[GitHub] [arrow] cyb70289 commented on a diff in pull request #14442: ARROW-18081: [Go] Add Scalar Boolean functions

[GitBox <gi...@apache.org>]

cyb70289 commented on code in PR #14442:
URL: https://github.com/apache/arrow/pull/14442#discussion_r998872925


##########
go/arrow/bitutil/bitmaps.go:
##########
@@ -390,15 +396,26 @@ func CopyBitmap(src []byte, srcOffset, length int, dst []byte, dstOffset int) {
 		rdr := NewBitmapWordReader(src, srcOffset, length)
 		wr := NewBitmapWordWriter(dst, dstOffset, length)
 
+		var modify func(in uint64) uint64
+		switch mode {
+		case transferCopy:
+			modify = func(in uint64) uint64 { return in }
+		case transferInvert:
+			modify = func(in uint64) uint64 { return ^in }
+		}
+
 		nwords := rdr.Words()
 		for nwords > 0 {
 			nwords--
-			wr.PutNextWord(rdr.NextWord())
+			wr.PutNextWord(modify(rdr.NextWord()))

Review Comment:
   Nit: since we still have to check `mode` explicitly in later code, looks `if else` is simpler here?



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