maugly24 commented on pull request #92:
URL: https://github.com/apache/sqoop/pull/92#issuecomment-799995775


   Hi hong ,
   
   I've reviewed your changes (both Github and issues.apache.org), but TBH in 
the current state I'm concerned both about the intention of the change, and the 
correctness as well.
   
   First of all:
   Could you please provide a bit more detail around what performance gain do 
you expect from this change and how did you measure it? Could you please 
provide also some automated testcase which would show the effect of this gain, 
and would ensure we don't loose it in the future?
   
   On the front of correctness:
   SQOOP-3149 introduced the line you'd like to remove, and if I do remember 
correctly absolutely intentionally. Because of this reason:
   Could you please provide automated test cases which ensures that SQOOP-3149 
changes won't be undone by your change (so we keep the current correctness 
around NULL column updates)?
   
   Many thanks in advance,
   Attila Szabo 


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