xxlaykxx commented on code in PR #837:
URL: https://github.com/apache/arrow-java/pull/837#discussion_r2336484952


##########
vector/src/main/java/org/apache/arrow/vector/BaseValueVector.java:
##########
@@ -260,6 +261,18 @@ public void copyFromSafe(int fromIndex, int thisIndex, 
ValueVector from) {
     throw new UnsupportedOperationException();
   }
 
+  @Override
+  public void copyFrom(
+      int fromIndex, int thisIndex, ValueVector from, 
ExtensionTypeWriterFactory writerFactory) {
+    throw new UnsupportedOperationException();

Review Comment:
   No, because this method is used only with complex type vectors and they have 
implementation; for non-complex, it's not supported, and this behavior is 
covered here



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