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

[Ken Geis (Jira)]

Ken Geis created TEIID-5896:
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             Summary: 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: Barry LaFond


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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