prodriguezdefino commented on code in PR #32512:
URL: https://github.com/apache/beam/pull/32512#discussion_r1801863931


##########
sdks/java/io/google-cloud-platform/src/main/java/org/apache/beam/sdk/io/gcp/bigquery/BeamRowToStorageApiProto.java:
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@@ -272,6 +286,8 @@ private static Object messageValueFromRowValue(
     if (value == null) {
       if (fieldDescriptor.isOptional()) {
         return null;
+      } else if (fieldDescriptor.isRepeated()) {

Review Comment:
   Keeping the return value as null. 
   
   It seems that the previous code will fail in the case of having a schema 
with a simple array of strings as a field and marking it as nullable. By adding 
this check here it also fixes that case. Adding a test to check those 
particularities. 



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