[fdo-trac] #573: ArcSDE provider: implement RFC 22 (enhanced CONCAT)

[FDO]

#573: ArcSDE provider: implement RFC 22 (enhanced CONCAT)
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   Reporter:  danstoica        |       Owner:  dan stoica
       Type:  enhancement      |      Status:  new       
   Priority:  major            |   Milestone:  3.5.0     
  Component:  ArcSDE Provider  |     Version:  3.4.0     
   Severity:  2                |    Keywords:            
External_id:                   |  
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 ArcSDE provider needs changes so it supports CONCAT with unlimited
 parameters.
 Currently:
 - both Oracle and SqlServer do not support more than 2 parameters for
 Concat()
 - Oracle supports only string parameters
 - Oracle doesn't support nested ids, hence cannot use Concat(ToString(id),
 string)

 The solution is to delegate the Concat() functionality to the expression
 engine as done in other cases when certain functions are not supported
 natively.

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Ticket URL: <http://trac.osgeo.org/fdo/ticket/573>
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