Jackie-Jiang commented on a change in pull request #5476:
URL: https://github.com/apache/incubator-pinot/pull/5476#discussion_r437753947
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File path:
pinot-core/src/main/java/org/apache/pinot/core/startree/v2/builder/BaseSingleTreeBuilder.java
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@@ -150,7 +151,11 @@
// Ignore the column for COUNT aggregation function
if (_valueAggregators[index].getAggregationType() !=
AggregationFunctionType.COUNT) {
String column = functionColumnPair.getColumn();
- _metricDataTypes[index] = schema.getFieldSpecFor(column).getDataType();
+ FieldSpec fieldSpec = schema.getFieldSpecFor(column);
+ if (fieldSpec == null) {
Review comment:
I would suggest using checkState instead:
```suggestion
Preconditions.checkState(fieldSpec != null, "Column: '%s' does not
exist in the schema", column);
```
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