Examples with SingleMergeExchangePrel org.apache.drill.exec.planner.physical.SingleMergeExchangePrel used on opensource projects

Example 1 with SingleMergeExchangePrel

use of org.apache.drill.exec.planner.physical.SingleMergeExchangePrel in project drill by apache.

the class ExcessiveExchangeIdentifier method visitExchange.

@Override
public Prel visitExchange(ExchangePrel prel, MajorFragmentStat parent) throws RuntimeException {
    parent.add(prel);
    MajorFragmentStat newFrag = new MajorFragmentStat();
    newFrag.setRightSideOfLateral(parent.isRightSideOfLateral());
    if (prel instanceof SingleMergeExchangePrel) {
        newFrag.isSimpleRel = true;
    }
    Prel newChild = ((Prel) prel.getInput()).accept(this, newFrag);
    if (parent.isSimpleRel && prel instanceof HashToMergeExchangePrel) {
        return newChild;
    }
    if (canRemoveExchange(parent, newFrag)) {
        return newChild;
    } else if (newChild != prel.getInput()) {
        return (Prel) prel.copy(prel.getTraitSet(), Collections.singletonList(newChild));
    } else {
        return prel;
    }
}