gatorsmile commented on issue #26549: [SPARK-29644][SQL][2.4] Corrected 
ShortType and ByteType mapping to SmallInt and TinyInt in JDBCUtils
URL: https://github.com/apache/spark/pull/26549#issuecomment-554851177
 
 
   How serious is it to the end users?  I tend to agree @maropu this is not a 
big issue. 
   
   You know, fixing this in the maintenance releases should be avoided. This 
will change the data type of the external schema. Normally, it will easily 
break the external applications. 
   
   Can we revert this? 

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