dongjoon-hyun commented on a change in pull request #30379:
URL: https://github.com/apache/spark/pull/30379#discussion_r523487480



##########
File path: sql/core/benchmarks/SubExprEliminationBenchmark-results.txt
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@@ -7,9 +7,9 @@ OpenJDK 64-Bit Server VM 1.8.0_265-b01 on Mac OS X 10.15.6
 Intel(R) Core(TM) i7-9750H CPU @ 2.60GHz
 from_json as subExpr:                      Best Time(ms)   Avg Time(ms)   
Stdev(ms)    Rate(M/s)   Per Row(ns)   Relative
 
-------------------------------------------------------------------------------------------------------------------------
-subexpressionElimination on, codegen on             2303           2543        
 238          0.0    23029833.1       1.0X
-subexpressionElimination on, codegen off           23107          23520        
 427          0.0   231069443.3       0.1X
-subexpressionElimination off, codegen on           23363          23848        
 421          0.0   233634044.9       0.1X
-subexpressionElimination off, codegen off          22997          23355        
 438          0.0   229974135.0       0.1X
+subexpressionElimination off, codegen on           24841          25365        
 803          0.0   248412787.5       1.0X
+subexpressionElimination off, codegen off          25344          26205        
 941          0.0   253442656.5       1.0X
+subexpressionElimination on, codegen on             2883           3019        
 119          0.0    28833086.8       8.6X

Review comment:
       Nice. It's clearly `8.6x`. :)




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