[jira] [Resolved] (IMPALA-10849) A LIKE predicate that ends in an escaped wildcard is incorrectly evaluated

["Quanlong Huang (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/IMPALA-10849?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Quanlong Huang resolved IMPALA-10849.
-------------------------------------
    Fix Version/s: Impala 4.1.0
       Resolution: Fixed

> A LIKE predicate that ends in an escaped wildcard is incorrectly evaluated
> --------------------------------------------------------------------------
>
>                 Key: IMPALA-10849
>                 URL: https://issues.apache.org/jira/browse/IMPALA-10849
>             Project: IMPALA
>          Issue Type: Bug
>          Components: Backend
>            Reporter: Andrew Sherman
>            Assignee: Andrew Sherman
>            Priority: Critical
>             Fix For: Impala 4.1.0
>
>
> If the last character of a LIKE predicate is an escaped wildcard (e.g. LIKE foo\%) then it is incorrectly evaluated. This is because the fast path optimizations in LikePrepareInternal treat the predicate as being a search for a string with a fixed prefix. If the fast path optimizations are commented out then the LIKE is evaluated correctly.
> A possible fix would be to make the fast path optimizations recognize that escaped wildcards cannot be evaluated by the fixed prefix search.
> This is a simpler bug than that discussed in IMPALA-2422 which is to do with ambiguities in the logic of unescaping string literals (which is more tricky to fix).



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