cherrylzhao opened a new issue #2155: optimize performance for DAL SQL like 
show tables
URL: https://github.com/apache/incubator-shardingsphere/issues/2155
 
 
   if user config huge of actual tables in one logic table, execute show tables 
are very slow.
   we can get the logic tables from cached sharding-rule instead of fetching 
results from actual database, then filter by actual name.

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