SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 2)
   ExpressionList (children 1)
    Function concat (children 1)
     ExpressionList (children 3)
      Literal \'With \'
      Identifier attrs.k
      Identifier attrs.v
   TablesInSelectQuery (children 1)
    TablesInSelectQueryElement (children 1)
     TableExpression (children 1)
      TableIdentifier concat_nested_test
