osipovartem commented on PR #26145:
URL: https://github.com/apache/datafusion/pull/26145#issuecomment-6087861930

   I checked the latest Codecov `compare/file` report (head `c9dbd63`) line by 
line. The 74.09% patch figure includes test-only code and partial coverage for 
the error branch of `?` in otherwise exercised tests. In the new CASE metadata 
runtime helper, the four fully missed lines are defensive `internal_err!` 
branches for an inconsistent internal work stack; the ordinary, 
conflicting-metadata, nested, cast/alias, scalar-UDF, higher-order-UDF, and 
depth-limited paths have direct tests. I do not think manufacturing malformed 
internal state solely to raise the patch percentage would improve the contract 
coverage. The PR remains draft for the separate follow-up work described above.


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