zeroshade commented on code in PR #14442:
URL: https://github.com/apache/arrow/pull/14442#discussion_r999592878
##########
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:
simpler? yes. But i was trying to avoid an if branch in a tight loop.... I
should benchmark this and see if there's any actual difference.
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