[mapguide-trac] #1162: MgGwsFeatureReader does not work with left-out joins

[MapGuide Open Source]

#1162: MgGwsFeatureReader does not work with left-out joins
-----------------------+----------------------------------------------------
   Reporter:  Aleck    |       Owner:  Aleck
       Type:  defect   |      Status:  new  
   Priority:  low      |   Milestone:       
  Component:  General  |     Version:  2.0.2
   Severity:  trivial  |    Keywords:       
External_id:           |  
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 When GWS query engine is involved in querying features, an
 MgServerGwsFeatureReader will be created for reading features.

 In MgServerGwsFeatureReader::ReadNext() method, it'll get a right-side
 feature
 iterator for a left side feature using the following code:

 retVal = secondaryIter->ReadNext();
 If (retval)
 {
         // return the right-side feature
         ...
 }
 else
 {
         m_bAdvancePrimaryIterator = true;
 }

 Therefore, if there is no corresponding right-side feature, it'll skip the
 left
 side feature, which is wrong for left outer joins.

 The solution is to check if it is a left outer join. If so, the left-side
 feature still need to be returned with the right side feature property
 value set
 to NULL

-- 
Ticket URL: <http://trac.osgeo.org/mapguide/ticket/1162>
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