Copilot commented on code in PR #12829:
URL: https://github.com/apache/gluten/pull/12829#discussion_r3833621526


##########
.github/workflows/util/delta-spark-ut/README.md:
##########
@@ -193,6 +193,11 @@ Delta RoaringBitmapArray row index \d+ exceeds max 
representable value
 Delta bitmap row index cannot be negative: -?\d+

Review Comment:
   The regex example for a "cannot be negative" row index currently allows a 
missing minus sign (`-?\d+`), which is broader than the described error and 
undermines the note that patterns should be deliberately specific. Tighten it 
to match only negative integers.



##########
.github/workflows/util/delta-spark-ut/README.md:
##########
@@ -193,6 +193,11 @@ Delta RoaringBitmapArray row index \d+ exceeds max 
representable value
 Delta bitmap row index cannot be negative: -?\d+
 ```
 
+That example is historical: the root cause was a Velox scan bug
+([velox#18535](https://github.com/facebookincubator/velox/issues/18535)), fixed
+upstream, so both patterns have since been removed and the suite is enforced
+again. It is kept here because it shows the shape of the mechanism.

Review Comment:
   The PR description calls out that this must not merge until Gluten's pinned 
Velox revision includes the upstream fix commit. The new note says the bug is 
fixed upstream and the suite is enforced again, but it doesn't capture the 
dependency on the pinned Velox tag/commit, which risks accidental early merges 
on other branches.



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