alamb commented on code in PR #18360:
URL: https://github.com/apache/datafusion/pull/18360#discussion_r2474653373
##########
datafusion/functions/src/datetime/date_trunc.rs:
##########
@@ -455,36 +456,56 @@ fn general_date_trunc_array_fine_granularity<T:
ArrowTimestampType>(
array: &PrimitiveArray<T>,
granularity: &str,
) -> Result<ArrayRef> {
- let unit = match (tu, granularity) {
- (Second, "minute") => Some(Int64Array::new_scalar(60)),
- (Second, "hour") => Some(Int64Array::new_scalar(3600)),
- (Second, "day") => Some(Int64Array::new_scalar(86400)),
-
- (Millisecond, "second") => Some(Int64Array::new_scalar(1_000)),
- (Millisecond, "minute") => Some(Int64Array::new_scalar(60_000)),
- (Millisecond, "hour") => Some(Int64Array::new_scalar(3_600_000)),
- (Millisecond, "day") => Some(Int64Array::new_scalar(86_400_000)),
-
- (Microsecond, "millisecond") => Some(Int64Array::new_scalar(1_000)),
- (Microsecond, "second") => Some(Int64Array::new_scalar(1_000_000)),
- (Microsecond, "minute") => Some(Int64Array::new_scalar(60_000_000)),
- (Microsecond, "hour") => Some(Int64Array::new_scalar(3_600_000_000)),
- (Microsecond, "day") => Some(Int64Array::new_scalar(86_400_000_000)),
-
- (Nanosecond, "microsecond") => Some(Int64Array::new_scalar(1_000)),
- (Nanosecond, "millisecond") => Some(Int64Array::new_scalar(1_000_000)),
- (Nanosecond, "second") => Some(Int64Array::new_scalar(1_000_000_000)),
- (Nanosecond, "minute") => Some(Int64Array::new_scalar(60_000_000_000)),
- (Nanosecond, "hour") =>
Some(Int64Array::new_scalar(3_600_000_000_000)),
- (Nanosecond, "day") =>
Some(Int64Array::new_scalar(86_400_000_000_000)),
+ let unit: Option<i64> = match (tu, granularity) {
Review Comment:
The key idea here is to make this code faster by reusing the allocation and
operating in place rather than allocating new arrays
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