eerhardt commented on code in PR #13810:
URL: https://github.com/apache/arrow/pull/13810#discussion_r1167539929
##########
csharp/src/Apache.Arrow/ArrowBuffer.BitmapBuilder.cs:
##########
@@ -69,7 +70,7 @@ public BitmapBuilder(int capacity = DefaultBitCapacity)
Memory = new byte[BitUtility.ByteCount(capacity)];
Capacity = capacity;
}
-
+
Review Comment:
(nit) Please revert the unintentional whitespace change here.
##########
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:
@westonpace has the right idea above. Add a method to the ValidityBuffer
that adds the same `bool` value `length` times without allocating an
`Enumerable.Repeat` object.
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