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From "Mamta A. Satoor (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (DERBY-2483) Reduce compilation time for queries with large IN lists made up of literals.
Date Tue, 02 Oct 2012 05:23:08 GMT

     [ https://issues.apache.org/jira/browse/DERBY-2483?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Mamta A. Satoor updated DERBY-2483:
-----------------------------------

    Urgency: Normal
     Labels: derby_triage10_10  (was: )
    
> Reduce compilation time for queries with large IN lists made up of literals.
> ----------------------------------------------------------------------------
>
>                 Key: DERBY-2483
>                 URL: https://issues.apache.org/jira/browse/DERBY-2483
>             Project: Derby
>          Issue Type: Improvement
>          Components: SQL
>    Affects Versions: 10.3.1.4
>            Reporter: A B
>            Priority: Minor
>              Labels: derby_triage10_10
>
> Pulled from the write-up for DERBY-47:
> As seen in the beforeAndAfter.html document attached to DERBY-47, the compilation/optimization
time for a query with an IN list consisting of all literals is far larger than it is for a
similar query in which the IN list consists of all parameters.  Since the "probe predicate"
optimization implemented as part of DERBY-47 should apply similarly to both types of queries,
it would be good to figure out what it is about literals that makes for such a long compilation
time (with respect to parameters), and to address that issue.
> Note that this relatively excessive compilation time was an issue even before the changes
for DERBY-47 were committed. 

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