Status Operators::IndexSelect(const string& result, // Name of the output relation
const int projCnt, // Number of attributes in the projection
const AttrDesc projNames[], // Projection list (as AttrDesc)
const AttrDesc* attrDesc, // Attribute in the selection predicate
const Operator op, // Predicate operator
const void* attrValue, // Pointer to the literal value in the predicate
const int reclen) // Length of a tuple in the output relation
{
cout << "Algorithm: Index Select" << endl;
/* Your solution goes here */
Status Stat;
HeapFile heapfile = HeapFile(result, Stat);
if(Stat != OK) {
cerr << "Open heap file fail" << endl;
return Stat;
}
string relation = projNames[0].relName;
int unique = 0;
RID rid;
Record record;
Record tuple;
//Open index file
Index indScan(relation, attrDesc->attrOffset, attrDesc->attrLen, (Datatype)attrDesc->attrType, unique, Stat);
if(Stat != OK){
return Stat;
}
//Heapscan object to access the getRandomRecord() function
HeapFileScan heapScan=HeapFileScan(relation,attrDesc->attrOffset, attrDesc->attrLen,(Datatype)(attrDesc->attrType),(char *)attrValue,op,Stat);
if(Stat != OK){
return Stat;
}
//Start Index Scan
Stat = indScan.startScan(attrValue);
while(indScan.scanNext(rid)==OK){
heapScan.getRandomRecord(rid,record);
tuple.length = reclen;
tuple.data = malloc(reclen);
int offset = 0;
//Project record
for(int i=0; i<projCnt; ++i){
memcpy((char*)tuple.data + offset, (char*)record.data + projNames[i].attrOffset, projNames[i].attrLen);
offset += projNames[i].attrLen;
}
Stat = heapfile.insertRecord(tuple, rid);
free(tuple.data);
if(Stat != OK){
return Stat;
}
}
indScan.endScan();
heapScan.endScan();
return OK;
}
HeapFile *SortFile(HeapFile *S, int len, int offset)
{
Status s;
Scan *scan;
scan = S->OpenScan(s);
if (s != OK)
{
cerr << "ERROR : cannot open scan on the heapfile to sort.\n";
}
//
// Scan the HeapFile S, new a B+Tree and insert the records into B+Tree.
//
BTreeFile *btree;
btree = new BTreeFile (s, "BTree", ATTR_INT, sizeof(int));
char *recPtr = new char[len];
int recLen = len;
RecordID rid;
while (scan->GetNext(rid, recPtr, recLen) == OK)
{
btree->Insert(recPtr + offset, rid);
}
delete scan;
HeapFile *sorted;
sorted = new HeapFile(NULL, s); // create a temp HeapFile
if (s != OK)
{
cerr << "Cannot create new file for sortedS\n";
}
//
// Now scan the B+-Tree and insert the records into a
// new (sorted) HeapFile.
//
BTreeFileScan *btreeScan;
btreeScan = (BTreeFileScan *)btree->OpenScan(NULL, NULL);
int key;
while (btreeScan->GetNext(rid, &key) == OK)
{
S->GetRecord (rid, recPtr, recLen);
sorted->InsertRecord (recPtr, recLen, rid);
}
btree->DestroyFile();
delete btree;
delete btreeScan;
delete [] recPtr;
return sorted;
}
//-------------------------------------------------------------------
// Sort::MergeManyToOne
//
// Input : numSourceFiles, number of files needed to be merged
// source, array of heap files to be merged
// dest, output heap file
// Output : None
// Return : OK if merging succeeds, FAIL otherwise
//-------------------------------------------------------------------
Status Sort::MergeManyToOne(unsigned int numSourceFiles, HeapFile **source, HeapFile *dest) {
// Open a scan for each source file
Status status;
int numOfRecords = 0, recCounter = 0;
Scan **scanners = new Scan *[numSourceFiles];
RecordID rid; char *recPtr = (char *)malloc(_recLength); int recLen = _recLength;
for (int i=0; i<numSourceFiles; i++) {
HeapFile *hf = source[i];
Scan *scan = hf->OpenScan(status);
if (status != OK) return ReturnFAIL("Opening scanners in MergeManyToOne failed.");
scanners[i] = scan;
numOfRecords += hf->GetNumOfRecords();
}
// Create a vector to hold (numSourceFiles) records to compare
std::vector<std::tuple<char *, int>> values;
char **recPtrArray = new char*[numSourceFiles];
for (int i=0; i<numSourceFiles; i++) {
if (scanners[i]->GetNext(rid,recPtr,recLen) != OK)
