'Do these built-in UDTF functions need to be registered before use in the Apache IoTDB?

"I want to use the built-in UDTF functions, but I don't know what they are. How can I find them? Before using it, do I need to register it? I don't know the reason about it.If someone knows it, please let me know. Apache IoTDB version: 0.13"enter image description here

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