[teiid-issues] [JBoss JIRA] (TEIID-2257) Improved support for empty result sets in continuous executions

[Steven Hawkins (JIRA)]

     [ https://issues.jboss.org/browse/TEIID-2257?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Steven Hawkins resolved TEIID-2257.
-----------------------------------

    Fix Version/s: 8.2
       Resolution: Done


Added a ContinuousStatementCallback extension of StatementCallback with the method beforeNextExecution that alerts the client the next execution is about to start.  This is not called until after the first execution.  Also updated the reference.

The code relies on the assumption that continuous results must be forward-only and gets slightly intrusive into the processing internals since we needed additional logic in RequestWorkItem, BatchCollector, and TupleBatch.  If we ever want to support remote continuous clients that perform buffering, then additional work will be needed to preserve the partial termination flags in the tuplebuffer.
                
> Improved support for empty result sets in continuous executions
> ---------------------------------------------------------------
>
>                 Key: TEIID-2257
>                 URL: https://issues.jboss.org/browse/TEIID-2257
>             Project: Teiid
>          Issue Type: Feature Request
>          Components: Query Engine
>            Reporter: Mark Addleman
>            Assignee: Steven Hawkins
>             Fix For: 8.2
>
>
> When a continuous execution produces an empty result set, the execution will live forever because the callback is never invoked.  
> For more details see: https://community.jboss.org/message/763981#763981

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