Use built-in functions

Similar to built-in connectors, the code of Java functions packaged as NAR that are placed in the functions directory of the function worker are loaded at startup and can be referenced when creating a function.

For instance if you have a built-in function with name exclamation in its pulsar-io.yaml, you can create a function instance with:

bin/pulsar-admin functions create \
  --function-type exclamation \
  --inputs persistent://public/default/input-1 \
  --output persistent://public/default/output-1