[GitHub] [shardingsphere] roodkcab opened a new issue #15579: support multiple schema on same instance

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

roodkcab opened a new issue #15579:
URL: https://github.com/apache/shardingsphere/issues/15579


   ## Feature Request
   
   ### Is your feature request related to a problem?
   ```
           Preconditions.checkState(schemaNames.size() <= 1, "Can not support multiple different schema.");
   ```
   currently TablesContext will check schema number of select statement and throw exception on multiple schema detected.
   
   ### Describe the feature you would like.
   can we support multiple schema on same instance? for example, sql like below
   ```
   select t1.*, t2.* from test1.test t1, test2.test t2;
   ```
   
   if I comment this check, I can get a "partial correct" result in client side prepare, i.e. using text protocol. but error on server side prepare, due to wrong field schema.
   


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[GitHub] [shardingsphere] roodkcab commented on issue #15579: support multiple schema on same instance

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

roodkcab commented on issue #15579:
URL: https://github.com/apache/shardingsphere/issues/15579#issuecomment-1048510682


   since shardingsphere treat each schema as a separate instance, i.e. test1 and test2 are running on different physic instances, I didn't figure out an easy way to support this feature. any idea?


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