@Override
  public boolean equals(Object o) {
    if (this == o) return true;
    if (o == null || getClass() != o.getClass()) return false;

    PropertyMap that = (PropertyMap) o;

    if (!Objects.equals(getDigest(), that.getDigest())) return false;
    return Objects.equals(schema, that.schema);
  }
A copy of this map.
<p>Called to avoid sharing instances from cache.</p>

@return a shallow copy of this map
standalone-metastore/metastore-common/src/main/java/org/apache/hadoop/hive/metastore/properties/PropertyMap.java