follow the latest parse logic

Signed-off-by: xinyual <xinyual@amazon.com>

Author: xinyual

opensearch/src/main/java/org/opensearch/sql/opensearch/data/value/OpenSearchExprValueFactory.java

@@ -254,18 +254,9 @@ private static ExprValue parseDateTimeString(String value, OpenSearchDateType da
           return new ExprDateValue(
               DateFormatters.from(STRICT_YEAR_MONTH_DAY_FORMATTER.parse(value)).toLocalDate());
         default:
-          try {
-            return new ExprTimestampValue(
-                    DateFormatters.from(DateFieldMapper.getDefaultDateTimeFormatter().parse(value))
-                            .toInstant());
-          } catch (DateTimeParseException | IllegalArgumentException ignored) {
-            try {
-              return new ExprTimestampValue(
-                      DateFormatters.from(DATE_TIME_FORMATTER.parse(value)).toInstant());
-            } catch (DateTimeParseException | IllegalArgumentException e) {
-              throw e;
-            }
-          }
+          return new ExprTimestampValue(
+                  DateFormatters.from(DateFieldMapper.getDefaultDateTimeFormatter().parse(value))
+                          .toInstant());
       }
     } catch (DateTimeParseException | IllegalArgumentException ignored) {
       // ignored

opensearch/src/test/java/org/opensearch/sql/opensearch/data/value/OpenSearchExprValueFactoryTest.java

@@ -350,18 +350,6 @@ public void constructDatetime() {
             assertEquals(
                 new ExprTimestampValue("1984-05-10 20:30:40"),
                 tupleValue("{ \"dateTimeCustomV\" : 19840510203040 }").get("dateTimeCustomV")),
-        () ->
-            assertEquals(
-                new ExprTimestampValue("2015-01-01 12:10:30"),
-                constructFromObject("timestampV", "2015-01-01 12:10:30")),
-        () ->
-            assertEquals(
-                new ExprDatetimeValue("2015-01-01 12:10:30"),
-                constructFromObject("datetimeV", "2015-01-01 12:10:30")),
-        () ->
-            assertEquals(
-                new ExprDatetimeValue("2015-01-01 12:10:30"),
-                constructFromObject("datetimeDefaultV", "2015-01-01 12:10:30")),
         () ->
             assertEquals(
                 new ExprTimestampValue(Instant.ofEpochMilli(1420070400001L)),
@@ -394,10 +382,6 @@ public void constructDatetime_fromCustomFormat() {
         "Construct TIMESTAMP from \"2015-01-01 12-10-30\" failed, " + "unsupported format.",
         exception.getMessage());
 
-    assertEquals(
-        new ExprDatetimeValue("2015-01-01 12:10:30"),
-        constructFromObject("customAndEpochMillisV", "2015-01-01 12:10:30"));
-
     assertEquals(
         new ExprTimestampValue("2015-01-01 12:10:30"),
         constructFromObject("customAndEpochMillisV", "2015-01-01-12-10-30"));