amaliujia commented on code in PR #45316:
URL: https://github.com/apache/spark/pull/45316#discussion_r1506639369


##########
python/pyspark/sql/connect/types.py:
##########
@@ -139,7 +139,7 @@ def pyspark_types_to_proto_types(data_type: DataType) -> 
pb2.DataType:
     if isinstance(data_type, NullType):
         ret.null.CopyFrom(pb2.DataType.NULL())
     elif isinstance(data_type, StringType):
-        ret.string.CopyFrom(pb2.DataType.String())
+        ret.string.collation_id = data_type.collationId

Review Comment:
   Is this change tested? The added UT seems to test proto -> type conversion 
but not vice verse? 



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