private void queryQuick(int columnCount, ResultTarget result) {
Value[] row = new Value[columnCount];
for (int i = 0; i < columnCount; i++) {
Expression expr = expressions.get(i);
row[i] = expr.getValue(session);
}
result.addRow(row);
}
private void queryFlat(int columnCount, ResultTarget result, long limitRows) {
// limitRows must be long, otherwise we get an int overflow
// if limitRows is at or near Integer.MAX_VALUE
// limitRows is never 0 here
if (limitRows > 0 && offsetExpr != null) {
int offset = offsetExpr.getValue(session).getInt();
if (offset > 0) {
limitRows += offset;
}
}
int rowNumber = 0;
setCurrentRowNumber(0);
ArrayList<Row> forUpdateRows = null;
if (isForUpdateMvcc) {
forUpdateRows = New.arrayList();
}
while (topTableFilter.next()) {
setCurrentRowNumber(rowNumber + 1);
if (condition == null || Boolean.TRUE.equals(condition.getBooleanValue(session))) {
Value[] row = new Value[columnCount];
for (int i = 0; i < columnCount; i++) {
Expression expr = expressions.get(i);
row[i] = expr.getValue(session);
}
if (isForUpdateMvcc) {
topTableFilter.lockRowAdd(forUpdateRows);
}
result.addRow(row);
rowNumber++;
if ((sort == null || sortUsingIndex)
&& limitRows > 0
&& result.getRowCount() >= limitRows) {
break;
}
if (sampleSize > 0 && rowNumber >= sampleSize) {
break;
}
}
}
if (isForUpdateMvcc) {
topTableFilter.lockRows(forUpdateRows);
}
}
private void addGroupSortedRow(Value[] keyValues, int columnCount, ResultTarget result) {
Value[] row = new Value[columnCount];
for (int j = 0; groupIndex != null && j < groupIndex.length; j++) {
row[groupIndex[j]] = keyValues[j];
}
for (int j = 0; j < columnCount; j++) {
if (groupByExpression != null && groupByExpression[j]) {
continue;
}
Expression expr = expressions.get(j);
row[j] = expr.getValue(session);
}
if (isHavingNullOrFalse(row)) {
return;
}
row = keepOnlyDistinct(row, columnCount);
result.addRow(row);
}
private void queryDistinct(ResultTarget result, long limitRows) {
// limitRows must be long, otherwise we get an int overflow
// if limitRows is at or near Integer.MAX_VALUE
// limitRows is never 0 here
if (limitRows > 0 && offsetExpr != null) {
int offset = offsetExpr.getValue(session).getInt();
if (offset > 0) {
limitRows += offset;
}
}
int rowNumber = 0;
setCurrentRowNumber(0);
Index index = topTableFilter.getIndex();
SearchRow first = null;
int columnIndex = index.getColumns()[0].getColumnId();
while (true) {
setCurrentRowNumber(rowNumber + 1);
Cursor cursor = index.findNext(session, first, null);
if (!cursor.next()) {
break;
}
SearchRow found = cursor.getSearchRow();
Value value = found.getValue(columnIndex);
if (first == null) {
first = topTableFilter.getTable().getTemplateSimpleRow(true);
}
first.setValue(columnIndex, value);
Value[] row = {value};
result.addRow(row);
rowNumber++;
if ((sort == null || sortUsingIndex) && limitRows > 0 && rowNumber >= limitRows) {
break;
}
if (sampleSize > 0 && rowNumber >= sampleSize) {
break;
}
}
}
protected LocalResult queryWithoutCache(int maxRows, ResultTarget target) {
int limitRows = maxRows == 0 ? -1 : maxRows;
if (limitExpr != null) {
Value v = limitExpr.getValue(session);
int l = v == ValueNull.INSTANCE ? -1 : v.getInt();
if (limitRows < 0) {
limitRows = l;
} else if (l >= 0) {
limitRows = Math.min(l, limitRows);
}
}
int columnCount = expressions.size();
LocalResult result = null;
if (target == null || !session.getDatabase().getSettings().optimizeInsertFromSelect) {
result = createLocalResult(result);
}
if (sort != null && (!sortUsingIndex || distinct)) {
result = createLocalResult(result);
result.setSortOrder(sort);
}
if (distinct && !isDistinctQuery) {
result = createLocalResult(result);
result.setDistinct();
}
if (randomAccessResult) {
result = createLocalResult(result);
result.setRandomAccess();
}
if (isGroupQuery && !isGroupSortedQuery) {
result = createLocalResult(result);
}
if (limitRows >= 0 || offsetExpr != null) {
result = createLocalResult(result);
}
topTableFilter.startQuery(session);
