[GitHub] [incubator-shardingsphere] codefairy08 edited a comment on issue #1908: In query route error

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codefairy08 edited a comment on issue #1908: In query route  error
URL: https://github.com/apache/incubator-shardingsphere/issues/1908#issuecomment-471486187
 
 
   @guowdxp it compute availableTargetDatabases using sharding condition, then use each availableTargetDatabases and sharding condition value compute actual table, it cause  datasource Cartesian with actual  table, when database sharding column is the same as table sharding column ,it execute  more actual sql, but the result is correct.  StandardRoutingEngine#routeDataSources method return a Map<String,List<RouteValue>>, key is datasource name, value is this datasource RouteValues
   , doSharding(availableTargetDatabases, databaseShardingValues) , split databaseShardingValues ，each databaseShardingValues with one element，StandardRoutingEngine#routeTables(final TableRule tableRule, final String routedDataSource, final List<RouteValue> tableShardingValues, Map<String,List<RouteValue>> datasourceRouteValues) ,when  database sharding column is the same as table sharding column,  use datasourceRouteValues compute actual tables。
   

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