InsertQuery   (children 3)
 Identifier t_mt_source
 SelectWithUnionQuery (children 1)
  ExpressionList (children 1)
   SelectQuery (children 4)
    ExpressionList (children 2)
     Identifier number (alias k)
     Function toString (alias v) (children 1)
      ExpressionList (children 1)
       Identifier number
    TablesInSelectQuery (children 1)
     TablesInSelectQueryElement (children 1)
      TableExpression (children 1)
       TableIdentifier system.numbers_mt
    Literal Float64_1000000
    Set
 Set
