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https://issues.apache.org/jira/browse/HIVE-1747?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12931227#action_12931227
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John Sichi commented on HIVE-1747:
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Also: while at ApacheCon, I heard that the Pig team was using this as a faster
replacement for Java regexp:
http://www.brics.dk/automaton/
We might want to do the same. See PIG-965 for more details.
> Make case-insensitive substring search as fast as case-sensitive variant
> ------------------------------------------------------------------------
>
> Key: HIVE-1747
> URL: https://issues.apache.org/jira/browse/HIVE-1747
> Project: Hive
> Issue Type: Improvement
> Components: Query Processor
> Affects Versions: 0.7.0
> Reporter: John Sichi
>
> {noformat}
> WHERE str_col like '%XYZ%'
> {noformat}
> is very fast because the pattern matching code is special-cased. However,
> {noformat}
> WHERE str_col rlike '(?i).*XYZ.*'
> {noformat}
> is very slow because it goes through the generic Java pattern matching.
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