feat(7849): coerce TIMESTAMP to TIMESTAMPTZ (#7850)

* feat(7849): coerce TIMESTAMP to TIMESTAMPTZ

Add coercion rules to support coercion from timestamp types without
a timezone to a timestamp with a timezone. Like with the coercion
of strings or numeric constants, when a function requires the
TIMEZONE_WILDCARD placeholder timezone "+00" will be used as the
timezone offset.

* review comments

Add additional SQL logic test suggested in review.

* more review suggestions

Add a positive test case for TIMESTAMPTZ and TIMESTAMP comparison.

datafusion/expr/src/type_coercion/functions.rs

@@ -228,7 +228,7 @@ fn coerced_from<'a>(
                 Timestamp(_, Some(from_tz)) => {
                     Some(Timestamp(unit.clone(), Some(from_tz.clone())))
                 }
-                Null | Date32 | Utf8 | LargeUtf8 => {
+                Null | Date32 | Utf8 | LargeUtf8 | Timestamp(_, None) => {
                     // In the absence of any other information assume the time zone is "+00" (UTC).
                     Some(Timestamp(unit.clone(), Some("+00".into())))
                 }
@@ -238,7 +238,7 @@ fn coerced_from<'a>(
         Timestamp(_, Some(_))
             if matches!(
                 type_from,
-                Null | Timestamp(_, Some(_)) | Date32 | Utf8 | LargeUtf8
+                Null | Timestamp(_, _) | Date32 | Utf8 | LargeUtf8
             ) =>
         {
             Some(type_into.clone())

datafusion/sqllogictest/test_files/timestamps.slt

@@ -1389,6 +1389,12 @@ SELECT date_bin('1 day', TIMESTAMPTZ '2022-01-01 20:10:00Z', TIMESTAMPTZ '2020-0
 ----
 2022-01-02T00:00:00+07:00
 
+# coerce TIMESTAMP to TIMESTAMPTZ
+query P
+SELECT date_bin('1 day', TIMESTAMPTZ '2022-01-01 20:10:00Z', TIMESTAMP '2020-01-01')
+----
+2022-01-01T07:00:00+07:00
+
 # postgresql: 1
 query R
 SELECT date_part('hour', TIMESTAMPTZ '2000-01-01T01:01:01') as part
@@ -1758,3 +1764,15 @@ query T
 SELECT arrow_typeof(date_bin(INTERVAL '1 day', time, '1970-01-01T00:00:00+05:00')) FROM foo LIMIT 1
 ----
 Timestamp(Nanosecond, Some("+05:00"))
+
+
+# timestamp comparison with and without timezone
+query B
+SELECT TIMESTAMPTZ '2022-01-01 20:10:00Z' = TIMESTAMP '2020-01-01'
+----
+false
+
+query B
+SELECT TIMESTAMPTZ '2020-01-01 00:00:00Z' = TIMESTAMP '2020-01-01'
+----
+true