@HiveDecimalVersionV2
  public int newFasterHashCode() {
    return fastNewFasterHashCode();
  }
Hash code based on (new) decimal representation.
<p>
Faster than hashCode().
<p>
Used by map join and other Hive internal purposes where performance is important.
<p>
IMPORTANT: See comments for hashCode(), too.
storage-api/src/java/org/apache/hadoop/hive/common/type/HiveDecimal.java