[teiid-issues] [JBoss JIRA] (TEIID-2371) Provide a callback when there are no results for a query incase of asynchronous queries

[Steven Hawkins (JIRA)]

    [ https://issues.jboss.org/browse/TEIID-2371?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12751939#comment-12751939 ] 

Steven Hawkins commented on TEIID-2371:
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> So as beforeNextExecution gets called in between the executions this doesn't perfectly identify the empty result set.

A "has results flag" or a counter of the rows processed in onRow will identify if the results were empty when beforeNextExecution is called.  You could even use the ResultSet.getRow() call - keeping in mind that it have a dummy row for each execution that identifies the end of results.

None of these approaches would fail to detect empty results.
                
> Provide a callback when there are no results for a query incase of asynchronous queries
> ---------------------------------------------------------------------------------------
>
>                 Key: TEIID-2371
>                 URL: https://issues.jboss.org/browse/TEIID-2371
>             Project: Teiid
>          Issue Type: Feature Request
>            Reporter: Vineela Gampa
>            Assignee: Steven Hawkins
>         Attachments: EmptyResultSetAsyncTest.java, ExecuteAsyncContinously.java
>
>
> When a query doesn,t return results , please provide a callback method indicating end of results. 

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