LuciferYang commented on PR #56648:
URL: https://github.com/apache/spark/pull/56648#issuecomment-4779137604

   Thanks @MaxGekk! Addressed both points in `33fc38af962`:
   
   1. Reworded the test comment to describe what the test actually verifies 
(the scan continues past the default-value replacement and still expands the 
later `${b}`), rather than implying the length adjustment is required — you're 
right that it passes either way, so the old wording was misleading.
   2. Updated the PR description to document the second production change 
(`value.toString` -> `String.valueOf(value)`, so a null resolver value renders 
as `"null"` instead of NPEing) and noted why it isn't user-facing: the sole 
caller, `ErrorClassesJSONReader`, already maps null message parameters to 
`"null"` before constructing the substitutor.
   


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