comphead commented on code in PR #13497:
URL: https://github.com/apache/datafusion/pull/13497#discussion_r1852964862
##########
datafusion/physical-expr/src/equivalence/properties.rs:
##########
@@ -1014,6 +1016,37 @@ impl EquivalenceProperties {
is_constant_recurse(&normalized_constants, &normalized_expr)
}
+ /// This function determines whether the provided expression is constant
+ /// across partitions based on the known constants.
+ ///
+ /// # Arguments
+ ///
+ /// - `expr`: A reference to a `Arc<dyn PhysicalExpr>` representing the
+ /// expression to be checked.
+ ///
+ /// # Returns
+ ///
+ /// Returns `true` if the expression is constant across all partitions
according
+ /// to equivalence group, `false` otherwise.
+ pub fn is_expr_constant_accross_partitions(
+ &self,
+ expr: &Arc<dyn PhysicalExpr>,
+ ) -> bool {
+ // As an example, assume that we know columns `a` and `b` are constant.
Review Comment:
love this doc!
so the result is `true` if expression contains only constants?
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