andygrove commented on issue #4142:
URL: 
https://github.com/apache/datafusion-comet/issues/4142#issuecomment-5007088053

   Closing this generic tracker in favor of specific issues for each Spark 4.2 
incompatibility:
   
   - #4963 — SQL Last Attempt Metric (SLAM) not propagated through Comet 
operators
   - #4964 — segment-tree window metrics unavailable under CometWindowExec
   - #4965 — UnionCodegenSuite partitioning-aware test inspects UnionExec that 
Comet replaces
   - #4966 — Comet native collect_set does not normalize NaN / -0.0 
(SPARK-57298)
   - #4967 — ANSI arithmetic overflow tests fail under Comet
   - #4968 — BloomFilter tests fail under Comet
   - #4969 — native Iceberg REST catalog scan test fails under Comet
   
   All `assume(!isSpark42Plus, ...)` guards and `IgnoreComet` references now 
point to these specific issues.


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