void QueryEvaluator::evaluateQuery() {
if (checkValid) {
TNode * select_node = tree.getRoot();
//select_node->printTNode();
ResultManager result_manager = ResultManager();
bool is_satisfied = true;
int size = select_node->getNumChildren();
// ignore result node and process with all clause node
for (int i=1; i<size; i++) {
TNode * clause_node = select_node->getChildAtIndex(i);
vector<string> symbols = getSymbolsUsedBy(clause_node);
ResultTable * temp_results = result_manager.extractTable(symbols);
is_satisfied = evaluateClause(clause_node, temp_results);
if (!is_satisfied) {
break;
} else {
result_manager.insertTable(temp_results);
}
if (AbstractWrapper::GlobalStop) {
vector<string> result;
resultList.push_back(result);
}
}
TNode * result_node = select_node->getChildAtIndex(0);
vector<string> result = extractResult(result_node, &result_manager, is_satisfied);
resultList.push_back(result);
} else {
vector<string> result = extractResult();
resultList.push_back(result);
}
}
addressType
evaluateMswitch(void)
{
addressType pattern;
pattern = evaluateExpression();
while (*pc != END_TAG)
if (evaluateClause(pattern))
break;
while (*pc != END_TAG)
skipClause();
overByte();
return(0);
}
bool QueryEvaluator::evaluateClause(TNode * clause_node, ResultTable * temp_results) {
bool is_satisfied = true;
int size = temp_results->getSize();
if (size==0) {
// insert a dummy row into temp_results
int symbol_num = temp_results->getSymbolSize();
vector<int> dummy_values (symbol_num, -1);
temp_results->insertValRow(dummy_values, false);
size = 1;
}
for (int i=0; i<size; i++) {
vector<int> row = temp_results->getValRow(i);
vector<vector<int>> new_rows;
is_satisfied = evaluateClause(clause_node, row, &new_rows, temp_results);
if (is_satisfied) {
temp_results->insertValRow(new_rows, true);
}
}
temp_results->deleleInvalidRows();
if (temp_results->getSymbolSize()==0) return is_satisfied;
return (temp_results->getSize()!=0);
}
