yadavay-amzn commented on PR #55858:
URL: https://github.com/apache/spark/pull/55858#issuecomment-4795635251

   Thanks @cloud-fan, glad the guard checks out. Addressed the round-2 items in 
5e9b8d2:
   
   - WriteDelta coverage: new `DeltaBasedMergeNondeterministicSuite` 
(merge-on-read) mirroring the reproduce-then-verify.
   - Folded the two near-duplicate group-based tests into one `rand()`-based 
test (rows + no group filter).
   - Updated the PR description for real this time (the `command == MERGE` 
gating, the `RowLevelOperationRuntimeGroupFiltering` `cond.deterministic` guard 
and why, and the new suites).
   
   For the remaining item - non-determinism in a MERGE action assignment (`SET 
x = uuid()`) landing on `MergeRows` - I filed a follow-up: SPARK-57685. PTAL.


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