public Type[] getReduceSinkValueColumnVectorTypes() {
    return reduceSinkValueColumnVectorTypes;
  }
VectorGroupByAggregationInfo.

A convenience data structure that has information needed to vectorize reduce sink.

It is created by the Vectorizer when it is determining whether it can specialize so the
information doesn't have to be recreated again and against by the VectorReduceSinkOperator's
constructors and later during execution.
ql/src/java/org/apache/hadoop/hive/ql/plan/VectorReduceSinkInfo.java