revert useless change

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

Author: xinyual

core/src/main/java/org/opensearch/sql/expression/function/PPLTypeChecker.java

@@ -398,9 +398,7 @@ private static List<ExprType> getExprTypes(SqlTypeFamily family) {
             // Integer is mapped to BIGINT in family.getDefaultConcreteType
           case INTEGER -> List.of(
               OpenSearchTypeFactory.TYPE_FACTORY.createSqlType(SqlTypeName.INTEGER));
-            // case DATETIME_INTERVAL ->
-            // SqlTypeName.INTERVAL_TYPES.stream().map(OpenSearchTypeFactory.TYPE_FACTORY::createSqlIntervalType).toList();
-          case ANY, IGNORE, DATETIME_INTERVAL -> List.of(
+          case ANY, IGNORE -> List.of(
               OpenSearchTypeFactory.TYPE_FACTORY.createSqlType(SqlTypeName.ANY));
           default -> {
             RelDataType type = family.getDefaultConcreteType(OpenSearchTypeFactory.TYPE_FACTORY);