GH-87: removed unneeded override

Author: xxlaykxx

vector/src/main/java/org/apache/arrow/vector/complex/impl/AbstractExtensionTypeWriter.java

@@ -58,14 +58,9 @@ public void clear() {
     this.vector.clear();
   }
 
-  @Override
-  protected int idx() {
-    return super.idx();
-  }
-
   @Override
   public void writeNull() {
-    this.vector.setNull(this.idx());
-    this.vector.setValueCount(this.idx() + 1);
+    this.vector.setNull(getPosition());
+    this.vector.setValueCount(getPosition() + 1);
   }
 }

vector/src/test/java/org/apache/arrow/vector/complex/impl/UuidWriterImpl.java

@@ -34,14 +34,14 @@ public void writeExtension(Object value) {
     ByteBuffer bb = ByteBuffer.allocate(16);
     bb.putLong(uuid.getMostSignificantBits());
     bb.putLong(uuid.getLeastSignificantBits());
-    vector.setSafe(idx(), bb.array());
-    vector.setValueCount(this.idx() + 1);
+    vector.setSafe(getPosition(), bb.array());
+    vector.setValueCount(getPosition() + 1);
   }
 
   @Override
   public void write(ExtensionHolder holder) {
     UuidHolder uuidHolder = (UuidHolder) holder;
-    vector.setSafe(this.idx(), uuidHolder.value);
-    vector.setValueCount(this.idx() + 1);
+    vector.setSafe(getPosition(), uuidHolder.value);
+    vector.setValueCount(getPosition() + 1);
   }
 }