let base_url = guc_string_parse(&OPENAI_BASE_URL, "vectors.openai_base");
and
GucRegistry::define_string_guc(
"vectors.openai_base_url",
"The base url of OpenAI or compatible server.",
"",
&OPENAI_BASE_URL,
GucContext::Userset,
GucFlags::default(),
);
I think those code don't matchs.
and