Performance improvement in SelectImpl.getTableIndex() for JPQL without subselect
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Key: OPENJPA-1493
URL: https://issues.apache.org/jira/browse/OPENJPA-1493
Project: OpenJPA
Issue Type: Improvement
Components: query
Reporter: Catalina Wei
Assignee: Catalina Wei
OPENJPA-1185 introduced query context that fixes JPQL subquery problems.
JPQL queries without subselect pay some performance penalty because of the
alias resolution by query context
This can be avoided with a simple test which checks to see if the SelectImpl is
involved in a subquery.
If SelectImpl is not a subquery (it has a parent) or SelectImpl does not have
any subselects, then the alias resolution
by query context can be by-passed.
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