jorgecarleitao opened a new pull request #9297:
URL: https://github.com/apache/arrow/pull/9297
This PR improves the performance of certain time / date casts by using the
brand new API proposed in #9235 .
That API allows for a very fast execution of unary and infalible operations
on primitive arrays, and this PR leverages that for cast operations that
require some mathematical operation.
```
Switched to branch 'fast_unary'
Compiling arrow v3.0.0-SNAPSHOT
(/Users/jorgecarleitao/projects/arrow/rust/arrow)
Finished bench [optimized] target(s) in 1m 06s
Running
/Users/jorgecarleitao/projects/arrow/rust/target/release/deps/cast_kernels-25ee76597a8b997b
Gnuplot not found, using plotters backend
cast date64 to date32 512
time: [1.1668 us 1.1706 us 1.1749 us]
change: [-83.347% -83.248% -83.144%] (p = 0.00 <
0.05)
Performance has improved.
Found 5 outliers among 100 measurements (5.00%)
3 (3.00%) high mild
2 (2.00%) high severe
cast date32 to date64 512
time: [899.73 ns 930.58 ns 971.56 ns]
change: [-86.799% -86.520% -86.190%] (p = 0.00 <
0.05)
Performance has improved.
Found 10 outliers among 100 measurements (10.00%)
3 (3.00%) high mild
7 (7.00%) high severe
cast time32s to time32ms 512
time: [728.73 ns 732.33 ns 735.90 ns]
change: [-54.503% -54.201% -53.917%] (p = 0.00 <
0.05)
Performance has improved.
Found 2 outliers among 100 measurements (2.00%)
1 (1.00%) high mild
1 (1.00%) high severe
cast time64ns to time32s 512
time: [4.8374 us 4.8447 us 4.8526 us]
change: [-57.022% -56.791% -56.587%] (p = 0.00 <
0.05)
Performance has improved.
Found 8 outliers among 100 measurements (8.00%)
6 (6.00%) high mild
2 (2.00%) high severe
```
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