Todd Lipcon created IMPALA-8316:
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Summary: Update re2 to avoid lock contention
Key: IMPALA-8316
URL: https://issues.apache.org/jira/browse/IMPALA-8316
Project: IMPALA
Issue Type: Improvement
Components: Backend
Reporter: Todd Lipcon
I ran the following test query and found that it spent a lot of time in lock
contention within the re2 library:
```select sum(l_linenumber) from item_20x where regexp_extract(l_shipinstruct,
'.*E', 0) like '%E' ;```
I think this lock contention would happen on any regex that involves
backtracking. This was fixed in the re2 library upstream in
https://github.com/google/re2/commit/eb00dfdd82015be22086cacc6bf830f72a10e2bc#diff-a60a8d25ed15adf68b94c85775fd3cf7
We should consider upgrading re2 to the latest release, or if not that, at
least cherry-picking this perf fix.
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