SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 4)
   ExpressionList (children 1)
    Function multiply (alias square_number) (children 1)
     ExpressionList (children 2)
      Identifier number
      Literal UInt64_2
   ExpressionList (children 2)
    Identifier number
    Identifier square_number
   TablesInSelectQuery (children 1)
    TablesInSelectQueryElement (children 1)
     TableExpression (children 1)
      TableIdentifier numbers_indexed
   Function equals (children 1)
    ExpressionList (children 2)
     Identifier number
     Literal UInt64_999
