/**
* Set up a multi-column temp output table for those executors that require one.
* Called from p_init.
*/
void AbstractExecutor::setTempOutputTable(const ExecutorVector& executorVector,
const string tempTableName) {
TupleSchema* schema = m_abstractNode->generateTupleSchema();
int column_count = schema->columnCount();
std::vector<std::string> column_names(column_count);
assert(column_count >= 1);
const std::vector<SchemaColumn*>& outputSchema = m_abstractNode->getOutputSchema();
for (int ctr = 0; ctr < column_count; ctr++) {
column_names[ctr] = outputSchema[ctr]->getColumnName();
}
if (executorVector.isLargeQuery()) {
m_tmpOutputTable = TableFactory::buildLargeTempTable(tempTableName,
schema,
column_names);
}
else {
m_tmpOutputTable = TableFactory::buildTempTable(tempTableName,
schema,
column_names,
executorVector.limits());
}
m_abstractNode->setOutputTable(m_tmpOutputTable);
}
bool UnionExecutor::p_init(AbstractPlanNode* abstract_node,
const ExecutorVector& executorVector)
{
VOLT_TRACE("init Union Executor");
assert(! executorVector.isLargeQuery());
UnionPlanNode* node = dynamic_cast<UnionPlanNode*>(abstract_node);
assert(node);
//
// First check to make sure they have the same number of columns
//
assert(node->getInputTableCount() > 0);
Table* input_table_0 = node->getInputTable(0);
const TupleSchema *table_0_schema = input_table_0->schema();
for (int table_ctr = 1, table_cnt = (int)node->getInputTableCount();
table_ctr < table_cnt;
++table_ctr) {
Table* input_table_n = node->getInputTable(table_ctr);
if (input_table_0->columnCount() != input_table_n->columnCount()) {
VOLT_ERROR("Table '%s' has %d columns, but table '%s' has %d"
" columns",
input_table_0->name().c_str(),
input_table_0->columnCount(),
input_table_n->name().c_str(),
input_table_n->columnCount());
return false;
}
//
// Then check that they have the same types
//
// iterate over all columns in the first table
for (int col_ctr = 0, col_cnt = table_0_schema->columnCount();
col_ctr < col_cnt;
col_ctr++) {
// get the type for the current column
ValueType type_0 = table_0_schema->columnType(col_ctr);
const TupleSchema *table_n_schema = input_table_n->schema();
ValueType type_n = table_n_schema->columnType(col_ctr);
if (type_0 != type_n) {
VOLT_ERROR("Table '%s' has value type '%s' for column '%d',"
" table '%s' has value type '%s' for column '%d'",
input_table_0->name().c_str(), getTypeName(type_0).c_str(), col_ctr,
input_table_n->name().c_str(), getTypeName(type_n).c_str(), col_ctr);
return false;
}
}
}
//
// Create our output table that will hold all the tuples that we are appending into.
// Since we're are assuming that all of the tables have the same number of columns with
// the same format. Therefore, we will just grab the first table in the list
//
node->setOutputTable(TableFactory::buildCopiedTempTable(node->getInputTable(0)->name(),
node->getInputTable(0),
executorVector));
m_setOperator.reset(detail::SetOperator::getSetOperator(node));
return true;
}