How to use

getJoinRowCount

method

in

org.apache.calcite.rel.metadata.RelMdUtil

public Double getRowCount(Join rel, RelMetadataQuery mq) {
 return RelMdUtil.getJoinRowCount(mq, rel, rel.getCondition());
}

@Override public double estimateRowCount(RelMetadataQuery mq) {
 return Util.first(RelMdUtil.getJoinRowCount(mq, this, condition), 1D);
}

@Override public double estimateRowCount(RelMetadataQuery mq) {
 return Util.first(RelMdUtil.getJoinRowCount(mq, this, condition), 1D);
}

public Double getRowCount(Join rel, RelMetadataQuery mq) {
 return RelMdUtil.getJoinRowCount(mq, rel, rel.getCondition());
}

/** @deprecated Use {@link RelMdUtil#getJoinRowCount(RelMetadataQuery, Join, RexNode)}. */
@Deprecated // to be removed before 2.0
public static double estimateJoinedRows(
  Join joinRel,
  RexNode condition) {
 final RelMetadataQuery mq = RelMetadataQuery.instance();
 return Util.first(RelMdUtil.getJoinRowCount(mq, joinRel, condition), 1D);
}

/** @deprecated Use {@link RelMdUtil#getJoinRowCount(RelMetadataQuery, Join, RexNode)}. */
@Deprecated // to be removed before 2.0
public static double estimateJoinedRows(
  Join joinRel,
  RexNode condition) {
 final RelMetadataQuery mq = RelMetadataQuery.instance();
 return Util.first(RelMdUtil.getJoinRowCount(mq, joinRel, condition), 1D);
}

/**
 * Copied for {@link RelMdRowCount#getRowCount(Join, RelMetadataQuery)}. We will be removing this
 * function usage in Dremio code in future: TODO: DX-12150
 *
 * @param mq
 * @return
 */
@Override
public double estimateRowCount(RelMetadataQuery mq) {
 if (getCondition().isAlwaysTrue()) {
  return RelMdUtil.getJoinRowCount(mq, this, getCondition());
 }
 return Math.max(mq.getRowCount(getLeft()), mq.getRowCount(getRight()));
}