dongjoon-hyun commented on a change in pull request #23964: [SPARK-26975][SQL] 
Support nested-column pruning over limit/sample/repartition
URL: https://github.com/apache/spark/pull/23964#discussion_r262214266
 
 

 ##########
 File path: sql/core/benchmarks/NestedSchemaPruningBenchmark-results.txt
 ##########
 @@ -4,37 +4,37 @@ Nested Schema Pruning Benchmark
 
 Java HotSpot(TM) 64-Bit Server VM 1.8.0_201-b09 on Mac OS X 10.14.3
 Intel(R) Core(TM) i9-8950HK CPU @ 2.90GHz
-Selection:                               Best/Avg Time(ms)    Rate(M/s)   Per 
Row(ns)   Relative
-------------------------------------------------------------------------------------------------
-Top-level column                                59 /   68         16.9         
 59.1       1.0X
-Nested column                                  180 /  186          5.6         
179.7       0.3X
+Selection:                                Best Time(ms)   Avg Time(ms)   
Stdev(ms)    Rate(M/s)   Per Row(ns)   Relative
+------------------------------------------------------------------------------------------------------------------------
+Top-level column                                     62             71         
  9         16.2          61.6       1.0X
+Nested column                                       178            185         
  6          5.6         178.0       0.3X
 
 Java HotSpot(TM) 64-Bit Server VM 1.8.0_201-b09 on Mac OS X 10.14.3
 Intel(R) Core(TM) i9-8950HK CPU @ 2.90GHz
-Limiting:                                Best/Avg Time(ms)    Rate(M/s)   Per 
Row(ns)   Relative
-------------------------------------------------------------------------------------------------
-Top-level column                               241 /  246          4.2         
240.9       1.0X
-Nested column                                 1828 / 1904          0.5        
1827.5       0.1X
+Limiting:                                 Best Time(ms)   Avg Time(ms)   
Stdev(ms)    Rate(M/s)   Per Row(ns)   Relative
+------------------------------------------------------------------------------------------------------------------------
+Top-level column                                    241            244         
  3          4.2         240.8       1.0X
+Nested column                                       358            371         
  8          2.8         358.2       0.7X
 
 Review comment:
   This and the next one is the scope of this PR.

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