Function LookupNamespaceNoError

src/backend/catalog/namespace.c:2939–2960

* LookupNamespaceNoError * Look up a schema name. * * Returns the namespace OID, or InvalidOid if not found. * * Note this does NOT perform any permissions check --- callers are * responsible for being sure that an appropriate check is made. * In the majority of cases LookupExplicitNamespace is preferable. */

 * In the majority of cases LookupExplicitNamespace is preferable.
 */
Oid
LookupNamespaceNoError(const char *nspname)
{
	/* check for pg_temp alias */
	if (strcmp(nspname, "pg_temp") == 0)
	{
		if (OidIsValid(myTempNamespace))
		{
			InvokeNamespaceSearchHook(myTempNamespace, true);
			return myTempNamespace;
		}

		/*
		 * Since this is used only for looking up existing objects, there is
		 * no point in trying to initialize the temp namespace here; and doing
		 * so might create problems for some callers. Just report "not found".
		 */
		return InvalidOid;
	}

	return get_namespace_oid(nspname, true);
}

/*
 * LookupExplicitNamespace