fsk119 commented on code in PR #21945:
URL: https://github.com/apache/flink/pull/21945#discussion_r1111508444


##########
flink-table/flink-sql-gateway/src/main/java/org/apache/flink/table/gateway/rest/serde/LogicalTypeJsonSerializer.java:
##########
@@ -87,6 +89,10 @@ public final class LogicalTypeJsonSerializer extends 
StdSerializer<LogicalType>
     public static final String FIELD_NAME_CLASS = "class";
     public static final String FIELD_NAME_SERIALIZER = "serializer";
 
+    // INTERVAL

Review Comment:
   I just wonder whether it's better to serialize the INTERVAL type as follows:
   
   ```
   {
       "type": "INTERVAL",
       "upperResolution": {
             "precision": ...,
             "intervalUnit": "..."
       },
       "lowerResolution": ...
   }
   ```
   
   So we can align with the API in `DataTypes#INTERVAL`. WDYT? @twalthr 
@lincoln-lil 



##########
flink-table/flink-sql-gateway/src/test/java/org/apache/flink/table/gateway/rest/serde/LogicalTypeJsonSerDeTest.java:
##########
@@ -71,23 +72,32 @@
 
 /** Tests for {@link LogicalType} serialization and deserialization. */
 @Execution(CONCURRENT)
-public class LogicalTypeJsonSerDeTest {
+class LogicalTypeJsonSerDeTest {
 
     private final ObjectMapper mapper = buildObjectMapper();
 
     @ParameterizedTest
     @MethodSource("generateTestData")

Review Comment:
   Please also add a test about the serialization/deserialization of the type.



##########
flink-table/flink-sql-gateway/src/test/java/org/apache/flink/table/gateway/rest/serde/ResultInfoJsonSerDeTest.java:
##########
@@ -123,7 +131,7 @@ public void testResultInfoSerDeWithNullValues(RowFormat 
rowFormat) throws Except
 
     @ParameterizedTest
     @ValueSource(strings = {"result_info_json_format.txt", 
"result_info_plain_text_format.txt"})

Review Comment:
   Could you also modify the JSON in the text to make sure others will not 
break the serialization results in the future?



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