tuohai666 opened a new issue #4042: Use the two-stage parsing strategy URL: https://github.com/apache/incubator-shardingsphere/issues/4042 The first step uses a slightly weaker parsing strategy, SLL(*), that almost always works. If the first parsing step fails, try the full LL(*) parse. After failing the first step, we don't know whether it's a true syntax error or whether it's because the SLL(*) strategy wasn't strong enough. Input that passes the SLL(*) step is guaranteed to pass the full LL(*) , so there's no point in trying out that more expensive stratety. Input fails the second step is truly syntactically invalid.
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