waynexia commented on code in PR #16859:
URL: https://github.com/apache/datafusion/pull/16859#discussion_r2229628338
##########
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"
Review Comment:
Add some comments in 346ae5952
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