InsertQuery   (children 2)
 Identifier test_insert_t1
 SelectWithUnionQuery (children 1)
  ExpressionList (children 1)
   SelectQuery (children 4)
    ExpressionList (children 4)
     Literal \'2019-09-01\'
     Function toString (children 1)
      ExpressionList (children 1)
       Identifier number
     Function toString (children 1)
      ExpressionList (children 1)
       Function rand (children 1)
        ExpressionList
     Function toString (children 1)
      ExpressionList (children 1)
       Function rand (children 1)
        ExpressionList
    TablesInSelectQuery (children 1)
     TablesInSelectQueryElement (children 1)
      TableExpression (children 1)
       TableIdentifier system.numbers
    Function greater (children 1)
     ExpressionList (children 2)
      Identifier number
      Literal UInt64_10
    Literal UInt64_1000000