@VisibleForTesting
    String getFieldName() {
      return fieldName;
    }
Given a list of partition ids, returns the List of partially filled partitions based on the
projection list used to instantiate this PartitionProjectionEvaluator
@param partitionIds List of partition ids corresponding to the Partitions objects which are requested
@return Partitions where each partition has only the projected fields set
@throws MetaException
standalone-metastore/metastore-server/src/main/java/org/apache/hadoop/hive/metastore/PartitionProjectionEvaluator.java