SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 3)
   ExpressionList (children 1)
    Function lambda (alias lambda) (children 1)
     ExpressionList (children 2)
      Function tuple (children 1)
       ExpressionList (children 1)
        Identifier x
      Function concat (children 1)
       ExpressionList (children 2)
        Function concat (children 1)
         ExpressionList (children 2)
          Identifier x.value_0_level_0
          Literal \'_\'
        Identifier x.value_1_level_0
   ExpressionList (children 1)
    Function lambda (children 1)
     ExpressionList (children 1)
      Identifier value
   TablesInSelectQuery (children 1)
    TablesInSelectQueryElement (children 1)
     TableExpression (children 1)
      TableIdentifier test_table_tuple