bool
OrderByExecutor::p_init(AbstractPlanNode* abstract_node,
TempTableLimits* limits)
{
VOLT_TRACE("init OrderBy Executor");
OrderByPlanNode* node = dynamic_cast<OrderByPlanNode*>(abstract_node);
assert(node);
assert(node->getInputTables().size() == 1);
assert(node->getChildren()[0] != NULL);
//
// Our output table should look exactly like out input table
//
node->
setOutputTable(TableFactory::
getCopiedTempTable(node->databaseId(),
node->getInputTables()[0]->name(),
node->getInputTables()[0],
limits));
// pickup an inlined limit, if one exists
limit_node =
dynamic_cast<LimitPlanNode*>(node->
getInlinePlanNode(PLAN_NODE_TYPE_LIMIT));
return true;
}
bool
OrderByExecutor::p_execute(const NValueArray ¶ms)
{
OrderByPlanNode* node = dynamic_cast<OrderByPlanNode*>(m_abstractNode);
assert(node);
TempTable* output_table = dynamic_cast<TempTable*>(node->getOutputTable());
assert(output_table);
Table* input_table = node->getInputTables()[0];
assert(input_table);
//
// OPTIMIZATION: NESTED LIMIT
// How nice! We can also cut off our scanning with a nested limit!
//
int limit = -1;
int offset = -1;
if (limit_node != NULL)
{
limit_node->getLimitAndOffsetByReference(params, limit, offset);
}
VOLT_TRACE("Running OrderBy '%s'", m_abstractNode->debug().c_str());
VOLT_TRACE("Input Table:\n '%s'", input_table->debug().c_str());
TableIterator iterator = input_table->iterator();
TableTuple tuple(input_table->schema());
vector<TableTuple> xs;
ProgressMonitorProxy pmp(m_engine, this);
while (iterator.next(tuple))
{
pmp.countdownProgress();
assert(tuple.isActive());
xs.push_back(tuple);
}
VOLT_TRACE("\n***** Input Table PreSort:\n '%s'",
input_table->debug().c_str());
sort(xs.begin(), xs.end(), TupleComparer(node->getSortExpressions(),
node->getSortDirections()));
int tuple_ctr = 0;
int tuple_skipped = 0;
for (vector<TableTuple>::iterator it = xs.begin(); it != xs.end(); it++)
{
//
// Check if has gone past the offset
//
if (tuple_skipped < offset) {
tuple_skipped++;
continue;
}
VOLT_TRACE("\n***** Input Table PostSort:\n '%s'",
input_table->debug().c_str());
output_table->insertTupleNonVirtual(*it);
pmp.countdownProgress();
//
// Check whether we have gone past our limit
//
if (limit >= 0 && ++tuple_ctr >= limit) {
break;
}
}
VOLT_TRACE("Result of OrderBy:\n '%s'", output_table->debug().c_str());
return true;
}
bool
OrderByExecutor::p_execute(const NValueArray ¶ms)
{
OrderByPlanNode* node = dynamic_cast<OrderByPlanNode*>(m_abstractNode);
assert(node);
Table* output_table = node->getOutputTable();
assert(output_table);
Table* input_table = node->getInputTables()[0];
assert(input_table);
//
// OPTIMIZATION: NESTED LIMIT
// How nice! We can also cut off our scanning with a nested limit!
//
int limit = -1;
int offset = -1;
if (limit_node != NULL)
{
limit_node->getLimitAndOffsetByReference(params, limit, offset);
}
// substitute parameters in the order by expressions
for (int i = 0; i < node->getSortExpressions().size(); i++) {
node->getSortExpressions()[i]->substitute(params);
}
VOLT_TRACE("Running OrderBy '%s'", m_abstractNode->debug().c_str());
VOLT_TRACE("Input Table:\n '%s'", input_table->debug().c_str());
TableIterator iterator = input_table->iterator();
TableTuple tuple(input_table->schema());
vector<TableTuple> xs;
while (iterator.next(tuple))
{
m_engine->noteTuplesProcessedForProgressMonitoring(1);
assert(tuple.isActive());
xs.push_back(tuple);
}
VOLT_TRACE("\n***** Input Table PreSort:\n '%s'",
input_table->debug().c_str());
sort(xs.begin(), xs.end(), TupleComparer(node->getSortExpressions(),
node->getSortDirections()));
int tuple_ctr = 0;
int tuple_skipped = 0;
for (vector<TableTuple>::iterator it = xs.begin(); it != xs.end(); it++)
{
//
// Check if has gone past the offset
//
if (tuple_skipped < offset) {
tuple_skipped++;
continue;
}
VOLT_TRACE("\n***** Input Table PostSort:\n '%s'",
input_table->debug().c_str());
if (!output_table->insertTuple(*it))
{
VOLT_ERROR("Failed to insert order-by tuple from input table '%s'"
" into output table '%s'",
input_table->name().c_str(),
output_table->name().c_str());
return false;
}
//
// Check whether we have gone past our limit
//
if (limit >= 0 && ++tuple_ctr >= limit) {
break;
}
}
VOLT_TRACE("Result of OrderBy:\n '%s'", output_table->debug().c_str());
return true;
}