.sdk.transforms.ExternalTransformBuilder;
+import org.apache.beam.sdk.transforms.PTransform;
+import org.apache.beam.sdk.values.PCollectionRowTuple;
+import
org.apache.beam.vendor.guava.v26_0_jre.com.google.common.collect.ImmutableMap;
+import org.checkerframework.checker.initialization.qual.Initialized;
+import org.checkerframework.checker.nullness.qual.NonNull;
+import org.checkerframework.checker.nullness.qual.UnknownKeyFor;
+
+import java.util.List;
+import java.util.Map;
+import java.util.Optional;
+
+@AutoService(ExternalTransformRegistrar.class)
+public class FileWriteTransformRegistrar implements ExternalTransformRegistrar
{
Review Comment:
This resolves:
```
java.lang.UnsupportedOperationException: Unknown urn:
beam:schematransform:org.apache.beam:file_write:v1
at
org.apache.beam.sdk.expansion.service.ExpansionService.expand(ExpansionService.java:517)
at
org.apache.beam.sdk.expansion.service.ExpansionService.expand(ExpansionService.java:606)
at
org.apache.beam.model.expansion.v1.ExpansionServiceGrpc$MethodHandlers.invoke(ExpansionServiceGrpc.java:306)
at
org.apache.beam.vendor.grpc.v1p54p0.io.grpc.stub.ServerCalls$UnaryServerCallHandler$UnaryServerCallListener.onHalfClose(ServerCalls.java:182)
at
org.apache.beam.vendor.grpc.v1p54p0.io.grpc.internal.ServerCallImpl$ServerStreamListenerImpl.halfClosed(ServerCallImpl.java:355)
at
org.apache.beam.vendor.grpc.v1p54p0.io.grpc.internal.ServerImpl$JumpToApplicationThreadServerStreamListener$1HalfClosed.runInContext(ServerImpl.java:867)
at
org.apache.beam.vendor.grpc.v1p54p0.io.grpc.internal.ContextRunnable.run(ContextRunnable.java:37)
at
org.apache.beam.vendor.grpc.v1p54p0.io.grpc.internal.SerializingExecutor.run(SerializingExecutor.java:133)
at
java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128)
at
java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628)
at java.base/java.lang.Thread.run(Thread.java:829)
```
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