feat: support java.time.

Author: youngsofun

README.md

@@ -121,9 +121,10 @@ void setObject(int parameterIndex, Object x)
 <T> T getObject(int columnIndex, Class<T> type)
 ```
 
-- TIMESTAMP_TZ and TIMESTAMP map to `OffsetDateTime`, `ZonedDateTime`, `Instant` (TIMESTAMP_TZ can return `OffsetDateTime` but not `ZonedDateTime`), and `LocalDateTime`.
+- TIMESTAMP_TZ and TIMESTAMP map to `OffsetDateTime`, `ZonedDateTime`, `Instant` and `LocalDateTime` (TIMESTAMP_TZ can return `OffsetDateTime` but not `ZonedDateTime`).
 - Date maps to `LocalDate`, and `getObject(..., LocalDate.class)` now mirrors what `getDate().toLocalDate()` returns.
-- When a TIMESTAMP literal omits a timezone, Databend uses the session timezone (not the JVM zone) when storing/returning dates on versions ≥0.4.3 driver + ≥1.2.844 server.
+- When parameters do not contain a timezone, Databend uses the session timezone (not the JVM zone) when storing/returning dates on databend-jdbc ≥ 0.4.3 AND databend-query ≥1.2.844.
+- `getString` return the display of default mapping type.
 
 Timestamp/Date are also supported, note that:
 

databend-jdbc/src/test/java/com/databend/jdbc/TestTypes.java

@@ -159,7 +159,7 @@ public void testSetTimestamp(boolean withTz)
             Timestamp timestamp = Timestamp.from(instant);
             Calendar cal = Calendar.getInstance(TimeZone.getTimeZone("Europe/Moscow"));
 
-            // 1, 2, 3, 4: set use tz in var
+            // 1, 2, 3, 4: same epoch, use tz in parameter,
             ps.setObject(1, offsetDateTime);
             ps.setInt(2, 1);
             ps.execute();
@@ -172,12 +172,11 @@ public void testSetTimestamp(boolean withTz)
             ps.setInt(2, 3);
             ps.execute();
 
-            // cal
             ps.setTimestamp(1, timestamp, cal);
             ps.setInt(2, 4);
             ps.execute();
 
-            // 5, 6:  set use tz=UTC
+            // 5, 6: same epoch, tz=UTC
             ps.setObject(1, instant);
             ps.setInt(2, 5);
             ps.execute();
@@ -186,7 +185,7 @@ public void testSetTimestamp(boolean withTz)
             ps.setInt(2, 6);
             ps.execute();
 
-            // 7: set use session tz
+            // 7: diff epoch, set use session tz
             ps.setString(1, timeStringNoTZ);
             ps.setInt(2, 7);
             ps.execute();
@@ -200,7 +199,7 @@ public void testSetTimestamp(boolean withTz)
                 exp = instant.atOffset(sessionOffset);
             }
 
-            // 1, 2, 3, 4: set use tz in var
+            // 1, 2, 3, 4, 5: same epoch, use tz in parameter,
             r.next();
             Assert.assertEquals(exp, r.getObject(1, OffsetDateTime.class));
             if (!withTz) {