I have a function which uses a named schema

 function removeNullSequence (test TestSchema, sequenceNumber int) {   TestSchema(test.id, coalesce(sequenceNumber, test.value)) }

If the application does not also have an Query Table element, then the application uses the function and runs without error.

If the application does have a Query Table, then the application fails at startup with error:
 

 ERROR c.streambase.sb.xmlrpc.XmlRpcManager - Exception processing RPC:  GenerationContext$DereferenceNonExistentFieldException: Attempted to dereference  nonexistent field TupleHandle@38510607(Constant_TestSchema).TestSchema

How can I use my function in an application that also has a Query Table?

This issue is defect "SB-46124 Attempted to dereference nonexistent field from constant function using named schema" found to affect TIBCO StreamBase 7.7.6 and TIBCO Streaming 10.4.2 and likely earlier versions as well. This may be fixed in a future release, so please check the Release Notes.

There are two workarounds...

A) Change the function to not use a the named schema in the implementation by name, but the type of a parameter of that type, using the new_tuple() function:
 

 function removeNullSequence (test TestSchema, sequenceNumber int) {   new_tuple(test,test.id as id, coalesce(sequenceNumber, test.value) as test.value) }

B) Remove the function as a Constant and use it in a Map declaration where needed in Additional Expressions:


This prevents the function from being typechecked before the named schemas are defined.

Known defect and alternatives