Examples with RangeIterator org.hsqldb_voltpatches.navigator.RangeIterator used on opensource projects

Example 1 with RangeIterator

use of org.hsqldb_voltpatches.navigator.RangeIterator in project voltdb by VoltDB.

the class StatementDML method executeDeleteStatement.

// fredt - currently deletes that fail due to referential constraints are caught
// prior to actual delete operation
/**
     * Executes a DELETE statement.  It is assumed that the argument is
     * of the correct type.
     *
     * @return the result of executing the statement
     */
Result executeDeleteStatement(Session session) {
    int count = 0;
    RowSetNavigatorLinkedList oldRows = new RowSetNavigatorLinkedList();
    RangeIterator it = RangeVariable.getIterator(session, targetRangeVariables);
    while (it.next()) {
        Row currentRow = it.getCurrentRow();
        oldRows.add(currentRow);
    }
    count = delete(session, baseTable, oldRows);
    if (restartIdentity && targetTable.identitySequence != null) {
        targetTable.identitySequence.reset();
    }
    return Result.getUpdateCountResult(count);
}

Example 2 with RangeIterator

use of org.hsqldb_voltpatches.navigator.RangeIterator 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;
}

Example 3 with RangeIterator

use of org.hsqldb_voltpatches.navigator.RangeIterator in project voltdb by VoltDB.

the class StatementDML method executeMergeStatement.

/**
     * Executes a MERGE statement.  It is assumed that the argument
     * is of the correct type.
     *
     * @return Result object
     */
Result executeMergeStatement(Session session) {
    Result resultOut = null;
    RowSetNavigator generatedNavigator = null;
    PersistentStore store = session.sessionData.getRowStore(baseTable);
    if (generatedIndexes != null) {
        resultOut = Result.newUpdateCountResult(generatedResultMetaData, 0);
        generatedNavigator = resultOut.getChainedResult().getNavigator();
    }
    int count = 0;
    // data generated for non-matching rows
    RowSetNavigatorClient newData = new RowSetNavigatorClient(8);
    // rowset for update operation
    HashMappedList updateRowSet = new HashMappedList();
    RangeVariable[] joinRangeIterators = targetRangeVariables;
    // populate insert and update lists
    RangeIterator[] rangeIterators = new RangeIterator[joinRangeIterators.length];
    for (int i = 0; i < joinRangeIterators.length; i++) {
        rangeIterators[i] = joinRangeIterators[i].getIterator(session);
    }
    for (int currentIndex = 0; 0 <= currentIndex; ) {
        RangeIterator it = rangeIterators[currentIndex];
        boolean beforeFirst = it.isBeforeFirst();
        if (it.next()) {
            if (currentIndex < joinRangeIterators.length - 1) {
                currentIndex++;
                continue;
            }
        } else {
            if (currentIndex == 1 && beforeFirst) {
                Object[] data = getMergeInsertData(session);
                if (data != null) {
                    newData.add(data);
                }
            }
            it.reset();
            currentIndex--;
            continue;
        }
        // row matches!
        if (updateExpressions != null) {
            // this is always the second iterator
            Row row = it.getCurrentRow();
            Object[] data = getUpdatedData(session, baseTable, updateColumnMap, updateExpressions, baseTable.getColumnTypes(), row.getData());
            updateRowSet.add(row, data);
        }
    }
    // update any matched rows
    if (updateRowSet.size() > 0) {
        count = update(session, baseTable, updateRowSet);
    }
    // insert any non-matched rows
    newData.beforeFirst();
    while (newData.hasNext()) {
        Object[] data = newData.getNext();
        baseTable.insertRow(session, store, data);
        if (generatedNavigator != null) {
            Object[] generatedValues = getGeneratedColumns(data);
            generatedNavigator.add(generatedValues);
        }
    }
    baseTable.fireAfterTriggers(session, Trigger.INSERT_AFTER, newData);
    count += newData.getSize();
    if (resultOut == null) {
        return Result.getUpdateCountResult(count);
    } else {
        resultOut.setUpdateCount(count);
        return resultOut;
    }
}