SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 2)
   ExpressionList (children 1)
    Function sum (children 1)
     ExpressionList (children 1)
      Function mapContains (children 1)
       ExpressionList (children 2)
        Identifier m
        Function toNullable (children 1)
         ExpressionList (children 1)
          Literal \'aaa\'
   TablesInSelectQuery (children 1)
    TablesInSelectQueryElement (children 1)
     TableExpression (children 1)
      TableIdentifier t_func_to_subcolumns_map_2
