Fokko commented on code in PR #3483:
URL: https://github.com/apache/iceberg-rust/pull/3483#discussion_r4308051395
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crates/iceberg/src/spec/values/datum.rs:
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@@ -1229,6 +1229,19 @@ impl Datum {
&self.r#type
}
+ /// Returns a copy whose literal is widened to `target` for the value
+ /// promotions `int` -> `long` and `float` -> `double`, so a value written
+ /// under the narrower type compares against a predicate bound to the wider
+ /// one. Any other `target` returns an unchanged copy; decimals already
+ /// compare across precisions.
+ pub(crate) fn promote_to(&self, target: &PrimitiveType) -> Datum {
+ match (&self.literal, target) {
+ (PrimitiveLiteral::Int(value), PrimitiveType::Long) =>
Datum::long(*value),
+ (PrimitiveLiteral::Float(value), PrimitiveType::Double) =>
Datum::double(value.0),
+ _ => self.clone(),
+ }
+ }
Review Comment:
Got it. I would suggest getting this fix in for now, since it fixes an
important issue. Maybe we can create a separate PR to assess the impact of
pushing the promotion down to the reader. I think that would simplify it a lot
and make it less error prone at the same time.
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