feat: add BoundPredicateEvaluator

Author: sdd

crates/iceberg/src/expr/mod.rs

@@ -18,14 +18,13 @@
 //! This module contains expressions.
 
 mod term;
-
-use std::fmt::{Display, Formatter};
-
 pub use term::*;
 mod predicate;
+pub(crate) mod visitors;
+pub use predicate::*;
 
 use crate::spec::SchemaRef;
-pub use predicate::*;
+use std::fmt::{Display, Formatter};
 
 /// Predicate operators used in expressions.
 ///

crates/iceberg/src/expr/predicate.rs

@@ -116,6 +116,14 @@ impl<T> UnaryExpression<T> {
         debug_assert!(op.is_unary());
         Self { op, term }
     }
+
+    pub(crate) fn term(&self) -> &T {
+        &self.term
+    }
+
+    pub(crate) fn op(&self) -> &PredicateOperator {
+        &self.op
+    }
 }
 
 /// Binary predicate, for example, `a > 10`.
@@ -144,6 +152,18 @@ impl<T> BinaryExpression<T> {
         debug_assert!(op.is_binary());
         Self { op, term, literal }
     }
+
+    pub(crate) fn term(&self) -> &T {
+        &self.term
+    }
+
+    pub(crate) fn op(&self) -> &PredicateOperator {
+        &self.op
+    }
+
+    pub(crate) fn literal(&self) -> &Datum {
+        &self.literal
+    }
 }
 
 impl<T: Display> Display for BinaryExpression<T> {
@@ -191,6 +211,18 @@ impl<T> SetExpression<T> {
         debug_assert!(op.is_set());
         Self { op, term, literals }
     }
+
+    pub(crate) fn term(&self) -> &T {
+        &self.term
+    }
+
+    pub(crate) fn op(&self) -> &PredicateOperator {
+        &self.op
+    }
+
+    pub(crate) fn literals(&self) -> &FnvHashSet<Datum> {
+        &self.literals
+    }
 }
 
 impl<T: Bind> Bind for SetExpression<T> {