andygrove opened a new pull request, #2996:
URL: https://github.com/apache/datafusion-comet/pull/2996
## Which issue does this PR close?
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## Rationale for this change
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Sub-day truncations (MICROSECOND, MILLISECOND, SECOND, MINUTE, HOUR) are
timezone-independent - truncating to the minute boundary is the same regardless
of timezone display. This allows simple integer arithmetic instead of expensive
DateTime conversions.
### Sub-day Formats (Optimized with Arithmetic)
| Format | Before | After | Speedup |
|-------------|--------|-------|---------------------------------|
| HOUR | 957 µs | 32 µs | ~30x faster (96.6% improvement) |
| MINUTE | 640 µs | 32 µs | ~20x faster (95% improvement) |
| SECOND | 405 µs | 32 µs | ~12x faster (92% improvement) |
| MILLISECOND | 430 µs | 32 µs | ~13x faster (92.6% improvement) |
| MICROSECOND | 435 µs | 27 µs | ~16x faster (93.7% improvement) |
### Non-UTC Timezone (America/New_York)
| Format | Before | After | Speedup |
|--------|--------|-------|---------------------------------|
| SECOND | 598 µs | 35 µs | ~17x faster (94.2% improvement) |
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