blinding-pixels commented on PR #23627:
URL: https://github.com/apache/datafusion/pull/23627#issuecomment-5013006018

   I see how my wording was confusing. The matrix uses a neutral synthetic 
operator, so it's a shared-contract test, not a universal operator contract 
test.
   
   It proves that once an operator enables Range satisfaction, the shared 
optimizer handles all 24 matrix combinations correctly. It does not prove that 
production aggregates, joins, and windows enable Range satisfaction or reach 
that shared logic correctly. `KeyPartitioningRequirementExec` enables Range 
satisfaction itself, so removing an opt-in or breaking an operator-specific 
path would leave the matrix green.
   
   The mutations show this:
   
   * Test 7 — aggregate preservation path
   * Test 13 — partitioned-join guard
   * Test 14 — join preservation path
   * Tests 6 and 8 — same aggregate RoundRobin path, so one is redundant
   
   To make the SLT file leaner, I could keep the neutral matrix for the shared 
contract and add a second Rust table using real aggregate and join plans. That 
would replace the optimizer-plan coverage of all the proposed SLT cases and 
allow them to be removed. The existing window SLTs would still protect the 
window operators. This would add roughly 80–100 lines to the existing Rust test 
file.
   
   I'm new to this codebase, so I'll defer to you on whether the added Rust 
coverage is worthwhile or you'd rather just drop the SLT cases.


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