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jorisvandenbossche avatar jorisvandenbossche commented on September 26, 2024

Supporting a left join
... when doing a left join, geopandas.sjoin preserves the rows of the left dataframe that don't match with a geometry of the right dataframe. But so if we do this multiple times, it means that rows of the left dataframe can end up in multiple output partitions

One way to "relatively easy" do this, is to always do at least one "left join" for each partition of the left dataframe, and then inner joins for any additional sjoin calls for that same partition. (unfortunately, this would still give potentially duplicated rows)

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alxmrs avatar alxmrs commented on September 26, 2024

Hello! What's the priority on this feature request? I'm interested in performing left joins (a left outer join) with this library.

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martinfleis avatar martinfleis commented on September 26, 2024

@alxmrs we don't really have a capacity to work on dask-geopandas beyond maintenance these days. I'd be happy to review a PR if someone wants to give it a go but it is unlikely that any of us will try to implement left joins anytime soon.

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alxmrs avatar alxmrs commented on September 26, 2024

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martinfleis avatar martinfleis commented on September 26, 2024

Sure, if you have anything to discuss leave it in this issue.

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