Method of

core/src/main/java/org/apache/calcite/schema/Statistics.java:42–45

Returns a statistic with a given set of referential constraints.

(@Nullable List<RelReferentialConstraint> referentialConstraints)

  /** Returns a statistic with a given set of referential constraints. */
  public static Statistic of(@Nullable List<RelReferentialConstraint> referentialConstraints) {
    return of(null, null,
        referentialConstraints, null);
  }

  /** Returns a statistic with a given row count and set of unique keys. */
  public static Statistic of(final double rowCount,