wirybeaver commented on code in PR #12238:
URL: https://github.com/apache/pinot/pull/12238#discussion_r1460134339


##########
pinot-spi/src/main/java/org/apache/pinot/spi/utils/JsonUtils.java:
##########
@@ -719,4 +719,18 @@ private static void addFieldToPinotSchema(Schema 
pinotSchema, DataType dataType,
       }
     }
   }
+
+  public static List<Map<String, String>> flatten(String jsonString, 
JsonIndexConfig jsonIndexConfig) throws IOException {
+    JsonNode jsonNode;
+    try {
+      jsonNode = JsonUtils.stringToJsonNode(jsonString);
+    } catch (IOException e) {

Review Comment:
   @ankitsultana @walterddr 
   I change the source catch JsonProcessingException because the 
stringToJsonNode internal invoke the DEFAULT_READER.readTree() which throws 
JsonProcessingException only.
   
   ```
   JsonUtils.stringToJsonNode(...) throws IOException {
           DEFAULT_READER.readTree(...);
   }
   
   class ObjectReader {
         public JsonNode readTree(String json) throws JsonProcessingException, 
JsonMappingException;
   }
   ```
   JsonMappingException is a child of JsonProcessingException.



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