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Posted to github@arrow.apache.org by GitBox <gi...@apache.org> on 2022/11/15 00:17:19 UTC

[GitHub] [arrow-rs] andygrove opened a new issue, #3114: Improve schema merging

andygrove opened a new issue, #3114:
URL: https://github.com/apache/arrow-rs/issues/3114

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   I am trying to work with the nyctaxi parquet data set which has one file per month. Over time, some of the types have changed. For example `passenger_count` started out as `Int64` and was later changed to `Float64`. 
   
   Arrow-rs can not merge these schemas.
   
   Other solutions (such as DuckDB) will merge these schemas and pick the wider type (`Float64`).
   
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[GitHub] [arrow-rs] andygrove commented on issue #3114: Improve schema merging

Posted by GitBox <gi...@apache.org>.
andygrove commented on issue #3114:
URL: https://github.com/apache/arrow-rs/issues/3114#issuecomment-1315479341

   I'm fine with implementing this in DataFusion. It currently delegates to `Schema::try_merge` in this repo, though, so it would likely mean duplicating some of this code in DF. I'll transfer this issue.


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[GitHub] [arrow-rs] tustvold commented on issue #3114: Improve schema merging

Posted by GitBox <gi...@apache.org>.
tustvold commented on issue #3114:
URL: https://github.com/apache/arrow-rs/issues/3114#issuecomment-1314666050

   I would have thought this logic would exist within the query engine, i.e. DataFusion, not the compute engine?


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