peter-toth commented on issue #28041: [WIP][SPARK-30564][SQL] Improved extra 
new line and comment remove
URL: https://github.com/apache/spark/pull/28041#issuecomment-604923815
 
 
   Results for the benchmark in the JIRA 
(https://issues.apache.org/jira/browse/SPARK-30564) before this PR:
   ```
   parsing large select:                     Best Time(ms)   Avg Time(ms)   
Stdev(ms)    Rate(M/s)   Per Row(ns)   Relative
   
------------------------------------------------------------------------------------------------------------------------
   2500 select expressions                             314            806       
  612          0.0   313617893.0       0.0X
   ```
   After this PR:
   ```
   parsing large select:                     Best Time(ms)   Avg Time(ms)   
Stdev(ms)    Rate(M/s)   Per Row(ns)   Relative
   
------------------------------------------------------------------------------------------------------------------------
   2500 select expressions                             120            131       
   11          0.0   120476036.0       0.0X
   ```
   
   
https://github.com/apache/spark/pull/27078/files#diff-8d27bbf2f73a68bf0c2025f0702f7332R74
 before this PR:
   ```
   deeply nested struct field r/w:           Best Time(ms)   Avg Time(ms)   
Stdev(ms)    Rate(M/s)   Per Row(ns)   Relative
   
------------------------------------------------------------------------------------------------------------------------
   250 deep x 400 rows (read in-mem)                  1239           1256       
   25          0.1       12387.6       0.0X
   ```
   After this PR:
   ```
   deeply nested struct field r/w:           Best Time(ms)   Avg Time(ms)   
Stdev(ms)    Rate(M/s)   Per Row(ns)   Relative
   
------------------------------------------------------------------------------------------------------------------------
   250 deep x 400 rows (read in-mem)                   233            250       
   13          0.4        2329.8       0.1X
   ```
   

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