topTableFilter.reset();
boolean exclusive = isForUpdate && !isForUpdateMvcc;
if (isForUpdateMvcc) {
if (isGroupQuery) {
throw DbException.getUnsupportedException("FOR UPDATE && GROUP");
} else if (distinct) {
throw DbException.getUnsupportedException("FOR UPDATE && DISTINCT");
} else if (isQuickAggregateQuery) {
throw DbException.getUnsupportedException("FOR UPDATE && AGGREGATE");
} else if (topTableFilter.getJoin() != null) {
throw DbException.getUnsupportedException("FOR UPDATE && JOIN");
} else if (topTableFilter.getJoin() != null) {
throw DbException.getUnsupportedException("FOR UPDATE && JOIN");
}
}
topTableFilter.lock(session, exclusive, exclusive);
ResultTarget to = result != null ? result : target;
if (limitRows != 0) {
if (isQuickAggregateQuery) {
queryQuick(columnCount, to);
} else if (isGroupQuery) {
if (isGroupSortedQuery) {
queryGroupSorted(columnCount, to);
} else {
queryGroup(columnCount, result);
}
} else if (isDistinctQuery) {
queryDistinct(to, limitRows);
} else {
queryFlat(columnCount, to, limitRows);
}
}
if (offsetExpr != null) {
result.setOffset(offsetExpr.getValue(session).getInt());
}
if (limitRows >= 0) {
result.setLimit(limitRows);
}
if (result != null) {
result.done();
if (target != null) {
while (result.next()) {
target.addRow(result.currentRow());
}
result.close();
return null;
}
return result;
}
return null;
}
@Override
protected LocalResult queryWithoutCache(int maxRows, ResultTarget target) {
if (maxRows != 0) {
// maxRows is set (maxRows 0 means no limit)
int l;
if (limitExpr == null) {
l = -1;
} else {
Value v = limitExpr.getValue(session);
l = v == ValueNull.INSTANCE ? -1 : v.getInt();
}
if (l < 0) {
// for limitExpr, 0 means no rows, and -1 means no limit
l = maxRows;
} else {
l = Math.min(l, maxRows);
}
limitExpr = ValueExpression.get(ValueInt.get(l));
}
if (session.getDatabase().getSettings().optimizeInsertFromSelect) {
if (unionType == UNION_ALL && target != null) {
if (sort == null && !distinct && maxRows == 0 && offsetExpr == null && limitExpr == null) {
left.query(0, target);
right.query(0, target);
return null;
}
}
}
int columnCount = left.getColumnCount();
LocalResult result = new LocalResult(session, expressionArray, columnCount);
if (sort != null) {
result.setSortOrder(sort);
}
if (distinct) {
left.setDistinct(true);
right.setDistinct(true);
result.setDistinct();
}
if (randomAccessResult) {
result.setRandomAccess();
}
switch (unionType) {
case UNION:
case EXCEPT:
left.setDistinct(true);
right.setDistinct(true);
result.setDistinct();
break;
case UNION_ALL:
break;
case INTERSECT:
left.setDistinct(true);
right.setDistinct(true);
break;
default:
DbException.throwInternalError("type=" + unionType);
}
ResultInterface l = left.query(0);
ResultInterface r = right.query(0);
l.reset();
r.reset();
switch (unionType) {
case UNION_ALL:
case UNION:
{
while (l.next()) {
result.addRow(convert(l.currentRow(), columnCount));
}
while (r.next()) {
result.addRow(convert(r.currentRow(), columnCount));
}
break;
}
case EXCEPT:
{
while (l.next()) {
result.addRow(convert(l.currentRow(), columnCount));
}
while (r.next()) {
result.removeDistinct(convert(r.currentRow(), columnCount));
}
break;
}
case INTERSECT:
{
LocalResult temp = new LocalResult(session, expressionArray, columnCount);
temp.setDistinct();
temp.setRandomAccess();
while (l.next()) {
temp.addRow(convert(l.currentRow(), columnCount));
}
while (r.next()) {
Value[] values = convert(r.currentRow(), columnCount);
if (temp.containsDistinct(values)) {
result.addRow(values);
}
}
break;
}
default:
DbException.throwInternalError("type=" + unionType);
}
if (offsetExpr != null) {
result.setOffset(offsetExpr.getValue(session).getInt());
}
if (limitExpr != null) {
Value v = limitExpr.getValue(session);
if (v != ValueNull.INSTANCE) {
result.setLimit(v.getInt());
}
}
result.done();
if (target != null) {
while (result.next()) {
target.addRow(result.currentRow());
}
result.close();
return null;
}
return result;
}
