Copilot commented on code in PR #12829:
URL: https://github.com/apache/gluten/pull/12829#discussion_r3834496250


##########
.github/workflows/util/delta-spark-ut/README.md:
##########
@@ -190,9 +190,16 @@ list so it can't leak into the baseline):
 # regex matched against the failure message + stack (enforce mode).
 # one explicit pattern per known error, deliberately specific.
 Delta RoaringBitmapArray row index \d+ exceeds max representable value
-Delta bitmap row index cannot be negative: -?\d+
+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
+by [velox#18536](https://github.com/facebookincubator/velox/pull/18536) and
+picked up by the `dft-2026_08_21` Velox pin, so both patterns were removed and
+the suite is enforced again. It is kept here because it shows the shape of the

Review Comment:
   PR description says Gluten “currently pins dft-2026_08_17” and warns this 
must not merge before a Velox bump. In this branch, the pinned Velox branch is 
already `dft-2026_08_21` (see `ep/build-velox/src/get-velox.sh:21`). Please 
update the PR description / merge-block note so reviewers aren’t misled about 
whether it’s safe to drop the quarantines.



##########
.github/workflows/util/delta-spark-ut/README.md:
##########
@@ -190,9 +190,16 @@ list so it can't leak into the baseline):
 # regex matched against the failure message + stack (enforce mode).
 # one explicit pattern per known error, deliberately specific.
 Delta RoaringBitmapArray row index \d+ exceeds max representable value
-Delta bitmap row index cannot be negative: -?\d+
+Delta bitmap row index cannot be negative: -\d+

Review Comment:
   The README still shows the two DV regex patterns inside a code block, but 
`flaky-error-patterns.txt` is now empty. Since the “historical” disclaimer 
comes after the block, it’s easy to skim and mistake these for the current 
active patterns. Adding an explicit “HISTORICAL example” marker inside the 
block would prevent accidental copy/paste.



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