[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 ] Thejas M Nair 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 Fix For: 0.8.0 Attachments: automaton.jar, poregex2.patch 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. -- This message is automatically generated by JIRA. - You can reply to this email to add a comment to the issue online.
[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 (was: Benjamin Francisoud) 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 Attachments: automaton.jar, poregex2.patch 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. -- This message is automatically generated by JIRA. - You can reply to this email to add a comment to the issue online.
