jean-claude created DRILL-4573: ---------------------------------- Summary: Zero copy LIKE, REGEXP_MATCHES, SUBSTR Key: DRILL-4573 URL: https://issues.apache.org/jira/browse/DRILL-4573 Project: Apache Drill Issue Type: Improvement Reporter: jean-claude Priority: Minor
All the functions using the java.util.regex.Matcher are currently creating Java string objects to pass into the matcher.reset(). However this creates unnecessary copy of the bytes and a Java string object. The matcher uses a CharSequence, so instead of making a copy we can create an adapter from the DrillBuffer to the CharSequence interface. Gains of 25% in execution speed are possible when going over VARCHAR of 36 chars. The gain will be proportional to the size of the VARCHAR. -- This message was sent by Atlassian JIRA (v6.3.4#6332)