asmirnov82 commented on code in PR #13810:
URL: https://github.com/apache/arrow/pull/13810#discussion_r1177877650


##########
csharp/src/Apache.Arrow/Arrays/PrimitiveArrayBuilder.cs:
##########
@@ -141,15 +141,17 @@ public TBuilder Append(ReadOnlySpan<T> span)
         {
             int len = ValueBuffer.Length;
             ValueBuffer.Append(span);
-            ValidityBuffer.AppendRange(Enumerable.Repeat(true, 
ValueBuffer.Length - len));
+            int additionalBitsCount = ValueBuffer.Length - len;
+            
ValidityBuffer.Reserve(additionalBitsCount).AppendRange(Enumerable.Repeat(true, 
additionalBitsCount));

Review Comment:
   Hello @eerhardt  and @westonpace, I added a required method and created new 
PR. Could you please take a look https://github.com/apache/arrow/pull/35342 ?



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