killme2008 opened a new issue, #17617:
URL: https://github.com/apache/datafusion/issues/17617
### Describe the bug
For example:
```sql
SELECT APPROX_DISTINCT(NULL);
SELECT APPROX_DISTINCT('2025-09-17'::DATE);
SELECT APPROX_DISTINCT('2025-09-17 16:36:00'::TIMESTAMP);
```
All of these queries fail with:
```
This feature is not implemented: Support for 'approx_distinct' for data type
xxx is not implemented
```
However, they should be supported for the sake of functional completeness.
### To Reproduce
_No response_
### Expected behavior
_No response_
### Additional context
_No response_
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