attribute filter column name mapping problem

[assefa]

In the  SOS layer definition, the user has the possiblity to use _alias_ fro
colum names.

When doing a GetObservation (using ogc filter), we should make sure that the
column names passed be modified to reflect the real column names in the data

[assefa]

Coorected in r6119. Please close bug after testing.

[tomkralidis]

Tested. Works with either the native col name:

 http://devgeo.cciw.ca/cgi-bin/mapserv/sostest?service=SOS&version=0.1.2&request=GetObservation&offering=Water&observedproperty=WaterQuality&responseFormat=text/xml;%20subtype=om/0.14.7&result=<Filter><PropertyIsEqualTo><PropertyName>CONDUCTANC</PropertyName><Literal>26.4</Literal></PropertyIsEqualTo></Filter>

...or the specified _alias_ name:

 http://devgeo.cciw.ca/cgi-bin/mapserv/sostest?service=SOS&version=0.1.2&request=GetObservation&offering=Water&observedproperty=WaterQuality&responseFormat=text/xml;%20subtype=om/0.14.7&result=<Filter><PropertyIsEqualTo><PropertyName>conductance</PropertyName><Literal>26.4</Literal></PropertyIsEqualTo></Filter>

Assefa: when I enter a column name that does not exist, I get an empty response:

 http://devgeo.cciw.ca/cgi-bin/mapserv/sostest?service=SOS&version=0.1.2&request=GetObservation&offering=Water&observedproperty=WaterQuality&responseFormat=text/xml;%20subtype=om/0.14.7&result=<Filter><PropertyIsEqualTo><PropertyName>foo</PropertyName><Literal>26.4</Literal></PropertyIsEqualTo></Filter>

...when this should return a service exception saying something like "component name foo does not exist" (i.e. an InvalidParameterValue)

[tomkralidis]

Think I figured it out. The attached patch returns an exception if the column alias is not found.

Assefa: can you let me know if this is correct or if we are missing anything?

[assefa]

Made hanges to generate exception for invalid property names r6120.

Closing bug.