Jackie-Jiang commented on code in PR #16552:
URL: https://github.com/apache/pinot/pull/16552#discussion_r2263810345
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pinot-segment-local/src/main/java/org/apache/pinot/segment/local/aggregator/ValueAggregator.java:
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@@ -42,8 +43,10 @@ public interface ValueAggregator<R, A> {
/**
* Returns the initial aggregated value.
+ * <p>NOTE: rawValue can be null when the aggregator is used for ingestion
aggregation, and the column is not
+ * specified in the schema.
Review Comment:
We get `null` values with/without null handling because the source column is
not specified in the schema, and we don't know what is the default null value
(or data type)
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