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perf: Improve performance of date truncate #2997

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@andygrove andygrove commented Dec 27, 2025 •
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Which issue does this PR close?

Closes #2998

Rationale for this change

Format Baseline Optimized Improvement
YEAR 142 µs 70 µs 51% faster
QUARTER 145 µs 114 µs 21% faster
MONTH 94 µs 76 µs 19% faster
WEEK 127 µs 78 µs 39% faster

What changes are included in this PR?

How are these changes tested?

@andygrove andygrove changed the title feat: Improve performance of date truncate perf: Improve performance of date truncate Dec 27, 2025
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codecov-commenter commented Dec 27, 2025 •
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Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 59.58%. Comparing base (f09f8af) to head (cddee7b).
⚠️ Report is 803 commits behind head on main.

Additional details and impacted files 
@@             Coverage Diff              @@
##               main    #2997      +/-   ##
============================================
+ Coverage     56.12%   59.58%   +3.46%     
- Complexity      976     1377     +401     
============================================
  Files           119      167      +48     
  Lines         11743    15493    +3750     
  Branches       2251     2569     +318     
============================================
+ Hits           6591     9232    +2641     
- Misses         4012     4962     +950     
- Partials       1140     1299     +159

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sqlbenchmark commented Jan 2, 2026

Comet Microbenchmark Results: CometDatetimeExpressionBenchmark

Commit: cddee7b - feat: Improve performance of date truncate

Benchmark Results

OpenJDK 64-Bit Server VM 17.0.17+10 on Linux 6.8.0-57-generic
AMD Ryzen 9 7950X 16-Core Processor
Date Truncate  - YEAR:                    Best Time(ms)   Avg Time(ms)   Stdev(ms)    Rate(M/s)   Per Row(ns)   Relative
------------------------------------------------------------------------------------------------------------------------
Spark                                                38             40           2         27.9          35.8       1.0X
Comet (Scan)                                         37             39           1         28.6          35.0       1.0X
Comet (Scan + Exec)                                  34             36           1         31.0          32.3       1.1X

OpenJDK 64-Bit Server VM 17.0.17+10 on Linux 6.8.0-57-generic
AMD Ryzen 9 7950X 16-Core Processor
Date Truncate  - YYYY:                    Best Time(ms)   Avg Time(ms)   Stdev(ms)    Rate(M/s)   Per Row(ns)   Relative
------------------------------------------------------------------------------------------------------------------------
Spark                                                33             36           2         31.7          31.6       1.0X
Comet (Scan)                                         34             35           1         30.8          32.5       1.0X
Comet (Scan + Exec)                                  33             34           1         32.1          31.2       1.0X

OpenJDK 64-Bit Server VM 17.0.17+10 on Linux 6.8.0-57-generic
AMD Ryzen 9 7950X 16-Core Processor
Date Truncate  - YY:                      Best Time(ms)   Avg Time(ms)   Stdev(ms)    Rate(M/s)   Per Row(ns)   Relative
------------------------------------------------------------------------------------------------------------------------
Spark                                                31             33           1         33.5          29.8       1.0X
Comet (Scan)                                         33             34           3         32.1          31.1       1.0X
Comet (Scan + Exec)                                  32             33           1         32.5          30.8       1.0X

OpenJDK 64-Bit Server VM 17.0.17+10 on Linux 6.8.0-57-generic
AMD Ryzen 9 7950X 16-Core Processor
Date Truncate  - MON:                     Best Time(ms)   Avg Time(ms)   Stdev(ms)    Rate(M/s)   Per Row(ns)   Relative
------------------------------------------------------------------------------------------------------------------------
Spark                                                33             34           1         31.8          31.4       1.0X
Comet (Scan)                                         34             35           1         30.9          32.4       1.0X
Comet (Scan + Exec)                                  33             34           1         32.0          31.2       1.0X

OpenJDK 64-Bit Server VM 17.0.17+10 on Linux 6.8.0-57-generic
AMD Ryzen 9 7950X 16-Core Processor
Date Truncate  - MONTH:                   Best Time(ms)   Avg Time(ms)   Stdev(ms)    Rate(M/s)   Per Row(ns)   Relative
------------------------------------------------------------------------------------------------------------------------
Spark                                                33             34           1         31.9          31.4       1.0X
Comet (Scan)                                         33             35           1         31.3          31.9       1.0X
Comet (Scan + Exec)                                  32             33           1         33.3          30.1       1.0X

