gaogaotiantian opened a new pull request, #54463:
URL: https://github.com/apache/spark/pull/54463
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### What changes were proposed in this pull request?
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* Modified `check_dependencies` so it does not need `__name__` to check
whether this is a doctest call. Now it checks whether `sys.modules['__main__']`
is initialized to determine if we are running a doctest. If we are running a
module under `pyspark.sql.connect` or `pyspark.ml.connect` directly, this
function will be executed before the module is initialized. Otherwise the
`__main__` module should have a `__spec__` or `__file__` associated to it.
* Removed all the `check_dependencies` usages in different files and moved
it to `__init__` file of `pyspark.sql.connect` ad `pyspark.ml.connect`
### Why are the changes needed?
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There are some downsides to have `check_dependencies` scattered in different
files
* People don't really know what's it about. Some files have it and some
don't.
* It's against PEP 8 where all the imports should happen before any
executable code. We may have some exceptions but we should not do it in too
many files.
* When we add a new file in the future, people might forget to do this (or
they don't know if they should do it)
With this change, people can still get a decent error message when they
don't have the dependencies while they are using connect. doctests are skipped
properly.
### Does this PR introduce _any_ user-facing change?
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No.
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Did some manual test but still need to check CI.
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Only the removing part by Cursor (claude-4.6-opus-high)
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