xudong963 commented on code in PR #15906:
URL: https://github.com/apache/datafusion/pull/15906#discussion_r2068940718
##########
datafusion/optimizer/src/push_down_filter.rs:
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@@ -1382,6 +1386,73 @@ fn contain(e: &Expr, check_map: &HashMap<String, Expr>)
-> bool {
is_contain
}
+/// Infers new predicates by substituting equalities.
+/// For example, with predicates `t2.b = 3` and `t1.b > t2.b`,
+/// we can infer `t1.b > 3`.
+fn infer_predicates_from_equalities(predicates: Vec<Expr>) ->
Result<Vec<Expr>> {
Review Comment:
In the future, we can move the code into a dedicated optimizer rule, such as
`InferPredicates`
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