Clojure

Inconsistent hash with java collections

Details

  • Type: Defect Defect
  • Status: Open Open
  • Priority: Major Major
  • Resolution: Unresolved
  • Affects Version/s: Release 1.6
  • Fix Version/s: None
  • Component/s: None
  • Environment:
    1.6.0 master
  • Patch:
    Code and Test
  • Approval:
    Triaged

Description

c.c/hash always use hashCode for java collections, which is incompatible when comparing with Clojure collections, which use Murmur3.

user=> (== (hash (java.util.ArrayList. [1 2 3])) (hash [1 2 3]))
false
user=> (= (java.util.ArrayList. [1 2 3]) [1 2 3])
true

One way to fix it is to add a special case in Util/hasheq for java.util.Collections, as it is now for Strings.

Link to a discussion of this topic in the Clojure group: https://groups.google.com/forum/#!topic/clojure/dQhdwZsyIEw

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Dates

  • Created:
    Updated: