Jefffrey opened a new pull request, #18877:
URL: https://github.com/apache/datafusion/pull/18877
## Which issue does this PR close?
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## Rationale for this change
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Whilst reviewing some recent PRs (#18839 & #18768) I noticed we have quite a
few inner implementation functions that are public for some reason, which give
the false impression these are meant to be public APIs (and thus any changes to
their signature needs to be restricted). Went through and limited the functions
to private where possible to try reduce our public API footprint.
## What changes are included in this PR?
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Change inner functions in functions & nested-functions crates to be private,
away from public.
- There are still some that are left public such as some regex ones, because
they are used directly in benches
## Are these changes tested?
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Compiler itself.
## Are there any user-facing changes?
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Yes, quite a few functions are now private, but I don't think they were
meant to be public in the first place.
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