c# - WithSqlFilter WITH (NOEXPAND) hint not correct in output SQL -

i'm trying use new .withsqlfilter() extension method add "with (noexpand)" hint select statement generated against indexed view. however, output sql putting hint after clause instead of clause. customer dto has [alias("customerinfo")]. intended behavior or generating sql incorrectly?

var customer = db.from<customer>()                  .where(ci => ci.customerid == customercode)                  .withsqlfilter(sql => issqlserver(db) ? sql + " (noexpand)" : sql);  return db.single(customer); 

edit: needed issqlserver method because have unit tests , other code uses sqlite instead of sql server , needed able ignore hint based on connection.

private bool issqlserver(idbconnection db) {     var dialect = db.getdialectprovider();      return dialect servicestack.ormlite.sqlserver.sqlserverormlitedialectprovider ||            dialect servicestack.ormlite.sqlserver.sqlserver2012ormlitedialectprovider ||            dialect servicestack.ormlite.sqlserver.sqlserver2014ormlitedialectprovider ||            dialect servicestack.ormlite.sqlserver.sqlserver2016ormlitedialectprovider; } 

generated sql:

select top 1 "customerid", "firstname", "middleinitial", "lastname", "address", "city", "state", "zipcode", "dateofbirth", "homephonenumber", "cellphonenumber", "emailaddress", "enrollmentdate", "isemployee", "modifydate", "lastmodifiedbyemployee"  "customerinfo" ("customerid" = @0) (noexpand) params: @0=123456  

the withsqlfilter gets called complete sql statement if you're concatenating " (noexpand)" @ end of sql string that's appends to.

to extend clause can either replace like:

.withsqlfilter(sql => issqlserver(db)      ? sql.replace("from \"customerinfo\"", "from \"customerinfo\" (noexpand)")      : sql); 

or can extend fromexpression, e.g:

var q = db.from<customer>()     .where(ci => ci.customerid == customercode);  q.fromexpression += " (noexpand)";