Fix bug in `local_reduce_join` rewrite. #3317

Job	Run time
Make SDist	20s
Build & inspect our package.	30s
Build wheels for macos-12	2m 55s
Build wheels for windows-2022	3m 44s
Build wheels for ubuntu-20.04	20m 30s
Build universal wheel for Pyodide	19s
Check dist	35s
Upload to PyPI on release	0s
	28m 53s

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