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Posted to issues@phoenix.apache.org by GitBox <gi...@apache.org> on 2022/04/04 22:12:02 UTC
[GitHub] [phoenix] Rodolffo opened a new pull request, #1412: PHOENIX-1291 Add ILIKE optimization for initial literal part
Rodolffo opened a new pull request, #1412:
URL: https://github.com/apache/phoenix/pull/1412
For optimizing the ILIKE queries, during the optimization phase, a set of ranges (2^n to be precise) are created for limiting results, if the pattern starts with a string literal, as such:
'abc%' will generate 'abc', 'Abc', 'aBc', 'abC', 'ABc', 'AbC', 'aBC', and 'ABC'.
I'm not completely sure if this solution is valid, and I'd like to do a few performance tests on how it performs which I'll share here, but in the meanwhile I'd appreaciate any feedback and suggestions. I mostly followed James Taylor's comments and the discussion in https://issues.apache.org/jira/browse/PHOENIX-1273, which the original ticket refers to.
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[GitHub] [phoenix] Rodolffo commented on pull request #1412: PHOENIX-1291 Add ILIKE optimization for initial literal part
Posted by GitBox <gi...@apache.org>.
Rodolffo commented on PR #1412:
URL: https://github.com/apache/phoenix/pull/1412#issuecomment-1088500641
Also the number of ranges generated grows exponentially as the prefix size is larger, so it may make sense to introduce a reasonable limit on prefix size generated.
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[GitHub] [phoenix] rudolfzundel-seon commented on pull request #1412: PHOENIX-1291 Add ILIKE optimization for initial literal part
Posted by GitBox <gi...@apache.org>.
rudolfzundel-seon commented on PR #1412:
URL: https://github.com/apache/phoenix/pull/1412#issuecomment-1088494853
Also the number of ranges generated grows exponentially as the prefix size is larger, so it may make sense to introduce a reasonable limit on prefix size generated.
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