Copilot commented on code in PR #12855:
URL: https://github.com/apache/gluten/pull/12855#discussion_r3835553821


##########
.github/workflows/delta_spark_ut.yml:
##########
@@ -494,11 +498,112 @@ jobs:
             --expected-shards "${{ env.DELTA_NUM_SHARDS }}" \
             --known-failures 
.github/workflows/util/delta-spark-ut/known-failures.txt \
             --flaky-tests 
.github/workflows/util/delta-spark-ut/flaky-tests.txt \
-            --baseline-out aggregated/known-failures.txt
+            --baseline-out aggregated/known-failures.txt \
+            --pruned-baseline-out aggregated/pruned-known-failures.txt

Review Comment:
   The scheduled workflow may still open/update the baseline PR even when the 
run has global regressions: `delta-spark-aggregate` does not fail on 
regressions by default, so `delta-spark-update-baseline` can run as long as 
aggregation succeeds. This can create a baseline-update PR that will be 
red/unmergeable due to the regressions, adding noise. Pass 
`--fail-on-regression true` (or otherwise gate the update job on a 
regression-free run) so the PR automation only runs on clean nightlies.



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