OpenJDK 64-Bit Server VM 17.0.17+10 on Linux 6.8.0-57-generic
AMD Ryzen 9 7950X 16-Core Processor
Date Truncate  - MM:                      Best Time(ms)   Avg Time(ms)   Stdev(ms)    Rate(M/s)   Per Row(ns)   Relative
------------------------------------------------------------------------------------------------------------------------
Spark                                                33             34           1         31.8          31.5       1.0X
Comet (Scan)                                         33             34           1         31.7          31.5       1.0X
Comet (Scan + Exec)                                  31             33           1         33.4          30.0       1.1X

OpenJDK 64-Bit Server VM 17.0.17+10 on Linux 6.8.0-57-generic
AMD Ryzen 9 7950X 16-Core Processor
Date Truncate (Dictionary) - YEAR:        Best Time(ms)   Avg Time(ms)   Stdev(ms)    Rate(M/s)   Per Row(ns)   Relative
------------------------------------------------------------------------------------------------------------------------
Spark                                                31             33           1         34.1          29.3       1.0X
Comet (Scan)                                         33             34           1         31.9          31.3       0.9X
Comet (Scan + Exec)                                  33             34           1         32.1          31.1       0.9X

OpenJDK 64-Bit Server VM 17.0.17+10 on Linux 6.8.0-57-generic
AMD Ryzen 9 7950X 16-Core Processor
Date Truncate (Dictionary) - YYYY:        Best Time(ms)   Avg Time(ms)   Stdev(ms)    Rate(M/s)   Per Row(ns)   Relative
------------------------------------------------------------------------------------------------------------------------
Spark                                                31             32           1         34.2          29.2       1.0X
Comet (Scan)                                         32             34           1         32.5          30.8       1.0X
Comet (Scan + Exec)                                  31             33           1         33.4          30.0       1.0X

OpenJDK 64-Bit Server VM 17.0.17+10 on Linux 6.8.0-57-generic
AMD Ryzen 9 7950X 16-Core Processor
Date Truncate (Dictionary) - YY:          Best Time(ms)   Avg Time(ms)   Stdev(ms)    Rate(M/s)   Per Row(ns)   Relative
------------------------------------------------------------------------------------------------------------------------
Spark                                                30             32           1         34.4          29.1       1.0X
Comet (Scan)                                         32             33           1         32.7          30.6       1.0X
Comet (Scan + Exec)                                  32             33           1         33.1          30.2       1.0X

OpenJDK 64-Bit Server VM 17.0.17+10 on Linux 6.8.0-57-generic
AMD Ryzen 9 7950X 16-Core Processor
Date Truncate (Dictionary) - MON:         Best Time(ms)   Avg Time(ms)   Stdev(ms)    Rate(M/s)   Per Row(ns)   Relative
------------------------------------------------------------------------------------------------------------------------
Spark                                                32             34           1         32.4          30.8       1.0X
Comet (Scan)                                         32             34           3         32.6          30.7       1.0X
Comet (Scan + Exec)                                  31             32           1         33.3          30.0       1.0X

OpenJDK 64-Bit Server VM 17.0.17+10 on Linux 6.8.0-57-generic
AMD Ryzen 9 7950X 16-Core Processor
Date Truncate (Dictionary) - MONTH:       Best Time(ms)   Avg Time(ms)   Stdev(ms)    Rate(M/s)   Per Row(ns)   Relative
------------------------------------------------------------------------------------------------------------------------
Spark                                                33             34           1         31.4          31.9       1.0X
Comet (Scan)                                         32             33           1         32.7          30.6       1.0X
Comet (Scan + Exec)                                  31             33           1         33.3          30.0       1.1X

