voonhous commented on code in PR #20326:
URL: https://github.com/apache/hudi/pull/20326#discussion_r4281843768


##########
hudi-spark-datasource/hudi-spark4-common/src/main/java/org/apache/hudi/variant/Spark4VariantShreddingProvider.java:
##########
@@ -176,7 +176,16 @@ private VariantSchema buildVariantSchema(Schema 
avroSchema, boolean isTopLevel,
           break;
 
         default:
-          // Scalar shredding
+          // Scalar shredding. On write (non-null builder), reject leaf types 
Spark 4 cannot shred,
+          // as SparkShreddingUtils.buildVariantSchema does with 
invalidVariantShreddingSchema.
+          if (builder != null && !isSparkShreddableScalar(tvSchema)) {
+            LogicalType logicalType = tvSchema.getLogicalType();
+            String typeName = tvSchema.getType().getName()
+                + (logicalType == null ? "" : " (" + logicalType.getName() + 
")");
+            throw new HoodieException("Variant shredding schema has a 
typed_value of type " + typeName

Review Comment:
   Addressed.



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