xiangfu0 opened a new pull request, #19712:
URL: https://github.com/apache/pinot/pull/19712

   Port Rohit's latest #19120 commits onto the shared ordering stack, 
preserving author history and the default OFF behavior; the server streams 
ordered segment runs and merges them in bounded blocks.
   Try `SET useMultistageEngine=true; SET streamingSortedMailboxReceive=true; 
SET sortedSelectionMergeMode='AUTO'; SELECT key FROM myTable_OFFLINE ORDER BY 
key LIMIT 10;` on segments sorted by key; `OFF` restores the existing server 
path.
   158 focused source/merge tests and scoped style/license checks pass. Parent: 
https://github.com/apache/pinot/pull/19711; child: the sorted-join follow-up. 
Fresh cluster benchmarks remain pending; #19120 is left open for author 
coordination.
   


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