sgrebnov opened a new pull request, #14407:
URL: https://github.com/apache/datafusion/pull/14407
## Which issue does this PR close?
Unparser dialects specify timestamp data type overrides via
`timestamp_cast_dtype` which is NOT currently used when converting timestamp
literals resulting in `syntax error near TIMESTAMP` error for MySQL
```sql
SELECT CAST('2025-01-31 01:05:49.123' AS TIMESTAMP)
SQL Error [1064] [42000]: You have an error in your SQL syntax; check the
manual that corresponds to your MySQL server version for the right syntax to
use near 'TIMESTAMP))
```
## What changes are included in this PR?
PR updates `handle_timestamp` using in `scalar_to_sql` to respect dialect
timestamp type overrides.
## Are these changes tested?
Yes, manually and added unit test.
## Are there any user-facing changes?
Unparser will generated valid sql for timestamp literals conversion for
dialects specifying custom data type for timestamp conversion
(`timestamp_cast_dtype`)
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