[fdo-trac] #20: Generic RDBMS: fix various SelectAggregates defects

[FDO]

#20: Generic RDBMS: fix various SelectAggregates defects
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   Reporter:  romicadascalescu  |       Owner:  romicadascalescu 
       Type:  defect            |      Status:  new              
   Priority:  major             |   Milestone:  3.3.0            
  Component:  GenericRdbms API  |     Version:  3.2.0            
   Severity:  3                 |    Keywords:  select aggregates
External_id:                    |  
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 In select aggregates execute is check if functions are supported with
 provided parameters (by looking in the extended capabilities).
 If the function is not supported an exception is thrown.
 Fixed Concat issue on ODBC SQL Server.

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Ticket URL: <http://trac.osgeo.org/fdo/ticket/20>
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