[jira] [Created] (ARROW-12319) [Rust][DataFusion] Improve the errors that result when a aggregate type is not supported

["Andrew Lamb (Jira)" <ji...@apache.org>]

Andrew Lamb created ARROW-12319:
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             Summary: [Rust][DataFusion] Improve the errors that result when a aggregate type is not supported
                 Key: ARROW-12319
                 URL: https://issues.apache.org/jira/browse/ARROW-12319
             Project: Apache Arrow
          Issue Type: Improvement
          Components: Rust - DataFusion
            Reporter: Andrew Lamb



When you try and run a query such as

{code}
select AVG(ts_colum) from t;
{code}

where ts_column has `DataType::Timestamp` type, you get a pretty unintelligible error message

"Coercion from [Timestamp(Nanosecond, None)] to the signature Uniform(1, [Int8, Int16, Int32, Int64, UInt8, UInt16, UInt32, UInt64, Float32, Float64]) failed."

This error should be improved to say something more like AVG is not supported for {datatype} try an explicit cast.




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