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Posted to github@arrow.apache.org by GitBox <gi...@apache.org> on 2020/08/23 12:15:39 UTC

[GitHub] [arrow] alamb commented on pull request #7967: ARROW-9751: [Rust] [DataFusion] Allow UDFs to accept multiple data types per argument

alamb commented on pull request #7967:
URL: https://github.com/apache/arrow/pull/7967#issuecomment-678766915


    @jorgecarleitao  -- another thing I can think of would be to postpone the UDF resolution until the type coercion logical optimizer pass.
   
   So in other words, when converting `SQL` --> `LogicalPlan`we would postpone populating `data_type` in `ScalarFunction` (or maybe have a `ScalarFunctionPlaceholder` or something) that would not have a data_type. Then we would add something to the type coercion logic that would resolve `ScalarFunctionPlaceholder` to `ScalarFunction`.


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