sdd commented on code in PR #269:
URL: https://github.com/apache/iceberg-rust/pull/269#discussion_r1527606344
##########
crates/iceberg/src/spec/transform.rs:
##########
@@ -261,6 +269,50 @@ impl Transform {
_ => self == other,
}
}
+ /// Projects predicate to `Transform`
+ pub fn project(&self, name: String, pred: &BoundPredicate) ->
Result<Option<Predicate>> {
+ let func = create_transform_function(self)?;
+
+ let projection = match self {
+ Transform::Bucket(_) => match pred {
+ BoundPredicate::Unary(expr) =>
Some(Predicate::Unary(UnaryExpression::new(
+ expr.op(),
+ Reference::new(name),
+ ))),
+ BoundPredicate::Binary(expr) => {
+ if expr.op() != PredicateOperator::Eq {
+ return Ok(None);
+ }
+
+ let result = match expr.as_primitive_literal() {
+ PrimitiveLiteral::Int(v) => func
+ .transform(Arc::new(Int32Array::from_value(v, 1)))?
+ .as_any()
+ .downcast_ref::<Int32Array>()
+ .ok_or_else(|| Error::new(ErrorKind::Unexpected,
"Failed to downcast"))?
+ .value(0),
+ PrimitiveLiteral::Long(v) => func
+ .transform(Arc::new(Int64Array::from_value(v, 1)))?
+ .as_any()
+ .downcast_ref::<Int32Array>()
Review Comment:
Should this be `Int64Array`?
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