parthchandra commented on PR #5331:
URL: 
https://github.com/apache/datafusion-comet/pull/5331#issuecomment-5446647416

   > `ocs/source/user-guide/latest/iceberg.md`. The "Current limitations" list 
is where people look to find out why a scan fell back, and this PR adds three 
new entries to it: a transform sort key, a UUID sort key, and sort-merge 
disabled while Iceberg still reports an ordering. Could we add those? The `### 
Tuning` section above already documents `dataFileConcurrencyLimit` and looks 
like the right home for `sortMerge.enabled` and 
`sortMerge.maxFilesPerPartition`, including the note that this only does 
anything with Iceberg's `spark.sql.iceberg.planning.preserve-data-ordering` 
turned on. `configs.md` is generated so that one is fine.
   
   Added the transform-sort-key and UUID-sort-key fallbacks to "Current 
limitations", and documented `sortMerge.enabled + 
sortMerge.maxFilesPerPartition` under Tuning, including the 
`preserve-data-ordering `pre-requisite


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