Function appendFunctionName

contrib/postgres_fdw/deparse.c:3507–3534

* appendFunctionName * Deparses function name from given function oid. */

 *		Deparses function name from given function oid.
 */
static void
appendFunctionName(Oid funcid, deparse_expr_cxt *context)
{
	StringInfo	buf = context->buf;
	HeapTuple	proctup;
	Form_pg_proc procform;
	const char *proname;

	proctup = SearchSysCache1(PROCOID, ObjectIdGetDatum(funcid));
	if (!HeapTupleIsValid(proctup))
		elog(ERROR, "cache lookup failed for function %u", funcid);
	procform = (Form_pg_proc) GETSTRUCT(proctup);

	/* Print schema name only if it's not pg_catalog */
	if (procform->pronamespace != PG_CATALOG_NAMESPACE)
	{
		const char *schemaname;

		schemaname = get_namespace_name(procform->pronamespace);
		appendStringInfo(buf, "%s.", quote_identifier(schemaname));
	}

	/* Always print the function name */
	proname = NameStr(procform->proname);
	appendStringInfoString(buf, quote_identifier(proname));

	ReleaseSysCache(proctup);
}

/*
 * Appends a sort or group clause.