arouel commented on code in PR #3521:
URL: https://github.com/apache/parquet-java/pull/3521#discussion_r3119684200
##########
parquet-column/src/main/java/org/apache/parquet/column/values/deltastrings/DeltaByteArrayWriter.java:
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@@ -89,7 +89,10 @@ public String memUsageString(String prefix) {
@Override
public void writeBytes(Binary v) {
int i = 0;
- byte[] vb = v.getBytes();
+ // copy() is a no-op for constant (non-reused) Binaries, and
getBytesUnsafe()
+ // returns the backing array directly for ByteArrayBackedBinary — avoiding
+ // the unconditional array copy that getBytes() always performs.
+ byte[] vb = v.copy().getBytesUnsafe();
Review Comment:
I address this area already in PR #3465. Can review it and reduce that one
to the part which is not addressed there?
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