InsertQuery   (children 3)
 Identifier join_test
 ExpressionList (children 2)
  Identifier id
  Identifier num
 SelectWithUnionQuery (children 1)
  ExpressionList (children 1)
   SelectQuery (children 3)
    ExpressionList (children 2)
     Identifier number
     Function multiply (children 1)
      ExpressionList (children 2)
       Identifier number
       Literal UInt64_2
    TablesInSelectQuery (children 1)
     TablesInSelectQueryElement (children 1)
      TableExpression (children 1)
       TableIdentifier system.numbers
    Literal UInt64_1000