walterddr commented on a change in pull request #8324: [FLINK-11921][table] 
Upgrade to calcite 1.19
URL: https://github.com/apache/flink/pull/8324#discussion_r284344713
 
 

 ##########
 File path: 
flink-table/flink-table-planner/src/main/java/org/apache/calcite/avatica/util/DateTimeUtils.java
 ##########
 @@ -1039,6 +1141,46 @@ public String getFraction() {
                        return fraction;
                }
        }
+
+       /** Deals with values of {@code java.time.OffsetDateTime} without 
introducing
+        * a compile-time dependency (because {@code OffsetDateTime} is only 
JDK 8 and
+        * higher). */
+       private interface OffsetDateTimeHandler {
+               boolean isOffsetDateTime(Object o);
+               String stringValue(Object o);
 
 Review comment:
   this is copied from avactica 1.14.0 release

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