coderfender commented on code in PR #3559:
URL: https://github.com/apache/datafusion-comet/pull/3559#discussion_r2893100582
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native/spark-expr/src/conversion_funcs/numeric.rs:
##########
@@ -913,6 +963,56 @@ pub(crate) fn cast_int_to_timestamp(
Ok(Arc::new(builder.finish().with_timezone_opt(target_tz.clone())) as
ArrayRef)
}
+pub(crate) fn cast_decimal_to_timestamp(
+ array_ref: &ArrayRef,
+ target_tz: &Option<Arc<str>>,
+ scale: i8,
+) -> SparkResult<ArrayRef> {
+ let arr = array_ref.as_primitive::<Decimal128Type>();
+ let scale_factor = 10_i128.pow(scale as u32);
+ let mut builder = TimestampMicrosecondBuilder::with_capacity(arr.len());
+
+ for i in 0..arr.len() {
+ if arr.is_null(i) {
+ builder.append_null();
+ } else {
+ let value = arr.value(i);
+ // Note: spark's big decimal
+ let value_256 = i256::from_i128(value);
+ let micros_256 = value_256 * i256::from_i128(MICROS_PER_SECOND as
i128);
+ let ts = micros_256 / i256::from_i128(scale_factor);
+ builder.append_value(ts.as_i128() as i64);
Review Comment:
@parthchandra , thank you for the comment. Spark doesn't support Eval Mode
for Decimal / Float/ Int type to timestamp casts and rather produces incorrect
values
Refer :
https://github.com/apache/spark/blob/972897433082b1a7136b877b4fa37970961169d0/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/Cast.scala#L791
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