SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 2)
   ExpressionList (children 3)
    Function toLowCardinality (alias s) (children 1)
     ExpressionList (children 1)
      Literal \'a\'
    Function toTypeName (children 1)
     ExpressionList (children 1)
      Identifier s
    Function toTypeName (children 1)
     ExpressionList (children 1)
      Function length (children 1)
       ExpressionList (children 1)
        Identifier s
   TablesInSelectQuery (children 1)
    TablesInSelectQueryElement (children 1)
     TableExpression (children 1)
      TableIdentifier system.one
