Hi All,
We are actually testing the capabilities of the UNION layers especially in a
WFS server context. We were able to perform WFS GetFeature request against a
union layer, however as soon as we add a filtering criteria to our request It
starts returns empty response. Performing the same request on the underlying
request works perfectly.
Here is the details about our map file definition and also sample WFS requests
made.
LAYER
NAME 'unioned'
TYPE POLYGON
STATUS DEFAULT
CONNECTIONTYPE UNION
CONNECTION "layer1,layer2"
PROCESSING "ITEMS=PKEY,PROJ_NAME"
EXTENT 815927.781772741 639558.864791513 1248160.81380272 917014.748839214
METADATA
"gml_featureid" "PKEY"
"ows_enable_request" "*"
"ows_extent" "815927.781772741 639558.864791513 1248160.81380272
917014.748839214"
"ows_srs" "EPSG:2234"
"ows_title" "unioned"
"gml_include_items" "all"
"gml_types" "auto"
END # METADATA
STYLEITEM "AUTO"
# Define an empty class that will be filled at runtime from the color and
# styles read from each source layer.
CLASS
END
END
LAYER
CONNECTION "layer1.shp"
CONNECTIONTYPE OGR
EXTENT 815927.781772741 639558.864791513 1248160.81380272 917014.748839214
METADATA
"gml_featureid" "PKEY"
"ows_enable_request" "*"
"ows_extent" "815927.781772741 639558.864791513 1248160.81380272
917014.748839214"
"ows_srs" "EPSG:2234"
"ows_title" "layer1"
"gml_include_items" "all"
"gml_types" "auto"
END # METADATA
NAME "layer1"
PROJECTION
"init=epsg:2234"
END # PROJECTION
STATUS ON
TILEITEM "location"
TYPE POLYGON
UNITS METERS
CLASS
NAME "01 STIP"
EXPRESSION ('[PROJ_CURRE]' eq '01_STIP')
STYLE
COLOR "#ffc80066"
OPACITY 40
OUTLINECOLOR "#ffc80066"
WIDTH 3
END # STYLE
END # CLASS
END # LAYER
LAYER
CONNECTION "layer2.shp"
CONNECTIONTYPE OGR
EXTENT 815927.781772741 639558.864791513 1248160.81380272 917014.748839214
METADATA
"gml_featureid" "PKEY"
"ows_enable_request" "*"
"ows_extent" "815927.781772741 639558.864791513 1248160.81380272
917014.748839214"
"ows_srs" "EPSG:2234"
"ows_title" "layer2"
"gml_include_items" "all"
"gml_types" "auto"
END # METADATA
NAME "layer2"
PROJECTION
"init=epsg:2234"
END # PROJECTION
STATUS ON
TILEITEM "location"
TYPE POLYGON
UNITS METERS
CLASS
NAME "01 STIP"
EXPRESSION ('[PROJ_CURRE]' eq '01_STIP')
STYLE
COLOR "#ffc80066"
OPACITY 40
OUTLINECOLOR "#ffc80066"
WIDTH 3
END # STYLE
END # CLASS
END # LAYER
Request against Layer1, return correct data.
http://localhost/ms/Mapserv.exe?SERVICE=WFS&REQUEST=GetFeature&VERSION=1.1.0&FILTER=<ogc:Filter
xmlns:ogc="http://www.opengis.net/ogc";><ogc:PropertyIsEqualTo><ogc:PropertyName>PROJ_NAME</ogc:PropertyName><ogc:Literal>0172-0417</ogc:Literal></ogc:PropertyIsEqualTo></ogc:Filter>&RESULTTYPE=results&TYPENAME=layer1&PROPERTYNAME=(PROJ_NAME)&MAP=Internal/mastermap.map
Layer2 works, return correct data.:
http://localhost/ms/Mapserv.exe?SERVICE=WFS&REQUEST=GetFeature&VERSION=1.1.0&FILTER=<ogc:Filter
xmlns:ogc="http://www.opengis.net/ogc";><ogc:PropertyIsEqualTo><ogc:PropertyName>PROJ_NAME</ogc:PropertyName><ogc:Literal>0172-0417</ogc:Literal></ogc:PropertyIsEqualTo></ogc:Filter>&RESULTTYPE=results&TYPENAME=layer2&PROPERTYNAME=(PROJ_NAME)&MAP=Internal/mastermap.map
Unioned with filter returns empty answer:
http://localhost/ms/Mapserv.exe?SERVICE=WFS&REQUEST=GetFeature&VERSION=1.1.0&FILTER=<ogc:Filter
xmlns:ogc="http://www.opengis.net/ogc";><ogc:PropertyIsEqualTo><ogc:PropertyName>PROJ_NAME</ogc:PropertyName><ogc:Literal>0172-0417</ogc:Literal></ogc:PropertyIsEqualTo></ogc:Filter>&RESULTTYPE=results&TYPENAME=unioned&PROPERTYNAME=(PROJ_NAME)&MAP=Internal/mastermap.map
Unioned without filter returns correct data.:
http://localhost/MapRenderingEngine/Mapserv.exe?SERVICE=WFS&REQUEST=GetFeature&VERSION=1.1.0&RESULTTYPE=results&TYPENAME=unioned&PROPERTYNAME=(PROJ_NAME)&MAP=Internal/mastermap.map
So is this a known limitation or maybe a bug? Does anyone have any suggestion
to work around this?
Thanks!
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