walterddr commented on code in PR #12238:
URL: https://github.com/apache/pinot/pull/12238#discussion_r1448175846


##########
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) {
+      if (jsonIndexConfig.getSkipInvalidJson()) {
+        return Collections.singletonList(Collections.singletonMap(VALUE_KEY, 
SKIPPED_VALUE_REPLACEMENT));

Review Comment:
   why create this singleton at runtime? can't we make a static obj?



##########
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:
   i think the actual exception here we supposed to cathc is malform json 
exception only. all other issues should still throw --> e..g we should not 
return incorrect result or simply replace that with the default when there are 
other issues. 



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