lightyear007 opened a new issue #4028: If not hint values are set what's the 
routing behavior for HintShardingAlgorithm
URL: https://github.com/apache/incubator-shardingsphere/issues/4028
 
 
   According to sharding jdbc doc 
[https://shardingsphere.apache.org/document/current/cn/manual/sharding-jdbc/usage/hint/],
 if we want to use the forced routing, we have to implement a 
HintShardingAlgorithm. My question is that if we have configured a sharding 
rule using HintShardingAlgorithm, but we didn't set any hint values using the 
HintManager, then how sharding jdbc can get a clue of how to route the query?
   
   I tried this and found out, if no values are set, my HintShardingAlgorithm 
implementation code will not be executed. then i would what rule sharding jdbc 
is using in this case.
   
   Thanks
   Jacky

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