SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 5)
   ExpressionList (children 1)
    Identifier a (alias key)
   ExpressionList (children 2)
    Identifier a (alias k1)
    Function sum (alias k2) (children 1)
     ExpressionList (children 1)
      Identifier b
   TablesInSelectQuery (children 1)
    TablesInSelectQueryElement (children 1)
     TableExpression (children 1)
      TableIdentifier test
   ExpressionList (children 1)
    Identifier key
   ExpressionList (children 2)
    OrderByElement (children 1)
     Identifier k1
    OrderByElement (children 1)
     Identifier k2
