public Double getDistinctRowCount(Join rel, ImmutableBitSet groupKey, RexNode predicate) {
if (predicate == null || predicate.isAlwaysTrue()) {
if (groupKey.isEmpty()) {
return 1D;
}
}
return RelMdUtil.getJoinDistinctRowCount(rel, rel.getJoinType(), groupKey, predicate, false);
}
