Mogball opened a new pull request #3509: Add Table performance improvements
URL: https://github.com/apache/incubator-superset/pull/3509
 
 
   Reduces the number of database requests issued during "Add Table". Testing 
on a local environment with the example datasets gave about a 4.5x speed up.
   
   - Added more performant "check if table exists" and "get dialect" functions
   - Removed queries and calls to `session.commit()` from the inside of loops
 
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