[teiid-issues] [JBoss JIRA] (TEIID-3301) Add GEOMETRY_COLUMNS view

[Steven Hawkins (JIRA)]

    [ https://issues.jboss.org/browse/TEIID-3301?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13038303#comment-13038303 ] 

Steven Hawkins commented on TEIID-3301:
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> JTS IO classes support 3d but last time I played with them they would drop the Z coordinate when writing WKT.

Yes I've added a doc note and a check in GeomtryUtils.getGeometry to say that this implementation is effectively 2d.

> Could we do blob concatenation in all cases to return SRID 32bit int + WKB? I've only tried it on MySQL so far but it seems like it should work on the others as well.

As far as I know that could work for mysql/postgresql, but I'm not sure about oracle.  However if there is much overhead for mysql, I would just rely on the internal storage format rather than a similar function based conversion.  Also if the geometry value is being computed by a function/expression, the resulting sql could take a performance hit as the expression will be repeated.  Which is why it seems simpler to stick with the ewkb result from postgresql.

> Add GEOMETRY_COLUMNS view
> -------------------------
>
>                 Key: TEIID-3301
>                 URL: https://issues.jboss.org/browse/TEIID-3301
>             Project: Teiid
>          Issue Type: Feature Request
>            Reporter: Tom Arnold
>            Assignee: Steven Hawkins
>              Labels: spatial
>             Fix For: 8.10
>
>
> Another OGC Simple Features implementation detail. Basically this is like a specialized version of SYS.COLUMNS, and would be used to support GIS software (like GeoServer).
> http://www.carocoops.org/resources/doc/postgis/x321.html
> {code}
>   CREATE TABLE GEOMETRY_COLUMNS ( 
>     F_TABLE_CATALOG VARCHAR(256) NOT NULL, 
>     F_TABLE_SCHEMA VARCHAR(256) NOT NULL, 
>     F_TABLE_NAME VARCHAR(256) NOT NULL, 
>     F_GEOMETRY_COLUMN VARCHAR(256) NOT NULL,
>     COORD_DIMENSION INTEGER NOT NULL, 
>     SRID INTEGER NOT NULL, 
>     TYPE VARCHAR(30) NOT NULL 
>   )
> {code}
> I think we could implement this by storing SRID & friends as column properties, and then creating a view on SYS.COLUMNS & SYS.PROPERTIES.



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