thomasrebele commented on PR #2899:
URL: https://github.com/apache/calcite/pull/2899#issuecomment-1240487900

   Thanks for the PR! What's the advantage of using a `LinkedHashMap` and 
`Equivalence.Identity` compared to a simple `ArrayList` containing the 
`ParameterExpression`s in the order they were added? The latter might consume 
less memory.


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