.z namespace override

KX uses the .z namespace that contains environment variables and functions, and hooks for callbacks. A FinSpace Managed kdb Insights cluster doesn't support direct assignment for .z namespace callbacks because of security concerns. For example, the system denies access to the following direct .z.ts assignment.

q)con".z.ts:{[x]}" / con is the hopen filehandle
'access
[0]  con".z.ts:{[x]}"

Because some of the assignments for .z namespace callbacks are critical for business logic, FinSpace provides a reserved namespace .awscust.z for you to override functions within the .z namespace.

By overriding the functions within the new .awscust.z namespace, you can achieve the same effect as if you were directly overriding allowlisted .z functions.

For example, if you need to override the .z.ts function, you can set a value for .awscust.z.ts. The FinSpace Managed kdb cluster invokes the .awscust.z.ts function whenever you invoke the .z.ts function, which provides a safety wrapper.

The following list shows the allowlisted callbacks for the .awscust.z namespace.

.awscust.z.ts 
.awscust.z.pg
.awscust.z.ps
.awscust.z.po
.awscust.z.pc
.awscust.z.ws
.awscust.z.wo
.awscust.z.wc
.awscust.z.pd
.awscust.z.ph
.awscust.z.pi:
.awscust.z.exit

If you override .z callbacks that aren't on the preceding list, you won't have any effects on the .z namespace callbacks.