jean-claude created DRILL-4573:
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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.
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