Jackie-Jiang commented on code in PR #11661:
URL: https://github.com/apache/pinot/pull/11661#discussion_r1336209773


##########
pinot-core/src/test/java/org/apache/pinot/core/util/SchemaUtilsTest.java:
##########
@@ -161,6 +161,33 @@ public void testCompatibilityWithTableConfig() {
         .addDateTime(TIME_COLUMN, DataType.LONG, "1:MILLISECONDS:EPOCH", 
"1:HOURS")
         .addSingleValueDimension("colA", DataType.STRING).build();
     SchemaUtils.validate(schema, Lists.newArrayList(tableConfig));
+
+    schema = new Schema.SchemaBuilder().setSchemaName(TABLE_NAME)
+            .addMetric("double", DataType.DOUBLE, "NaN").build();

Review Comment:
   (code format) Can you apply [Pinot 
Style](https://docs.pinot.apache.org/developers/developers-and-contributors/code-setup#set-up-ide)
 and reformat the changes?



##########
pinot-segment-local/src/main/java/org/apache/pinot/segment/local/utils/SchemaUtils.java:
##########
@@ -157,6 +161,12 @@ public static void validate(Schema schema, boolean 
isIgnoreCase) {
     }
   }
 
+  private static void validateDefaultIsNotNaN(FieldSpec fieldSpec) {
+    
Preconditions.checkState(!fieldSpec.getDefaultNullValueString().equals("NaN"),
+            "NaN as null default value is not managed yet for %s",
+            fieldSpec);

Review Comment:
   ```suggestion
               fieldSpec.getName());
   ```



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