reuvenlax commented on a change in pull request #16558:
URL: https://github.com/apache/beam/pull/16558#discussion_r788071462



##########
File path: model/pipeline/src/main/proto/schema.proto
##########
@@ -31,6 +31,11 @@ option go_package = 
"github.com/apache/beam/sdks/v2/go/pkg/beam/model/pipeline_v
 option java_package = "org.apache.beam.model.pipeline.v1";
 option java_outer_classname = "SchemaApi";
 
+message SchemaCoderPayload {
+  Schema schema = 1;
+  map<string, bytes> sdk_information = 2;

Review comment:
       Probably, why? Are you asking why it's a map? That was simply to make it 
simpler for the producing SDK to attach multiple items (in this case 
typeDescriptor, toRowFn, and fromRowFn)




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