SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 3)
   ExpressionList (children 3)
    Identifier d3
    Identifier f1
    Function least (children 1)
     ExpressionList (children 2)
      Identifier d3
      Identifier f1
   TablesInSelectQuery (children 1)
    TablesInSelectQueryElement (children 1)
     TableExpression (children 1)
      TableIdentifier t
   ExpressionList (children 1)
    OrderByElement (children 1)
     Identifier f1
