CuteChuanChuan opened a new pull request, #20076:
URL: https://github.com/apache/datafusion/pull/20076

   ## Which issue does this PR close?
   
   Related to #19994 - This PR extracts the benchmark code to allow performance 
comparison.
   
   ## Rationale for this change
   
   As pointed out by @alamb in #19994, this separates the microbenchmark code 
so that the benchmarking scripts can compare the optimization PR against main 
with the benchmark already in place.
   
   ## What changes are included in this PR?
   
   Adds a microbenchmark for the divide-by-zero protection pattern in 
`case_when.rs`:
   - Benchmarks with varying percentages of zeros (0%, 10%, 50%, 90%)
   - Compares `DivideByZeroProtection` pattern (where checked column matches 
divisor) vs  `ExpressionOrExpression` fallback (where they don't match)
   
   ## Are these changes tested?
   
   benchmark code only.
   
   ## Are there any user-facing changes?
   
   No.
   


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