SelectWithUnionQuery (children 2)
 ExpressionList (children 1)
  SelectQuery (children 3)
   ExpressionList (children 2)
    Function globalVariable (alias @@max_allowed_packet) (children 1)
     ExpressionList (children 1)
      Literal \'max_allowed_packet\'
    Identifier number
   TablesInSelectQuery (children 1)
    TablesInSelectQueryElement (children 1)
     TableExpression (children 1)
      TableIdentifier system.numbers
   Literal UInt64_3
 Identifier CSVWithNames