Examples with UnionResultIterators org.apache.phoenix.iterate.UnionResultIterators used on opensource projects

Example 1 with UnionResultIterators

use of org.apache.phoenix.iterate.UnionResultIterators in project phoenix by apache.

the class UnionPlan method iterator.

@Override
public final ResultIterator iterator(ParallelScanGrouper scanGrouper, Scan scan) throws SQLException {
    this.iterators = new UnionResultIterators(plans, parentContext);
    ResultIterator scanner;
    boolean isOrdered = !orderBy.getOrderByExpressions().isEmpty();
    if (isOrdered) {
        // TopN
        scanner = new MergeSortTopNResultIterator(iterators, limit, offset, orderBy.getOrderByExpressions());
    } else {
        scanner = new ConcatResultIterator(iterators);
        if (offset != null) {
            scanner = new OffsetResultIterator(scanner, offset);
        }
        if (limit != null) {
            scanner = new LimitingResultIterator(scanner, limit);
        }
    }
    return scanner;
}