OpenJDK 64-Bit Server VM 17.0.17+10 on Linux 6.8.0-57-generic
AMD Ryzen 9 7950X 16-Core Processor
Date Truncate (Dictionary) - MM:          Best Time(ms)   Avg Time(ms)   Stdev(ms)    Rate(M/s)   Per Row(ns)   Relative
------------------------------------------------------------------------------------------------------------------------
Spark                                                32             33           1         32.3          30.9       1.0X
Comet (Scan)                                         32             33           1         32.8          30.5       1.0X
Comet (Scan + Exec)                                  32             33           1         33.1          30.2       1.0X

OpenJDK 64-Bit Server VM 17.0.17+10 on Linux 6.8.0-57-generic
AMD Ryzen 9 7950X 16-Core Processor
Timestamp Truncate  - YEAR:               Best Time(ms)   Avg Time(ms)   Stdev(ms)    Rate(M/s)   Per Row(ns)   Relative
------------------------------------------------------------------------------------------------------------------------
Spark                                               105            105           1         10.0          99.7       1.0X
Comet (Scan)                                        101            102           0         10.3          96.7       1.0X
Comet (Scan + Exec)                                 314            315           1          3.3         299.2       0.3X

OpenJDK 64-Bit Server VM 17.0.17+10 on Linux 6.8.0-57-generic
AMD Ryzen 9 7950X 16-Core Processor
Timestamp Truncate  - YYYY:               Best Time(ms)   Avg Time(ms)   Stdev(ms)    Rate(M/s)   Per Row(ns)   Relative
------------------------------------------------------------------------------------------------------------------------
Spark                                               104            105           1         10.0          99.5       1.0X
Comet (Scan)                                        101            102           1         10.4          96.4       1.0X
Comet (Scan + Exec)                                 315            318           2          3.3         300.4       0.3X

OpenJDK 64-Bit Server VM 17.0.17+10 on Linux 6.8.0-57-generic
AMD Ryzen 9 7950X 16-Core Processor
Timestamp Truncate  - YY:                 Best Time(ms)   Avg Time(ms)   Stdev(ms)    Rate(M/s)   Per Row(ns)   Relative
------------------------------------------------------------------------------------------------------------------------
Spark                                               103            105           1         10.1          98.6       1.0X
Comet (Scan)                                        101            102           1         10.4          96.4       1.0X
Comet (Scan + Exec)                                 313            314           1          3.4         298.5       0.3X

OpenJDK 64-Bit Server VM 17.0.17+10 on Linux 6.8.0-57-generic
AMD Ryzen 9 7950X 16-Core Processor
Timestamp Truncate  - MON:                Best Time(ms)   Avg Time(ms)   Stdev(ms)    Rate(M/s)   Per Row(ns)   Relative
------------------------------------------------------------------------------------------------------------------------
Spark                                               104            105           1         10.1          99.4       1.0X
Comet (Scan)                                        102            103           1         10.3          96.9       1.0X
Comet (Scan + Exec)                                 264            265           1          4.0         251.7       0.4X

OpenJDK 64-Bit Server VM 17.0.17+10 on Linux 6.8.0-57-generic
AMD Ryzen 9 7950X 16-Core Processor
Timestamp Truncate  - MONTH:              Best Time(ms)   Avg Time(ms)   Stdev(ms)    Rate(M/s)   Per Row(ns)   Relative
------------------------------------------------------------------------------------------------------------------------
Spark                                               104            105           0         10.1          99.4       1.0X
Comet (Scan)                                        102            103           1         10.3          97.5       1.0X
Comet (Scan + Exec)                                 269            270           1          3.9         256.4       0.4X

OpenJDK 64-Bit Server VM 17.0.17+10 on Linux 6.8.0-57-generic
AMD Ryzen 9 7950X 16-Core Processor
Timestamp Truncate  - MM:                 Best Time(ms)   Avg Time(ms)   Stdev(ms)    Rate(M/s)   Per Row(ns)   Relative
------------------------------------------------------------------------------------------------------------------------
Spark                                               104            105           1         10.1          99.4       1.0X
Comet (Scan)                                        105            106           1         10.0         100.5       1.0X
Comet (Scan + Exec)                                 276            277           1          3.8         263.3       0.4X

