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https://issues.apache.org/jira/browse/OPENJPA-1493?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Catalina Wei resolved OPENJPA-1493.
-----------------------------------
Resolution: Fixed
Fix Version/s: 2.0.0
> Performance improvement in SelectImpl.getTableIndex() for JPQL without
> subselect
> --------------------------------------------------------------------------------
>
> Key: OPENJPA-1493
> URL: https://issues.apache.org/jira/browse/OPENJPA-1493
> Project: OpenJPA
> Issue Type: Improvement
> Components: query
> Affects Versions: 2.0.0, 2.0.1, 2.1.0
> Reporter: Catalina Wei
> Assignee: Catalina Wei
> Fix For: 2.0.0
>
> Attachments: OPENJPA-1493.patch
>
>
> OPENJPA-1185 introduced query context for table alias resolution that
> improved JPQL subquery processing.
> However, JPQL queries without subselect pay performance penalty because of
> the alias resolution by query context. In fact, if JPQL or QueryExpression do
> not contain subselect, then the table alias resolution can be simplified.
> This can be done by checking if a SelectImpl is involved in a subquery:
> If SelectImpl is not a subquery (it has no parent) or SelectImpl does not
> have any subselects, then the alias resolution by query context can be
> by-passed.
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