fx19880617 opened a new issue #5716:
URL: https://github.com/apache/incubator-pinot/issues/5716


   By further support of queries involving multiple tables, we should try to 
prevent users creating table/schema with dot in the table name and column name.
   
   Then we can  distinguish [database].[table_name] in FROM clause and 
[table_name].[column_name] for identifiers.
   
   Current proposal is to 
   1. prevent users from creating table/schemas with dot. 
   2. adding a table config to allow the support for accepting the identifier 
format of [table].[column], this could be default to false for table created in 
previous pinot version but true for new created tables.
   3. adding a tooling for user to turn on this in table config.
   


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