srowen commented on a change in pull request #24709: [SPARK-27841][SQL] Improve
UTF8String to/fromString()/numBytesForFirstByte() performance
URL: https://github.com/apache/spark/pull/24709#discussion_r287609636
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File path:
common/unsafe/src/main/java/org/apache/spark/unsafe/types/UTF8String.java
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@@ -1217,6 +1264,20 @@ public boolean toByte(IntWrapper intWrapper) {
@Override
public String toString() {
+ byte[] bytes = getBytes();
+ // Optimization for ASCII characters: use deprecated string API which
+ // skips charset encoder and simply casts each byte into a char.
+ if (isAscii(bytes)) {
+ return new String(bytes, 0);
Review comment:
I get that we might want to go off-road here and call a deprecated method,
but does it help meaningfully? the benchmark doesn't have the resolution to
determine it. Is it as fast to, maybe, pass US_ASCII as the charset in this
case?
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