Github user gatorsmile commented on the issue:

    https://github.com/apache/spark/pull/17191
  
    We hit this issue multiple times. Although it looks not right to support it 
for the users of major enterprise RDBMS, two popular open source RDBMS 
PostgreSQL and MySQL support it. 
    
    This is the design decision we need to make. Should we keep the previous 
decision? @rxin @marmbrus @hvanhovell @cloud-fan Thanks!
    
    
    



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