[teiid-issues] [JBoss JIRA] (TEIID-5498) Allow the pg layer to work for simple selects with the postgres_fdw

[Steven Hawkins (Jira)]

    [ https://issues.jboss.org/browse/TEIID-5498?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13643895#comment-13643895 ] 

Steven Hawkins commented on TEIID-5498:
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The initial commit is.  I'll do more testing with a variety of types.  We may also need to add enforcement of metadata constraints - such as string length - as to ensure proper results.  That would be similar to existing logic in odata.

This is also not a general purpose solution yet as including predicates can result in sql that isn't yet valid for us, such as using pg type names in casts 'a'::text - most of those issues would be easy to address though.

> Allow the pg layer to work for simple selects with the postgres_fdw
> -------------------------------------------------------------------
>
>                 Key: TEIID-5498
>                 URL: https://issues.jboss.org/browse/TEIID-5498
>             Project: Teiid
>          Issue Type: Sub-task
>          Components: ODBC
>            Reporter: Steven Hawkins
>            Assignee: Steven Hawkins
>            Priority: Major
>             Fix For: 11.2
>
>
> Another avenue for materialization support outlined in TEIID-4251 is to rely upon pg materialization, which would be easiest to setup through their foreign data wrapper.  However it expects some additional support for:
> start transaction syntax
> abort transaction
> automatic cleanup of portals/cursors at the end of a transaction
> prepared cursors
> Additionally this will have the same performance issue that we have with declare/fetch initially - that is a cursor requires a transaction, and our current strategy requires pre-buffering the results under a transaction.  However since this would only be used for load/refresh that performance hit may be negligible - if now we'd need similar logic to effectively ignore the transaction wrapping.



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