kramerul commented on PR #3674:
URL: https://github.com/apache/calcite/pull/3674#issuecomment-1943144254

   >  The title says something should not be used, but there is no test to tell 
me that the claim of the JIRA case is true or has been fixed by this PR.
   
   In the current code base, `mq.getRowCount` is used in most cases inside 
`computeSelfCost`. On the other hand, `estimatedRowCount` is only used in  some 
rare cases, which are fixed by this PR. As @rubenada already pointed out, there 
is also a javadoc, which states that the claim of the JIRA case is true. In my 
point of view, there is no need to prove this by a unit test.


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