Dandandan commented on issue #20078:
URL: https://github.com/apache/datafusion/issues/20078#issuecomment-3834595486

   * `Arc::clone` might only show up with heavy contention (e.g. with 128 
threads poking at the expressions? instead of 1)
   * Hm we should probably be able to avoid the O(n2) *and* support those, but 
let's see!


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