Dandandan commented on code in PR #19910:
URL: https://github.com/apache/datafusion/pull/19910#discussion_r2709008542


##########
datafusion/physical-expr-common/src/binary_map.rs:
##########
@@ -389,7 +389,7 @@ where
                 // is value is already present in the set?
                 let entry = self.map.find_mut(hash, |header| {
                     // compare value if hashes match
-                    if header.len != value_len {
+                    if header.hash != hash {

Review Comment:
   Comment says "compare value if hashes match" but actual implementation is 
comparing lengths 🤔 



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