fix: parsing timestamp with date format (#10476)

* fix parsing timestamp with date format

* add test in dates.slt

Author: shanretoo

datafusion/functions/src/datetime/common.rs

@@ -93,7 +93,9 @@ pub(crate) fn string_to_datetime_formatted<T: TimeZone>(
 
     if let Err(e) = &dt {
         // no timezone or other failure, try without a timezone
-        let ndt = parsed.to_naive_datetime_with_offset(0);
+        let ndt = parsed
+            .to_naive_datetime_with_offset(0)
+            .or_else(|_| parsed.to_naive_date().map(|nd| nd.into()));
         if let Err(e) = &ndt {
             return Err(err(&e.to_string()));
         }

datafusion/functions/src/datetime/to_timestamp.rs

@@ -670,6 +670,10 @@ mod tests {
             parse_timestamp_formatted("09-08-2020 13/42/29", "%m-%d-%Y %H/%M/%S")
                 .unwrap()
         );
+        assert_eq!(
+            1642896000000000000,
+            parse_timestamp_formatted("2022-01-23", "%Y-%m-%d").unwrap()
+        );
     }
 
     fn parse_timestamp_formatted(s: &str, format: &str) -> Result<i64, DataFusionError> {

datafusion/sqllogictest/test_files/dates.slt

@@ -224,5 +224,11 @@ SELECT to_date(t.ts, '%Y-%m-%d %H/%M/%S%#z', '%s', '%q', '%d-%m-%Y %H:%M:%S%#z',
 query error function unsupported data type at index 1:
 SELECT to_date(t.ts, make_array('%Y-%m-%d %H/%M/%S%#z', '%s', '%q', '%d-%m-%Y %H:%M:%S%#z', '%+')) from ts_utf8_data as t
 
+# verify to_date with format
+query D
+select to_date('2022-01-23', '%Y-%m-%d');
+----
+2022-01-23
+
 statement ok
 drop table ts_utf8_data