findepi commented on code in PR #16859:
URL: https://github.com/apache/datafusion/pull/16859#discussion_r2225382275
##########
datafusion/functions/src/datetime/date_trunc.rs:
##########
@@ -185,6 +187,21 @@ impl ScalarUDFImpl for DateTruncFunc {
) -> Result<ColumnarValue> {
let parsed_tz = parse_tz(tz_opt)?;
let array = as_primitive_array::<T>(array)?;
+
+ // fast path for fine granularities
+ if matches!(
+ granularity.as_str(),
+ "second" | "minute" | "millisecond" | "microsecond"
+ ) || (parsed_tz.is_none() && granularity.as_str() == "hour")
+ {
+ let result = general_date_trunc_array_fine_granularity(
Review Comment:
Does this assume zone offsets are multiples of a whole hour?
(for example, Asia/Kathmandu is +05:45)
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