amaliujia commented on code in PR #40109:
URL: https://github.com/apache/spark/pull/40109#discussion_r1114859538


##########
connector/connect/common/src/main/protobuf/spark/connect/commands.proto:
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@@ -128,7 +128,7 @@ message WriteOperationV2 {
 
   // (Optional) A provider for the underlying output data source. Spark's 
default catalog supports
   // "parquet", "json", etc.
-  string provider = 3;
+  optional string provider = 3;

Review Comment:
   Sorry I actually miss-remember this: the complete  dropping `optional` is 
still a proposal but not finalized yet. This line is good.



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