SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 2)
   ExpressionList (children 1)
    Asterisk
   TablesInSelectQuery (children 1)
    TablesInSelectQueryElement (children 1)
     TableExpression (children 1)
      Function mongodb (children 1)
       ExpressionList (children 6)
        Literal \'mongodb://some-cluster:27017/?retryWrites=false\'
        Literal \'test\'
        Literal \'my_collection\'
        Literal \'test_user\'
        Literal \'password\'
        Literal NULL
