siddharthteotia commented on a change in pull request #4535: Implement DISTINCT 
clause
URL: https://github.com/apache/incubator-pinot/pull/4535#discussion_r319207976
 
 

 ##########
 File path: 
pinot-core/src/main/java/org/apache/pinot/core/query/aggregation/AggregationFunctionContext.java
 ##########
 @@ -54,4 +61,20 @@ public String getColumn() {
   public String getAggregationColumnName() {
     return _aggregationFunction.getColumnName(_column);
   }
+
+  public void setProjectedColumnTypes(final FieldSpec.DataType[] 
projectedColumnTypes) {
 
 Review comment:
   The information is needed in function contexts to build a proper data table 
with correct column data types in schema. This is used by 
InstanceResponseOperator

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