[teiid-issues] [JBoss JIRA] (TEIID-5896) enable EXTRACT EPOCH/QUARTER from timestamp

[Steven Hawkins (Jira)]

     [ https://issues.redhat.com/browse/TEIID-5896?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Work on TEIID-5896 started by Steven Hawkins.
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> enable EXTRACT EPOCH/QUARTER from timestamp
> -------------------------------------------
>
>                 Key: TEIID-5896
>                 URL: https://issues.redhat.com/browse/TEIID-5896
>             Project: Teiid
>          Issue Type: Enhancement
>          Components: Grammar
>    Affects Versions: 12.3.1
>            Reporter: Ken Geis
>            Assignee: Steven Hawkins
>            Priority: Major
>             Fix For: 13.1
>
>
> I am connecting to Teiid from Tableau using the JDBC driver and PostgreSQL dialect. I try to drill into a timestamp field, and I get some complaints parsing the SQL. In particular, it has trouble with:
> {code:java}
> EXTRACT(QUARTER FROM the_time)
> EXTRACT(EPOCH FROM the_time)
> {code}
> The docs suggest these datetime components are not supported by Teiid. They are not standard, but supporting them would get me a step closer to running Tableau against Teiid (a killer app!)
> I was able to work around the QUARTER by dismissing the error, drilling down to month, dismissing the error again, then dragging the quarter out of my drill-down.
> I worked around the EPOCH by moving a date difference from being calculated in Tableau to calculating it in Teiid with TIMESTAMPDIFF.
> An alternate I tried was using Tableau's SQL92 dialect, but it issues a "SELECT TOP" clause that is not SQL92 standard and also not supported by Teiid.



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