public int findInMap(ColumnVector indexColumnVector, int indexBatchIndex,
      MapColumnVector mapColumnVector, int mapBatchIndex) {
    throw new RuntimeException("Not implemented");
  }
Superclass to support vectorized functions that take a column value as key of Map
and return the value of Map.
ql/src/java/org/apache/hadoop/hive/ql/exec/vector/expressions/VectorUDFMapIndexBaseCol.java