alamb opened a new issue, #15881:
URL: https://github.com/apache/datafusion/issues/15881
### Describe the bug
When invalid arguments are passed to `generate_series` it generates internal
errors rather than normal execution errorrs
Also the errors are not clear how to fix the issue
### To Reproduce
```
> select generate_series(1, '2024-01-01', '2025-01-02');
Internal error: could not cast array of type Date32 to
arrow_array::array::primitive_array::PrimitiveArray<arrow_array::types::Int64Type>.
This was likely caused by a bug in DataFusion's code and we would welcome
that you file an bug report in our issue tracker
```
Here is a similar one:
```
> select unnest(generate_series('2024-01-01'::timestamp, '2025-01-02',
interval '1 day'));
Internal error: Unexpected argument type for GENERATE_SERIES : Date32.
```
### Expected behavior
I think this should just be a normal error (not an internal error)
According to the docs,
https://datafusion.apache.org/user-guide/sql/scalar_functions.html#generate-series
the first and second argument must be the same
> Arguments
> start: Start of the series. Ints, timestamps, dates or string types that
can be coerced to Date32 are supported.
> end: End of the series (included). Type must be the same as start.
> step: Increase by step (can not be 0). Steps less than a day are supported
only for timestamp ranges.
### Additional context
_No response_
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