alpaylan opened a new issue, #2763:
URL: https://github.com/apache/datafusion-sqlparser-rs/issues/2763
With PostgreSqlDialect (and GenericDialect), a precision written after
`INTERVAL` is parsed and then dropped:
```
SELECT INTERVAL (3) '1.23456 seconds' -- PostgreSqlDialect
-> displays as: SELECT INTERVAL '1.23456 seconds'
-> AST: Interval { value: '1.23456 seconds', leading_precision: None,
fractional_seconds_precision: None, .. }
SELECT INTERVAL (100) MINUTE -- GenericDialect
-> displays as: SELECT INTERVAL MINUTE (the 100 is gone and MINUTE
becomes the value)
```
The precision changes the result in PostgreSQL (18.6):
```
SELECT INTERVAL (3) '1.23456 seconds', INTERVAL '1.23456 seconds';
-- 00:00:01.235 | 00:00:01.23456
```
The Generic case worked in 0.58.0 (`INTERVAL (100) MINUTE` round-tripped, as
it still does with MySqlDialect) and changed with #1984.
Tested on main c45d1f4e (also 0.63.0).
Found with a property-based fuzzer (round trip and statement-separation
checks); I used AI assistance for triage and verified every case above.
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