public Double getDistinctRowCount(Filter rel, ImmutableBitSet groupKey, RexNode predicate) {
if (predicate == null || predicate.isAlwaysTrue()) {
if (groupKey.isEmpty()) {
return 1D;
}
}
// REVIEW zfong 4/18/06 - In the Broadbase code, duplicates are not
// removed from the two filter lists. However, the code below is
// doing so.
RexNode unionPreds =
RelMdUtil.unionPreds(rel.getCluster().getRexBuilder(), predicate, rel.getCondition());
return RelMetadataQuery.getDistinctRowCount(rel.getInput(), groupKey, unionPreds);
}
