SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 3)
   ExpressionList (children 1)
    Asterisk
   TablesInSelectQuery (children 1)
    TablesInSelectQueryElement (children 1)
     TableExpression (children 1)
      TableIdentifier fill
   ExpressionList (children 2)
    OrderByElement (children 1)
     Identifier a
    OrderByElement (children 3)
     Identifier b
     Literal UInt64_6
     Literal UInt64_2