OpenJDK 64-Bit Server VM 17.0.17+10 on Linux 6.8.0-57-generic
AMD Ryzen 9 7950X 16-Core Processor
Timestamp Truncate  - DAY:                Best Time(ms)   Avg Time(ms)   Stdev(ms)    Rate(M/s)   Per Row(ns)   Relative
------------------------------------------------------------------------------------------------------------------------
Spark                                                88             89           1         11.9          84.1       1.0X
Comet (Scan)                                         85             86           1         12.3          81.2       1.0X
Comet (Scan + Exec)                                 224            225           1          4.7         214.1       0.4X

OpenJDK 64-Bit Server VM 17.0.17+10 on Linux 6.8.0-57-generic
AMD Ryzen 9 7950X 16-Core Processor
Timestamp Truncate  - DD:                 Best Time(ms)   Avg Time(ms)   Stdev(ms)    Rate(M/s)   Per Row(ns)   Relative
------------------------------------------------------------------------------------------------------------------------
Spark                                                87             89           1         12.0          83.0       1.0X
Comet (Scan)                                         85             86           1         12.3          81.4       1.0X
Comet (Scan + Exec)                                 224            225           1          4.7         213.9       0.4X

OpenJDK 64-Bit Server VM 17.0.17+10 on Linux 6.8.0-57-generic
AMD Ryzen 9 7950X 16-Core Processor
Timestamp Truncate  - HOUR:               Best Time(ms)   Avg Time(ms)   Stdev(ms)    Rate(M/s)   Per Row(ns)   Relative
------------------------------------------------------------------------------------------------------------------------
Spark                                                94             95           1         11.2          89.5       1.0X
Comet (Scan)                                         92             93           1         11.5          87.3       1.0X
Comet (Scan + Exec)                                 186            188           1          5.6         177.4       0.5X

OpenJDK 64-Bit Server VM 17.0.17+10 on Linux 6.8.0-57-generic
AMD Ryzen 9 7950X 16-Core Processor
Timestamp Truncate  - MINUTE:             Best Time(ms)   Avg Time(ms)   Stdev(ms)    Rate(M/s)   Per Row(ns)   Relative
------------------------------------------------------------------------------------------------------------------------
Spark                                                80             81           1         13.2          76.0       1.0X
Comet (Scan)                                         77             78           1         13.7          73.3       1.0X
Comet (Scan + Exec)                                 143            144           1          7.3         136.1       0.6X

OpenJDK 64-Bit Server VM 17.0.17+10 on Linux 6.8.0-57-generic
AMD Ryzen 9 7950X 16-Core Processor
Timestamp Truncate  - SECOND:             Best Time(ms)   Avg Time(ms)   Stdev(ms)    Rate(M/s)   Per Row(ns)   Relative
------------------------------------------------------------------------------------------------------------------------
Spark                                                31             32           1         33.7          29.7       1.0X
Comet (Scan)                                         28             29           1         37.1          26.9       1.1X
Comet (Scan + Exec)                                 101            102           1         10.4          95.9       0.3X

OpenJDK 64-Bit Server VM 17.0.17+10 on Linux 6.8.0-57-generic
AMD Ryzen 9 7950X 16-Core Processor
Timestamp Truncate  - WEEK:               Best Time(ms)   Avg Time(ms)   Stdev(ms)    Rate(M/s)   Per Row(ns)   Relative
------------------------------------------------------------------------------------------------------------------------
Spark                                                98             99           1         10.7          93.5       1.0X
Comet (Scan)                                         96             98           2         10.9          91.7       1.0X
Comet (Scan + Exec)                                 252            257           2          4.2         240.5       0.4X

OpenJDK 64-Bit Server VM 17.0.17+10 on Linux 6.8.0-57-generic
AMD Ryzen 9 7950X 16-Core Processor
Timestamp Truncate  - QUARTER:            Best Time(ms)   Avg Time(ms)   Stdev(ms)    Rate(M/s)   Per Row(ns)   Relative
------------------------------------------------------------------------------------------------------------------------
Spark                                               122            123           1          8.6         116.4       1.0X
Comet (Scan)                                        117            119           2          9.0         111.4       1.0X
Comet (Scan + Exec)                                 314            315           1          3.3         299.4       0.4X

