[teiid-issues] [JBoss JIRA] Resolved: (TEIID-993) Enhance XML processing to execute relational queries in parallel when possible

[Steven Hawkins (JIRA)]

     [ https://issues.jboss.org/browse/TEIID-993?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Steven Hawkins resolved TEIID-993.
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    Fix Version/s: 7.4.1
       Resolution: Done


Added logic to look ahead for execsqlinstructions within a program and to init/open the processors - this is the situation when there are sibling mappingclasses at the same document level.  For typical query plans, opening them will submit the relevant source queries.  The output is still built sequentially.

> Enhance XML processing to execute relational queries in parallel when possible
> ------------------------------------------------------------------------------
>
>                 Key: TEIID-993
>                 URL: https://issues.jboss.org/browse/TEIID-993
>             Project: Teiid
>          Issue Type: Feature Request
>          Components: Query Engine
>            Reporter: Steven Hawkins
>            Assignee: Steven Hawkins
>             Fix For: 7.4.1
>
>
> Per feedback from Barry, was reviewing XML processing and because we execute all queries serially in our XML processing.  However, conceptually, we could often execute multiple mapping class and/or temp table queries in parallel.  When time permits it might be benefitial to investigate this.
> All mapping classes at depth "n" in the document model are independent of each other, so they can be executed in parallel.  Each mapping class may have input sets to any ancestor mapping class up to depth "n-1", or may select from any temp table up to depth "n" (the same depth).

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