andygrove commented on code in PR #6740:
URL: https://github.com/apache/datafusion-comet/pull/6740#discussion_r4208613562
##########
native/proto/src/proto/expr.proto:
##########
@@ -597,6 +597,11 @@ message TruncTimestamp {
Expr format = 1;
Expr child = 2;
string timezone = 3;
+ // Whether SECOND and MILLISECOND truncation wraps when the result would
fall below the
+ // smallest timestamp. Spark before 4.2.0 wraps the Long subtraction; 4.2.0
(SPARK-56663)
+ // raises `long overflow` like every other unit. This tracks the Spark
version Comet is
+ // running against.
+ bool wrap_second_millisecond_overflow = 4;
Review Comment:
Yes
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