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https://issues.apache.org/jira/browse/OPENJPA-168?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12480920
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Abe White commented on OPENJPA-168:
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I don't recall any way to know whether a given Select it is a top-level Select
or a parallel Select. Note that if you take my advice and implement this as an
ExpectedResultCount property of SelectExecutor (which can also replace the
isSingleResult propertyof Union), then you don't need to know. The
query/storemanager/whatever that constructs the top-level select will set the
expected count based on hints / knowledge, and the dictionary will use it as
needed. It won't get passed to parallel eager selects accidentally.
> sql optimize n rows query hint
> ------------------------------
>
> Key: OPENJPA-168
> URL: https://issues.apache.org/jira/browse/OPENJPA-168
> Project: OpenJPA
> Issue Type: New Feature
> Reporter: David Wisneski
> Assigned To: David Wisneski
>
> There werre various comments from Patrick, Abe and Kevin Sutter about the
> code that I checked related to Optimize hint. So I have gone back and
> relooked at this and wil be making some changes. At Kevin's suggestion I
> will do this through a JIRA feature so that folks will have opportunity to
> comment on this before the code is actually done and checked in.
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