public void setHistogram(byte[] histogram) {
    // workaround for DN bug in persisting nulls in pg bytea column instead set empty histogram.
    // https://issues.apache.org/jira/browse/HIVE-17836
    this.histogram = (histogram == null ? new byte[] { } : histogram);
  }
MTableColumnStatistics - Represents Hive's Column Statistics Description. The fields in this
class with the exception of table are persisted in the metastore. In case of table, tbl_id is
persisted in its place.
standalone-metastore/metastore-server/src/main/java/org/apache/hadoop/hive/metastore/model/MTableColumnStatistics.java