InsertQuery   (children 2)
 Identifier test
 SelectWithUnionQuery (children 1)
  ExpressionList (children 1)
   SelectQuery (children 2)
    ExpressionList (children 1)
     Identifier x.number
    TablesInSelectQuery (children 2)
     TablesInSelectQueryElement (children 1)
      TableExpression (children 1)
       Subquery (alias x) (children 1)
        SelectWithUnionQuery (children 1)
         ExpressionList (children 1)
          SelectQuery (children 3)
           ExpressionList (children 1)
            Identifier number
           TablesInSelectQuery (children 1)
            TablesInSelectQueryElement (children 1)
             TableExpression (children 1)
              TableIdentifier system.numbers
           Literal UInt64_10
     TablesInSelectQueryElement (children 2)
      TableExpression (children 1)
       Function input (alias y) (children 1)
        ExpressionList (children 1)
         Literal \'a UInt64\'
      TableJoin (children 1)
       Function equals (children 1)
        ExpressionList (children 2)
         Identifier x.number
         Identifier y.a
