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https://issues.apache.org/jira/browse/DRILL-1537?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Alexander Zarei updated DRILL-1537:
-----------------------------------
Attachment: Drill-1537-patch-1.diff
> C++ Client: Passing the listener context to queryResultListener function
> ------------------------------------------------------------------------
>
> Key: DRILL-1537
> URL: https://issues.apache.org/jira/browse/DRILL-1537
> Project: Apache Drill
> Issue Type: Bug
> Components: Client - ODBC
> Reporter: Alexander Zarei
> Attachments: Drill-1537-patch-1.diff
>
>
> When submitting queries by the function *SubmitQuery(QueryType t, string&
> plan, pfnQueryResultsListener l, void\* lCtx)* of drillClientImp class, the
> listenerContext parameter provides a convenient way of associating returned
> results with submitted queries.
> The way it works is that the calling application passes the context to
> *SubmitQuery* and when returning results, *processQueryResult* passes the
> context to the *queryResultListener* callback function. As such, the callback
> function can associate the returned result with the context.
> When we were updating QuerySubmitter example to showcase usage of
> *SubmitQuery* with context, we noticed *processQueryResult* function does not
> pass the context directly to the *queryResultListener* callback function;
> Instead, an instance of DrillClientQueryResult which contains the context as
> a data member is passed to the *queryResultListener*. This requires the
> *queryResultListener* function, which is implemented in consumers of the C++
> Client, to know about the *DrillClientQueryResult*.
> However, *DrillClientQueryResult* is not in the public API of the C++ Client.
> Two solutions are imaginable at the first glance: First, passing the context
> instead of a *DrillClientQueryResult*, which we implemented and tested it;
> Second, moving *DrillClientQueryResult* to the public API; Moving
> *DrillClientQueryResult* to the public API does not seem to be desirable as
> it is internal detail for the C++ Client.
> I was wondering what your thoughts are on this.
> Thanks,
> Alex
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