kumarUjjawal commented on code in PR #19640:
URL: https://github.com/apache/datafusion/pull/19640#discussion_r2660763937
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datafusion/functions/src/datetime/date_trunc.rs:
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@@ -374,6 +502,76 @@ impl ScalarUDFImpl for DateTruncFunc {
}
}
+const NANOS_PER_MICROSECOND: i64 = NANOSECONDS / MICROSECONDS;
+const NANOS_PER_MILLISECOND: i64 = NANOSECONDS / MILLISECONDS;
+const NANOS_PER_SECOND: i64 = NANOSECONDS;
+const NANOS_PER_MINUTE: i64 = 60 * NANOS_PER_SECOND;
+const NANOS_PER_HOUR: i64 = 60 * NANOS_PER_MINUTE;
+
+const MICROS_PER_MILLISECOND: i64 = MICROSECONDS / MILLISECONDS;
+const MICROS_PER_SECOND: i64 = MICROSECONDS;
+const MICROS_PER_MINUTE: i64 = 60 * MICROS_PER_SECOND;
+const MICROS_PER_HOUR: i64 = 60 * MICROS_PER_MINUTE;
+
+const MILLIS_PER_SECOND: i32 = MILLISECONDS as i32;
+const MILLIS_PER_MINUTE: i32 = 60 * MILLIS_PER_SECOND;
+const MILLIS_PER_HOUR: i32 = 60 * MILLIS_PER_MINUTE;
+
+const SECS_PER_MINUTE: i32 = 60;
+const SECS_PER_HOUR: i32 = 60 * SECS_PER_MINUTE;
+
+/// Truncate time in nanoseconds to the specified granularity
+fn truncate_time_nanos(value: i64, granularity: DateTruncGranularity) -> i64 {
Review Comment:
> On a side note, are there potentially kernels in arrow-rs that we could
reuse? Or there are none suitable?
I checked already but Arrow has `date_part` kernels for extraction but no
`date_trunc` kernels for Time types.
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