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Posted to github@arrow.apache.org by GitBox <gi...@apache.org> on 2022/04/26 04:52:30 UTC

[GitHub] [arrow-datafusion] Ted-Jiang opened a new issue, #2343: Support Multi-Column Producing Function Implementation

Ted-Jiang opened a new issue, #2343:
URL: https://github.com/apache/arrow-datafusion/issues/2343

   I think we will need to introduce a new type of function to cover `inline` since it is not a scalar function.
   
   I don't have a good name for it yet but I think we need something like this?
   
   ``` rust
   pub type MultiColumnProducingFunctionImplementation =
       Arc<dyn Fn(&[ColumnarValue]) -> Result<Vec<ColumnarValue>> + Send + Sync>;
   ```
   
   _Originally posted by @andygrove in https://github.com/apache/arrow-datafusion/issues/2330#issuecomment-1109238122_


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[GitHub] [arrow-datafusion] alamb commented on issue #2343: Support Multi-Column Producing Function Implementation

Posted by GitBox <gi...@apache.org>.
alamb commented on issue #2343:
URL: https://github.com/apache/arrow-datafusion/issues/2343#issuecomment-1110222756

   I think a multiple column table function is different than a "table function"
   
   A table function returns (potentially) multiple columns *and* rows where as I think this ticket is just talking about returning multiple columns.
   
   The natural thing in my mind for this usecase would be to return a single column of `DataType::Struct` (or `DataType::List`)
   
   However DataFusion's support for such compound datatypes is in need of work -- see https://github.com/apache/arrow-datafusion/issues/2326


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[GitHub] [arrow-datafusion] Ted-Jiang commented on issue #2343: Support Multi-Column Producing Function Implementation

Posted by GitBox <gi...@apache.org>.
Ted-Jiang commented on issue #2343:
URL: https://github.com/apache/arrow-datafusion/issues/2343#issuecomment-1109344510

   I thinks we can call it TableFunctionImplementation
   https://docs.snowflake.com/en/sql-reference/functions-table.html


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