MaxGekk commented on issue #26314: [SPARK-29371][SQL] Support interval field 
values with fractional parts
URL: https://github.com/apache/spark/pull/26314#issuecomment-548291510
 
 
   I modified slightly the benchmark and append fractions:
   ```diff
   diff --git 
a/sql/core/src/test/scala/org/apache/spark/sql/execution/benchmark/IntervalBenchmark.scala
 
b/sql/core/src/test/scala/org/apache/spark/sql/execution/benchmark/IntervalBenchmark.scala
   index d75cb1040f..ec32340b2b 100644
   --- 
a/sql/core/src/test/scala/org/apache/spark/sql/execution/benchmark/IntervalBenchmark.scala
   +++ 
b/sql/core/src/test/scala/org/apache/spark/sql/execution/benchmark/IntervalBenchmark.scala
   @@ -83,8 +83,8 @@ object IntervalBenchmark extends SqlBasedBenchmark {
      override def runBenchmarkSuite(mainArgs: Array[String]): Unit = {
        val N = 1000000
        val timeUnits = Seq(
   -      "13 months", "100 weeks", "9 days", "12 hours",
   -      "5 minutes", "45 seconds", "123 milliseconds", "567 microseconds")
   +      "13.123 months", "100.123 weeks", "9.123 days", "12.123 hours",
   +      "5.123 minutes", "45.123 seconds", "123.456 milliseconds", "567 
microseconds")
        val intervalToTest = ListBuffer[String]()
   ```
   and the results look not so nice:
   ```
   Java HotSpot(TM) 64-Bit Server VM 1.8.0_231-b11 on Mac OS X 10.15
   Intel(R) Core(TM) i7-4850HQ CPU @ 2.30GHz
   cast strings to intervals:                Best Time(ms)   Avg Time(ms)   
Stdev(ms)    Rate(M/s)   Per Row(ns)   Relative
   
------------------------------------------------------------------------------------------------------------------------
   prepare string w/ interval                          440            497       
   51          2.3         440.3       1.0X
   prepare string w/o interval                         370            392       
   21          2.7         370.3       1.2X
   1 units w/ interval                                5322           5414       
  142          0.2        5322.4       0.1X
   1 units w/o interval                               5002           5038       
   35          0.2        5002.2       0.1X
   2 units w/ interval                               18172          18285       
  189          0.1       18172.0       0.0X
   2 units w/o interval                              17899          18278       
  511          0.1       17899.4       0.0X
   3 units w/ interval                               30881          31481       
  665          0.0       30880.5       0.0X
   3 units w/o interval                              30839          31600       
  664          0.0       30838.5       0.0X
   4 units w/ interval                               44694          45302       
  547          0.0       44693.9       0.0X
   4 units w/o interval                              42490          42599       
   99          0.0       42489.5       0.0X
   5 units w/ interval                               54424          54469       
   67          0.0       54424.5       0.0X
   5 units w/o interval                              54879          55015       
  161          0.0       54879.1       0.0X
   6 units w/ interval                               69155          69281       
  140          0.0       69154.8       0.0X
   6 units w/o interval                              68877          69018       
  156          0.0       68876.7       0.0X
   7 units w/ interval                               82116          82204       
  112          0.0       82116.4       0.0X
   7 units w/o interval                              81495          81641       
  144          0.0       81495.4       0.0X
   8 units w/ interval                               94609          94630       
   22          0.0       94608.7       0.0X
   8 units w/o interval                              93915          94099       
  180          0.0       93914.8       0.0X
   9 units w/ interval                               93132          95566       
 2126          0.0       93132.2       0.0X
   9 units w/o interval                              91703          94179       
  NaN          0.0       91703.1       0.0X
   ```
   The throughput is roughly ~10 interval strings with 8-9 units per second. 

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