int QueryParser::parseIt(int sessionId, string query, TreeNode *&qTree, string &tcResultString, bool toBeTypeChecked, bool toBeOptimized) {
QueryParser::setStatEvalRun(0);
ErrorConsole &ec(ErrorConsole::get_instance(EC_QUERY_PARSER));
try{
qTree = parser->parse(query).release();
debug_print(ec, "Query not parsed properly...\n");
debug_print(ec, (ErrQParser | ENotParsed));
} catch (LoximException &ex) {
debug_print(ec, "Query parsed");
return (ErrQParser | ENotParsed);
}
Indexes::QueryOptimizer::optimizeWithIndexes(qTree);
//Nothing more needs to be done, if this is an internal query. (no screen logging, typechecking, optimization)
if (!toBeTypeChecked && !toBeOptimized) {
return 0;
}
if (Deb::ugOn()) {
cout << " Tree before optimization:";
cout << "\n--------------------------------------\n";
qTree->putToString();
cout << "\n--------------------------------------\n";
}
if ((shouldTypeCheck || shouldOptimize) && !qTree->skipPreprocessing()) {
TreeNode *nt = qTree->clone();
bool metadataCorrect = DataScheme::dScheme(sessionId)->getIsComplete();
bool metadataUpToDate = DataScheme::dScheme(sessionId)->getIsUpToDate();
if (!metadataCorrect || !metadataUpToDate) {
debug_print(ec, "Data scheme is not complete or not up to date); optimization and typechecking blocked.");
}
int typeCheckErrCode = 0;
if (shouldTypeCheck && toBeTypeChecked && metadataCorrect && metadataUpToDate) {
if (isTcOffTmp()) { debug_print(ec, "Typechecking turned off temporarily"); tcResultString = "";}
else {
Deb::ug(" \n \n TYPECHECK BEGIN !!! \n \n");
TypeChecker *tc = new TypeCheck::TypeChecker(nt);
typeCheckErrCode = tc->doTypeChecking(tcResultString);
Deb::ug(" \n \n TYPECHECK DONE... \n ");
if ((typeCheckErrCode != 0) && (typeCheckErrCode != (ErrTypeChecker | ETCNotApplicable))) {
debug_print(ec, "TC, Parser: typeCheckErrorCode says general TC error, should return string to user.\n");
return typeCheckErrCode;
}
if (typeCheckErrCode == 0) {
delete qTree;
qTree = nt;
}
}
} else {
if (shouldTypeCheck && toBeTypeChecked && dmlIncompleteAction == DML_AC_RETURN_ERROR) {
if (!metadataCorrect) return (ErrTypeChecker | EIncompleteMetadata);
else return (ErrTypeChecker | EMetadataOutdated);
}
tcResultString = "";
Deb::ug("TypeChecking is disabled.");
}
if (shouldOptimize && toBeOptimized && metadataCorrect && metadataUpToDate) {
Deb::ug(" optimisation is set ON !");
int optres = 0;
int stat_ev_res;
nt = qTree->clone();
if ((stat_ev_res = this->statEvaluate(sessionId, nt)) != 0) {
Deb::ug("static evaluation did not work out ...");
optres = -1;
} else {
int optres = -2;
DeathRmver *rmver = new DeathRmver(this);
rmver->rmvDeath(nt);
if (this->statEvaluate(sessionId, nt) != 0) optres = -1;
/* The main optimisation loop - factor out single independent subqueries *
* as long as ... such exist ! */
while (optres == -2) {
optres = nt->optimizeTree();
while (nt->getParent() != NULL) nt = nt->getParent();
/*one more static eval, to make sure nodes have the right info.. */
fprintf (stderr, "one more stat eval..\n");
if (this->statEvaluate(sessionId, nt) != 0) optres = -1;
}
AuxRmver *auxRmver = new AuxRmver(this);
auxRmver->rmvAux(nt);
JoinRpcer *joinRpcer = new JoinRpcer(this);
joinRpcer->replaceJoin(nt);
}
if (optres != -1) {
Deb::ug("I'll return optimized tree\n");
qTree = nt;
if (Deb::ugOn()) {
cout << "Tree after optimization:\n--------------------------------------\n";
qTree->putToString(); cout << "\n--------------------------------------\n";
}
} else { Deb::ug("I'll return the tree from before static eval..");}
} else {
if (shouldTypeCheck && toBeTypeChecked && dmlIncompleteAction == DML_AC_RETURN_ERROR) {
if (!metadataCorrect) return (ErrTypeChecker | EIncompleteMetadata);
else return (ErrTypeChecker | EMetadataOutdated);
}
Deb::ug(" optimisation is disabled. \n");
}
} else {
qTree->qpLocalAction(this);
}
Deb::ug(" ParseIt() ends successfully!");
/* cout << "td1------------------------------------------------------------\n";
testDeath("EMP.NAME");
cout << "td2------------------------------------------------------------\n";
testDeath("(EMP join (WORKS_IN.DEPT)).NAME;");
cout << "td3------------------------------------------------------------\n";
*/
if (Deb::ugOn()) {
cout << "===================================================================" << endl;
cout << "P A R S E R R E T U R N S :" << endl;
qTree->serialize();
cout << "\n===================================================================" << endl;
}
return 0;
}
