Function getTSCurrentConfig

src/backend/utils/cache/ts_cache.c:555–583

 */

Oid
getTSCurrentConfig(bool emitError)
{
	/* if we have a cached value, return it */
	if (OidIsValid(TSCurrentConfigCache))
		return TSCurrentConfigCache;

	/* fail if GUC hasn't been set up yet */
	if (TSCurrentConfig == NULL || *TSCurrentConfig == '\0')
	{
		if (emitError)
			elog(ERROR, "text search configuration isn't set");
		else
			return InvalidOid;
	}

	if (TSConfigCacheHash == NULL)
	{
		/* First time through: initialize the tsconfig inval callback */
		init_ts_config_cache();
	}

	/* Look up the config */
	TSCurrentConfigCache =
		get_ts_config_oid(stringToQualifiedNameList(TSCurrentConfig),
						  !emitError);

	return TSCurrentConfigCache;
}

/* GUC check_hook for default_text_search_config */
bool