ayemjay opened a new issue, #17111:
URL: https://github.com/apache/datafusion/issues/17111
### Is your feature request related to a problem or challenge?
Currently, DataFusion’s `date_part('dow', ...)` returns the day of week with
Sunday as 0.
For many use cases, e.g. ISO 8601 compliance, it is desirable to have Monday
as 0 and Sunday as 6.
PostgreSQL already support this via `isodow` in `date_part`.
### Describe the solution you'd like
Add support for `date_part('isodow', ...)` to DataFusion.
This would replicate the existing `dow` implementation but align with the
ISO 8601 definition of day-of-week where Monday is first day of week.
`arrow-rs` already supports `isodow`, so this should primarily involve
wiring up that functionality within DataFusion.
### Describe alternatives you've considered
Computing isodow manually in queries using dow and conditional expressions.
### Additional context
_No response_
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