<…>function data, see the
reference for the box.space._func space.
|The possible options are|:
if_not_exists = true|false (default = false) –
true means the<…>
https://www.tarantool.io/en/doc/latest/reference/reference_lua/box_schema/func_create/
Some SQL options that can be passed to func_create are not listed here: exports, param_list, returns.
Source: https://github.com/tarantool/tarantool/blob/28ec245d0a7ed4f7f07547ba0d22724db83df2a5/src/box/lua/schema.lua#L3047