Improve inference for unique with abstract eltypes
#36280
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#20317 improved inference of unique, but problematic cases still arise for containers with known but abstract eltypes. Here, we short-circuit the `typejoin` when the return type is determined by the element type of the input container. For `unique(f, itr)`, this commit also allows the caller to supply `seen::Set` to circumvent the inference challenges.
timholy
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Jun 30, 2020
JuliaLang/julia#36280 introduced the ability to pre-allocate the container used to track values of `f.(itr)` in `unique(f, itr)`. Particularly for containers with `Union` elements, this circumvents significant inference problems. Related: JuliaLang/julia#36454
timholy
added a commit
to JuliaLang/Pkg.jl
that referenced
this pull request
Jun 30, 2020
JuliaLang/julia#36280 introduced the ability to pre-allocate the container used to track values of `f.(itr)` in `unique(f, itr)`. Particularly for containers with `Union` elements, this circumvents significant inference problems. Related: JuliaLang/julia#36454
simeonschaub
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Aug 11, 2020
JuliaLang#20317 improved inference of unique, but problematic cases still arise for containers with known but abstract eltypes. Here, we short-circuit the `typejoin` when the return type is determined by the element type of the input container. For `unique(f, itr)`, this commit also allows the caller to supply `seen::Set` to circumvent the inference challenges.
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#20317 improved inference of
unique, but problematic cases still arise for containers with known but abstract eltypes. Here, we short-circuit thetypejoinwhen the return type is determined by the element type of the input container.For
unique(f, itr), this commit also allows the caller to supplyseen::Setto circumvent the inference challenges.This resolves a number of invalidations in
PkgandREPL.TODO: update NEWS entry with issue number, once assigned.