SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 3)
   ExpressionList (children 2)
    Literal \'b\'
    Function negate (children 1)
     ExpressionList (children 1)
      Identifier x
   TablesInSelectQuery (children 1)
    TablesInSelectQueryElement (children 1)
     TableExpression (children 1)
      TableIdentifier primary_key
   Function less (children 1)
    ExpressionList (children 2)
     Function negate (children 1)
      ExpressionList (children 1)
       Identifier x
     Literal Int64_-2
