Function run_func

lua/sp.c:7020–7037

This runs some Lua code in context of on-going SQL stmt. Should not * start/commit/rollback ongoing transaction. Calling SQL stmt will cleanup on * error. */

 * start/commit/rollback ongoing transaction. Calling SQL stmt will cleanup on
 * error. */
static int run_func(struct sqlclntstate *clnt, int argcnt, char **err, int final)
{
    Lua L = clnt->sp->lua;
    int rc = lua_pcall(L, argcnt, LUA_MULTRET, 0);
    join_threads(clnt->sp);
    if (final || rc) {
        reset_stmts(clnt->sp);
        drop_temp_tables(clnt->sp);
    }
    if (rc) {
        if (lua_gettop(L) > 0 && !lua_isnil(L, -1)) {
            *err = strdup(luabb_tostring(L, -1));
        } else {
            *err = strdup("UDF failed");
        }
    }
    return rc;
}

/* TODO: This needs to be more robust - perhaps a hash table of Lua VMs per UDF
 * allowing us to invoke multiple UDFs per SQL statement. Also, test running