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Posted to dev@pig.apache.org by "Ankit Modi (JIRA)" <ji...@apache.org> on 2009/11/17 20:54:39 UTC
[jira] Assigned: (PIG-965) PERFORMANCE: optimize common case in
matches (PORegex)
[ https://issues.apache.org/jira/browse/PIG-965?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Ankit Modi reassigned PIG-965:
------------------------------
Assignee: Ankit Modi
> PERFORMANCE: optimize common case in matches (PORegex)
> ------------------------------------------------------
>
> Key: PIG-965
> URL: https://issues.apache.org/jira/browse/PIG-965
> Project: Pig
> Issue Type: Improvement
> Components: impl
> Reporter: Thejas M Nair
> Assignee: Ankit Modi
>
> Some frequently seen use cases of 'matches' comparison operator have follow properties -
> 1. The rhs is a constant string . eg "c1 matches 'abc%' "
> 2. Regexes such that look for matching prefix , suffix etc are very common. eg - "abc%', "%abc", '%abc%'
> To optimize for these common cases , PORegex.java can be changed to -
> 1. Compile the pattern (rhs of matches) re-use it if the pattern string has not changed.
> 2. Use string comparisons for simple common regexes (in 2 above).
> The implementation of Hive like clause uses similar optimizations.
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