andygrove commented on code in PR #6740:
URL: https://github.com/apache/datafusion-comet/pull/6740#discussion_r4209165178
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native/spark-expr/src/datetime_funcs/timestamp_trunc.rs:
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@@ -41,20 +41,25 @@ pub struct TimestampTruncExpr {
/// `Arc<str>` so it can be cheaply cloned onto Arrow `Timestamp` data
types without
/// reallocating, and parsed once into a `chrono::TimeZone` per batch.
timezone: Arc<str>,
+ /// Whether SECOND and MILLISECOND truncation wraps below the smallest
timestamp, as Spark
+ /// did before 4.2.0, instead of raising `long overflow` as 4.2.0 does
(SPARK-56663).
Review Comment:
I don't think we can predict the behavior of future Spark versions
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