This commit is published into the public domain.
### What changes were proposed in this pull request?
In analogy to `python/docs/Makefile`, which has
> export PYTHONPATH=$(realpath ..):$(realpath ../lib/py4j-0.10.8.1-src.zip)
on line 10, this PR adds
> set PYTHONPATH=..;..\lib\py4j-0.10.8.1-src.zip
to `make2.bat`.
Since there is no `realpath` in default installations of Windows, I left the relative paths unresolved. Per the instructions on how to build docs, `make.bat` is supposed to be run from `python/docs` as the working directory, so this should probably not cause issues (`%BUILDDIR%` is a relative path as well.)
### Why are the changes needed?
When building the PySpark documentation on Windows, by changing directory to `python/docs` and running `make.bat` (which runs `make2.bat`), the majority of the documentation may not be built if pyspark is not in the default `%PYTHONPATH%`. Sphinx then reports that `pyspark` (and possibly dependencies) cannot be imported.
If `pyspark` is in the default `%PYTHONPATH%`, I suppose it is that version of `pyspark` – as opposed to the version found above the `python/docs` directory – that is considered when building the documentation, which may result in documentation that does not correspond to the development version one is trying to build.
### Does this PR introduce any user-facing change?
No.
### How was this patch tested?
Manual tests on my Windows 10 machine. Additional tests with other environments very welcome!
Closes#27569 from DavidToneian/SPARK-30823.
Authored-by: David Toneian <david@toneian.com>
Signed-off-by: HyukjinKwon <gurwls223@apache.org>
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