PostGIS cannot be used as a TILEINDEX source

[hrz@…]

I believe PostGIS should be able to be used as a datasource for tileindices
using the following mapfile syntax:

    # layer specifying the tileindex
    LAYER
        NAME "my_layer_idx"
        TYPE TILEINDEX
        CONNECTIONTYPE postgis
        CONNECTION "dbname=db user=me password=go host=localhost"
        DATA "the_geom from tiletest"
    END

    # layer using the tileindex
    LAYER
        NAME "my_layer"
        STATUS ON
        TYPE RASTER
        TILEINDEX "my_layer_idx"
    END

As described at
<http://mapserver.gis.umn.edu/wilma/mapserver-dev/0409/msg00005.html>, however,
this does not work due to the fact that the code in mappostgis.c isn't checking
the layer's TYPE attribute for the TILEINDEX value in the
msPOSTGISLayerGetShapeRandom() function.

The attached patch fixes this, as well as making msPOSTGISLayerGetShape() aware
of tileindices.

[hrz@…]

Patch for mappostgis.c in CVS

[pramsey]

I believe recent versions of Mapserver now support this.