OpenJDK 64-Bit Server VM 17.0.17+10 on Linux 6.8.0-57-generic
AMD Ryzen 9 7950X 16-Core Processor
Timestamp Truncate (Dictionary) - YEAR:   Best Time(ms)   Avg Time(ms)   Stdev(ms)    Rate(M/s)   Per Row(ns)   Relative
------------------------------------------------------------------------------------------------------------------------
Spark                                                98             98           1         10.7          93.2       1.0X
Comet (Scan)                                         95             95           0         11.1          90.2       1.0X
Comet (Scan + Exec)                                 323            325           1          3.2         308.4       0.3X

OpenJDK 64-Bit Server VM 17.0.17+10 on Linux 6.8.0-57-generic
AMD Ryzen 9 7950X 16-Core Processor
Timestamp Truncate (Dictionary) - YYYY:   Best Time(ms)   Avg Time(ms)   Stdev(ms)    Rate(M/s)   Per Row(ns)   Relative
------------------------------------------------------------------------------------------------------------------------
Spark                                                98             99           1         10.7          93.1       1.0X
Comet (Scan)                                         95             96           1         11.1          90.4       1.0X
Comet (Scan + Exec)                                 324            325           1          3.2         308.9       0.3X

OpenJDK 64-Bit Server VM 17.0.17+10 on Linux 6.8.0-57-generic
AMD Ryzen 9 7950X 16-Core Processor
Timestamp Truncate (Dictionary) - YY:     Best Time(ms)   Avg Time(ms)   Stdev(ms)    Rate(M/s)   Per Row(ns)   Relative
------------------------------------------------------------------------------------------------------------------------
Spark                                                97            101           9         10.8          92.8       1.0X
Comet (Scan)                                         94             95           0         11.1          89.9       1.0X
Comet (Scan + Exec)                                 324            325           1          3.2         309.5       0.3X

OpenJDK 64-Bit Server VM 17.0.17+10 on Linux 6.8.0-57-generic
AMD Ryzen 9 7950X 16-Core Processor
Timestamp Truncate (Dictionary) - MON:    Best Time(ms)   Avg Time(ms)   Stdev(ms)    Rate(M/s)   Per Row(ns)   Relative
------------------------------------------------------------------------------------------------------------------------
Spark                                                98            101           9         10.7          93.5       1.0X
Comet (Scan)                                         95             96           0         11.0          90.8       1.0X
Comet (Scan + Exec)                                 278            279           1          3.8         265.4       0.4X

OpenJDK 64-Bit Server VM 17.0.17+10 on Linux 6.8.0-57-generic
AMD Ryzen 9 7950X 16-Core Processor
Timestamp Truncate (Dictionary) - MONTH:  Best Time(ms)   Avg Time(ms)   Stdev(ms)    Rate(M/s)   Per Row(ns)   Relative
------------------------------------------------------------------------------------------------------------------------
Spark                                                98            100           2         10.7          93.7       1.0X
Comet (Scan)                                         95             96           1         11.0          91.0       1.0X
Comet (Scan + Exec)                                 277            278           1          3.8         264.4       0.4X

OpenJDK 64-Bit Server VM 17.0.17+10 on Linux 6.8.0-57-generic
AMD Ryzen 9 7950X 16-Core Processor
Timestamp Truncate (Dictionary) - MM:     Best Time(ms)   Avg Time(ms)   Stdev(ms)    Rate(M/s)   Per Row(ns)   Relative
------------------------------------------------------------------------------------------------------------------------
Spark                                                98             99           1         10.7          93.8       1.0X
Comet (Scan)                                         95             96           0         11.0          91.1       1.0X
Comet (Scan + Exec)                                 278            279           1          3.8         265.4       0.4X

OpenJDK 64-Bit Server VM 17.0.17+10 on Linux 6.8.0-57-generic
AMD Ryzen 9 7950X 16-Core Processor
Timestamp Truncate (Dictionary) - DAY:    Best Time(ms)   Avg Time(ms)   Stdev(ms)    Rate(M/s)   Per Row(ns)   Relative
------------------------------------------------------------------------------------------------------------------------
Spark                                                74             75           1         14.2          70.6       1.0X
Comet (Scan)                                         71             72           1         14.7          67.8       1.0X
Comet (Scan + Exec)                                 232            233           1          4.5         221.4       0.3X

