InsertQuery   (children 2)
 Identifier t2
 SelectWithUnionQuery (children 1)
  ExpressionList (children 1)
   SelectQuery (children 3)
    ExpressionList (children 2)
     Function toString (children 1)
      ExpressionList (children 1)
       Identifier number
     Function toDecimal64 (children 1)
      ExpressionList (children 2)
       Identifier number
       Literal UInt64_8
    TablesInSelectQuery (children 1)
     TablesInSelectQueryElement (children 1)
      TableExpression (children 1)
       TableIdentifier system.numbers
    Literal UInt64_1000000