def getUnionRecords(tables,fieldNames)
      unionRecords = []
      iterateUnionRecords(tables,fieldNames) { |unionRecord| 
         unionRecords << unionRecord.dup 
      }
      unionRecords
   end
def getUnionRecords(tables,fieldNames)
      unionRecords = []
      iterateUnionRecords(tables,fieldNames) { |unionRecord| 
         unionRecords << unionRecord.dup 
      }
      unionRecords
   end
Returns an Array of values from the same fields in two or more tables and/or queries.
 The merged records will be unique. This is similar to an SQL UNION.