Examples with RangeIteratorMain org.hsqldb_voltpatches.RangeVariable.RangeIteratorMain used on opensource projects

Example 1 with RangeIteratorMain

use of org.hsqldb_voltpatches.RangeVariable.RangeIteratorMain in project voltdb by VoltDB.

the class QuerySpecification method buildResult.

private Result buildResult(Session session, int limitcount) {
    RowSetNavigatorData navigator = new RowSetNavigatorData(session, this);
    Result result = Result.newResult(navigator);
    result.metaData = resultMetaData;
    result.setDataResultConcurrency(isUpdatable);
    // Test for early return case added by VoltDB to support LIMIT 0 in "HSQL backend".
    if (limitcount == 0) {
        return result;
    }
    // End of VoltDB extension
    int fullJoinIndex = 0;
    RangeIterator[] rangeIterators = new RangeIterator[rangeVariables.length];
    for (int i = 0; i < rangeVariables.length; i++) {
        rangeIterators[i] = rangeVariables[i].getIterator(session);
    }
    for (int currentIndex = 0; ; ) {
        if (currentIndex < fullJoinIndex) {
            boolean end = true;
            for (int i = fullJoinIndex + 1; i < rangeVariables.length; i++) {
                if (rangeVariables[i].isRightJoin) {
                    rangeIterators[i] = rangeVariables[i].getFullIterator(session, (RangeIteratorMain) rangeIterators[i]);
                    fullJoinIndex = i;
                    currentIndex = i;
                    end = false;
                    break;
                }
            }
            if (end) {
                break;
            }
        }
        RangeIterator it = rangeIterators[currentIndex];
        if (it.next()) {
            if (currentIndex < rangeVariables.length - 1) {
                currentIndex++;
                continue;
            }
        } else {
            it.reset();
            currentIndex--;
            continue;
        }
        session.sessionData.startRowProcessing();
        Object[] data = new Object[indexLimitData];
        for (int i = 0; i < indexStartAggregates; i++) {
            if (isAggregated && aggregateCheck[i]) {
                continue;
            } else {
                data[i] = exprColumns[i].getValue(session);
            }
        }
        for (int i = indexLimitVisible; i < indexLimitRowId; i++) {
            data[i] = it.getRowidObject();
        }
        Object[] groupData = null;
        if (isAggregated || isGrouped) {
            groupData = navigator.getGroupData(data);
            if (groupData != null) {
                data = groupData;
            }
        }
        for (int i = indexStartAggregates; i < indexLimitExpressions; i++) {
            data[i] = ((ExpressionAggregate) exprColumns[i]).updateAggregatingValue(session, data[i]);
        }
        if (groupData == null) {
            navigator.add(data);
        }
        if (isAggregated || isGrouped) {
            continue;
        }
        if (navigator.getSize() >= limitcount) {
            break;
        }
    }
    navigator.reset();
    if (!isGrouped && !isAggregated) {
        return result;
    }
    if (isAggregated) {
        if (!isGrouped && navigator.getSize() == 0) {
            Object[] data = new Object[exprColumns.length];
            navigator.add(data);
        }
        RangeIteratorBase it = new RangeIteratorBase(session, navigator.store, navigator.table, resultRangePosition);
        session.sessionContext.setRangeIterator(it);
        while (it.next()) {
            for (int i = indexStartAggregates; i < indexLimitExpressions; i++) {
                ExpressionAggregate aggregate = (ExpressionAggregate) exprColumns[i];
                it.currentData[i] = aggregate.getAggregatedValue(session, it.currentData[i]);
            }
            for (int i = 0; i < indexStartAggregates; i++) {
                if (aggregateCheck[i]) {
                    it.currentData[i] = exprColumns[i].getValue(session);
                }
            }
        }
    }
    navigator.reset();
    if (havingCondition != null) {
        while (navigator.hasNext()) {
            Object[] data = navigator.getNext();
            if (!Boolean.TRUE.equals(data[indexLimitVisible + groupByColumnCount])) {
                navigator.remove();
            }
        }
        navigator.reset();
    }
    return result;
}