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Discussed at bug-scrub: general agreement that the AST should not be modified during the evaluation phase.
Perhaps an explicit "optimize" function would want to modify the AST, but that should happen prior to evaluation.
As discussed here #6612 (comment) the PromQL engine currently modifies the structure of the AST being evaluated.
These AST mutations could be prevented with reasonable effort.
Is this something that should be fixed?
@brian-brazil @juliusv
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