[fdo-trac] #450: Expression Function SUBSTR does not work as expected

[FDO]

#450: Expression Function SUBSTR does not work as expected
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   Reporter:  thomasknoell  |       Owner:  gregboone
       Type:  defect        |      Status:  new      
   Priority:  major         |   Milestone:           
  Component:  FDO API       |     Version:  3.4.0    
   Severity:  3             |    Keywords:           
External_id:                |  
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 The expression function SUBSTR allows a user to enter a negative number as
 the start position of a substring. If a negative number is entered, the
 start of the substring is calculated from the end of the source string
 according to the provided index. The current default implementation of
 this function does not support this. Instead, it returns a string from the
 1st position of the source string.

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Ticket URL: <http://trac.osgeo.org/fdo/ticket/450>
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