[GitHub] [shardingsphere] xue2lang opened a new issue #8152: when use in search , sql will occur cartesian set

[GitBox <gi...@apache.org>]

xue2lang opened a new issue #8152:
URL: https://github.com/apache/shardingsphere/issues/8152


   ## Bug Report
   
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   ### Which version of ShardingSphere did you use?
   4.1.1 
   
   
   ### Which project did you use? ShardingSphere-JDBC or ShardingSphere-Proxy?
   ShardingSphere-JDBC
   
   
   ### Expected behavior
   database: db0,db1
   table：tb_0,tb_1  (every database has two table)
   shardingColumn: id  (database and table all use it)
   sql：select * from tb where id in (a,b)
   
   ShardingConditions： id in (a,b)
   id=a is in db0.tb0
   id=b is in db1.tb1
   
   
   expect：
   
   select * from db0.tb0 in (a,b)   # will be better: select * from db0.tb0 in (a);
   select * from db1.tb1 in (a,b)   #  will be better:  select * from db1.tb1 in (b)
   
   ### Actual behavior
   
   sql behavior is cartesian set
   
   eg:
   select * from db0.tb0 in (a,b)
   select * from db0.tb1 in (a,b)
   select * from db1.tb0 in (a,b)
   select * from db1.tb1 in (a,b)
   
   ### Reason analyze (If you can)
   code：org.apache.shardingsphere.sharding.route.engine.type.standard.ShardingStandardRoutingEngine#route0
   
   not bind route value with every database when routeDataSources ,only return the database collection 
   
   so when routeTables ,every route value will be to route all tables for every database ，return cartesian set
   
   ![Uploading image.png…]()
   
   
   ### Steps to reproduce the behavior, such as: SQL to execute, sharding rule configuration, when exception occur etc.
   
   has any plan to optimize it ???  or have some good idea
   
   expect：
   select * from db0.tb0 in (a,b)   # will be better: select * from db0.tb0 in (a);
   select * from db1.tb1 in (a,b)   #  will be better:  select * from db1.tb1 in (b)
   ### Example codes for reproduce this issue (such as a github link).
   
   i want to change code when routeDataSources ,bind every route value to database ,but i donot know it will produce other problem??
   
   
   
   


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[GitHub] [shardingsphere] kimmking closed issue #8152: when use in search , sql will occur cartesian set

[GitBox <gi...@apache.org>]

kimmking closed issue #8152:
URL: https://github.com/apache/shardingsphere/issues/8152


   


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[GitHub] [shardingsphere] kimmking commented on issue #8152: when use in search , sql will occur cartesian set

[GitBox <gi...@apache.org>]

kimmking commented on issue #8152:
URL: https://github.com/apache/shardingsphere/issues/8152#issuecomment-726632475


   It's a design so far.
   


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