[fdo-trac] #759: Add support for sub-selects in select list based on RFC 50

[FDO]

#759: Add support for sub-selects in select list based on RFC 50
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   Reporter:  romicadascalescu  |       Owner:  romicadascalescu
       Type:  enhancement       |      Status:  new             
   Priority:  major             |   Milestone:  3.7.0           
  Component:  FDO API           |     Version:  3.7.0           
   Severity:  3                 |    Keywords:                  
External_id:                    |  
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 Add support for sub-selects in select list based on RFC 50
  - enhance the FdoComputedIdentifier class to be able to use a
 FdoSubSelectExpression as an expression
  - enhance the FDO parser to be able to parse such expression

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Ticket URL: <http://trac.osgeo.org/fdo/ticket/759>
FDO <http://fdo.osgeo.org/>
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