OpenJDK 64-Bit Server VM 17.0.17+10 on Linux 6.8.0-57-generic
AMD Ryzen 9 7950X 16-Core Processor
Timestamp Truncate (Dictionary) - DD:     Best Time(ms)   Avg Time(ms)   Stdev(ms)    Rate(M/s)   Per Row(ns)   Relative
------------------------------------------------------------------------------------------------------------------------
Spark                                                74             75           1         14.1          70.8       1.0X
Comet (Scan)                                         71             72           0         14.8          67.7       1.0X
Comet (Scan + Exec)                                 233            234           1          4.5         222.0       0.3X

OpenJDK 64-Bit Server VM 17.0.17+10 on Linux 6.8.0-57-generic
AMD Ryzen 9 7950X 16-Core Processor
Timestamp Truncate (Dictionary) - HOUR:   Best Time(ms)   Avg Time(ms)   Stdev(ms)    Rate(M/s)   Per Row(ns)   Relative
------------------------------------------------------------------------------------------------------------------------
Spark                                                72             75           5         14.5          69.0       1.0X
Comet (Scan)                                         70             71           1         15.0          66.5       1.0X
Comet (Scan + Exec)                                 191            193           3          5.5         181.9       0.4X

OpenJDK 64-Bit Server VM 17.0.17+10 on Linux 6.8.0-57-generic
AMD Ryzen 9 7950X 16-Core Processor
Timestamp Truncate (Dictionary) - MINUTE:  Best Time(ms)   Avg Time(ms)   Stdev(ms)    Rate(M/s)   Per Row(ns)   Relative
------------------------------------------------------------------------------------------------------------------------
Spark                                                73             73           1         14.4          69.3       1.0X
Comet (Scan)                                         70             71           1         15.0          66.7       1.0X
Comet (Scan + Exec)                                 146            147           1          7.2         139.5       0.5X

OpenJDK 64-Bit Server VM 17.0.17+10 on Linux 6.8.0-57-generic
AMD Ryzen 9 7950X 16-Core Processor
Timestamp Truncate (Dictionary) - SECOND:  Best Time(ms)   Avg Time(ms)   Stdev(ms)    Rate(M/s)   Per Row(ns)   Relative
------------------------------------------------------------------------------------------------------------------------
Spark                                                26             28           1         39.6          25.3       1.0X
Comet (Scan)                                         23             24           1         44.9          22.3       1.1X
Comet (Scan + Exec)                                 100            100           1         10.5          95.0       0.3X

OpenJDK 64-Bit Server VM 17.0.17+10 on Linux 6.8.0-57-generic
AMD Ryzen 9 7950X 16-Core Processor
Timestamp Truncate (Dictionary) - WEEK:   Best Time(ms)   Avg Time(ms)   Stdev(ms)    Rate(M/s)   Per Row(ns)   Relative
------------------------------------------------------------------------------------------------------------------------
Spark                                                92             93           1         11.4          87.9       1.0X
Comet (Scan)                                         90             90           0         11.7          85.7       1.0X
Comet (Scan + Exec)                                 264            265           1          4.0         251.6       0.3X

OpenJDK 64-Bit Server VM 17.0.17+10 on Linux 6.8.0-57-generic
AMD Ryzen 9 7950X 16-Core Processor
Timestamp Truncate (Dictionary) - QUARTER:  Best Time(ms)   Avg Time(ms)   Stdev(ms)    Rate(M/s)   Per Row(ns)   Relative
-------------------------------------------------------------------------------------------------------------------------
Spark                                                118            121           6          8.9         112.7       1.0X
Comet (Scan)                                         115            117           2          9.1         109.5       1.0X
Comet (Scan + Exec)                                  330            332           2          3.2         314.9       0.4X

Automated benchmark run by dfbench

@apache apache deleted a comment from sqlbenchmark Jan 2, 2026
@apache apache deleted a comment from sqlbenchmark Jan 2, 2026
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Improve performance of date truncate

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@andygrove @codecov-commenter @sqlbenchmark