waynexia opened a new pull request, #16859:
URL: https://github.com/apache/datafusion/pull/16859
## Which issue does this PR close?
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- follow-up of #14593
## Rationale for this change
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Follows the comment
https://github.com/apache/datafusion/pull/14593#discussion_r1951334920 to
implement an array version of `date_trunc`.
While implementing, I found that there is a lot of code handling boring
calendar things, which is totally unrelated to some small granularities (less
or equal to "hour"). So I also cut them off. Benchmark shows this
simplification can bring 4x performance.
## What changes are included in this PR?
a faster implementation for `date_trunc` with granularities from
"microsecond" to "hour"
```
date_trunc_minute_1000 time: [16.600 µs 16.643 µs 16.684 µs]
Found 8 outliers among 100 measurements (8.00%)
8 (8.00%) low mild
date_trunc_minute_1000 time: [2.3474 µs 2.3519 µs 2.3579 µs]
change: [-85.946% -85.909% -85.870%] (p = 0.00 <
0.05)
Performance has improved.
Found 1 outliers among 100 measurements (1.00%)
1 (1.00%) high severe
```
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## Are these changes tested?
using existing unit tests
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## Are there any user-facing changes?
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