Armin Braun created SPARK-21967:
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Summary: org.apache.spark.unsafe.types.UTF8String#compareTo Should
Compare 8 Bytes at a Time for Better Performance
Key: SPARK-21967
URL: https://issues.apache.org/jira/browse/SPARK-21967
Project: Spark
Issue Type: Improvement
Components: Spark Core
Affects Versions: 2.2.0
Reporter: Armin Braun
Priority: Minor
org.apache.spark.unsafe.types.UTF8String#compareTo contains the following TODO:
{code}
int len = Math.min(numBytes, other.numBytes);
// TODO: compare 8 bytes as unsigned long
for (int i = 0; i < len; i ++) {
// In UTF-8, the byte should be unsigned, so we should compare them as
unsigned int.
{code}
The todo should be resolved by comparing the maximum number of 64bit words
possible in this method, before falling back to unsigned int comparison.
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