adamreeve commented on code in PR #41226:
URL: https://github.com/apache/arrow/pull/41226#discussion_r1566516865
##########
csharp/src/Apache.Arrow/Arrays/ArrayDataConcatenator.cs:
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@@ -367,7 +367,7 @@ private ArrowBuffer ConcatenateUnionTypeBuffer()
foreach (ArrayData arrayData in _arrayDataList)
{
- builder.Append(arrayData.Buffers[0]);
+
builder.Append(arrayData.Buffers[0].Span.Slice(arrayData.Offset,
arrayData.Length));
Review Comment:
I'm using the offset here but I haven't tested this works fully with sliced
arrays, I'll follow up on this in #41164.
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