InsertQuery   (children 3)
 Identifier foo
 ExpressionList (children 2)
  Identifier ts
  Identifier x
 SelectWithUnionQuery (children 1)
  ExpressionList (children 1)
   SelectQuery (children 3)
    ExpressionList (children 2)
     Function toDateTime (children 1)
      ExpressionList (children 1)
       Literal \'2020-01-01 00:05:00\'
     Identifier number
    TablesInSelectQuery (children 1)
     TablesInSelectQueryElement (children 1)
      TableExpression (children 1)
       TableIdentifier system.numbers_mt
    Literal UInt64_10
