How to use

unionPreds

method

in

org.apache.calcite.rel.metadata.RelMdUtil

public Double getDistinctRowCount(Filter rel, RelMetadataQuery mq,
  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 mq.getDistinctRowCount(rel.getInput(), groupKey, unionPreds);
}

public Double getDistinctRowCount(Filter rel, RelMetadataQuery mq,
  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 mq.getDistinctRowCount(rel.getInput(), groupKey, unionPreds);
}