nishantmonu51 commented on a change in pull request #5958: Part 2 of changes
for SQL Compatible Null Handling
URL: https://github.com/apache/incubator-druid/pull/5958#discussion_r201371259
##########
File path:
extensions-core/histogram/src/main/java/io/druid/query/aggregation/histogram/ApproximateHistogramAggregator.java
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@@ -59,7 +60,9 @@ public ApproximateHistogramAggregator(
@Override
public void aggregate()
{
- histogram.offer(selector.getFloat());
+ if (NullHandling.replaceWithDefault() || !selector.isNull()) {
Review comment:
this means whether nulls should be replaced with default value.
In case of ExpressionColumnValueSelector isNull will compute the expression
and then give the result, the check is there to not have any performance impact
of calling isNull for default case.
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