Coalescing outer join panics (and/or loses) columns from right frame if join keys expressions have overlapping names #16289
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accepted
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bug
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python
Related to Python Polars
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Issue description
Looks like coalescing outer join just attempts to eat as many columns from the right dataframe as there are key columns in the join.
Expected behavior
I would expect all three of these (the latter two being odd) mathematically equivalent join expressions to give me the same result.
Or, complain that we're going to produce overlapping output key names.
Installed versions
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