return ReturnFAIL("Error scanning files in MergeManyToOne");
recPtrArray[i] = (char *)malloc(recLen);
memcpy(recPtrArray[i],recPtr,recLen);
values.push_back(std::make_tuple(recPtrArray[i],i));
}
while (recCounter < numOfRecords) { // merge till all records are written out
std::sort(values.begin(),values.end(),&CompareForMerge); // sort vector
std::tuple<char *,int> first = values.front(); // get smallest/largest in vector
int firstIndex = std::get<1>(first);
dest->InsertRecord(std::get<0>(first),recLen,rid); // add it to output file
recCounter++;
status = scanners[firstIndex]->GetNext(rid,recPtr,recLen); // try to move pointer
if (status == FAIL) return ReturnFAIL("Error scanning files in MergeManyToOne");
else if (status == OK) { // if there are still records in that file
memcpy(recPtrArray[firstIndex],recPtr,recLen);
values.push_back(std::make_tuple(recPtrArray[firstIndex],firstIndex)); // add new record to vector
}
values.erase(values.begin()); // erase first
}
free(recPtr);
for (int i=0;i<numSourceFiles; i++) {
delete scanners[i];
}
for (int i=0;i<numSourceFiles;i++) {
free(recPtrArray[i]);
}
delete scanners;
delete recPtrArray;
return OK;
}
//-------------------------------------------------------------
// test
//-------------------------------------------------------------
Status test(int t)
{
char outfile[10];
int Rarray[] = { 0, 1, 0, 3, 4, 4, 4 };
int Sarray[] = { 1, 0, 2, 2, 2, 3, 0 };
int R = Rarray[t-1];
int S = Sarray[t-1];
Status s;
sprintf(outfile,"test%d", t);
// Perform sort-merge on R and S
sortMerge sm(files[R],NUM_COLS,attrType,attrSize,JOIN_COL,files[S],NUM_COLS,attrType,attrSize,JOIN_COL,outfile,SORTPGNUM,Ascending,s);
if (s != OK)
{
cout << "Test " << t << " -- sortMerge failed" << endl;
return s;
}
// Write merged results to stdout
HeapFile* outf = new HeapFile (outfile,s);
if (s != OK)
{
cout << "Test " << t << " -- result file not created " << endl;
return s;
}
Scan* scan = outf->openScan(s);
assert(s == OK);
int len;
RID rid;
char rec[sizeof(struct _rec)*2];
cout << endl;
cout << "------------ Test " << t << " ---------------" << endl;
for (s = scan->getNext(rid, rec, len); s == OK; s = scan->getNext(rid, rec, len))
{
cout << (*((struct _rec*)&rec)).key << "\t" << (*((struct _rec*)&rec[8])).key << endl;
}
cout << "-------- Test " << t << " completed --------" << endl;
delete scan;
s=outf->deleteFile();
if(s!=OK) MINIBASE_CHAIN_ERROR(JOINS,s);
delete outf;
return s;
}
//-------------------------------------------------------------
// createFiles
//-------------------------------------------------------------
void createFiles()
{
struct _rec rec;
memcpy(rec.filler," ",4);
for (int i=0; i< NUMFILES; i++)
{
Status s;
RID rid;
HeapFile* f = new HeapFile(files[i],s);
if (s != OK)
cout<<"this is ridiculous !"<<endl;
for (int j=0; j<dsize[i]; j++)
{
rec.key = data[i][j];
s = f->insertRecord((char*)&rec,sizeof(rec),rid);
if (s != OK)
cout<<"this is ridiculous !"<<endl;
}
delete f;
}
}
//--------------------------------------------------------------------
// JoinMethod::SortFile
//
// Purpose : Sorts a relation by an integer attribute.
// Input : file - pointer to the HeapFile to be sorted.
// len - length of the records in the file. (assume fixed size).
// offset - offset of the sort attribute from the beginning of the record.
// Method : We create a B+-Tree using that attribute as the key. Then
// we scan the B+-Tree and insert the records into a new
// HeapFile. he HeapFile guarantees that the order of
// insertion will be the same as the order of scan later.
// Return : The new sorted relation/HeapFile.
//--------------------------------------------------------------------
HeapFile* JoinMethod::SortHeapFile(HeapFile *file, int len, int offset) {
Status s;
Scan *scan;
scan = file->OpenScan(s);
if (s != OK) {
std::cerr << "ERROR : cannot open scan on the heapfile to sort." << std::endl;
}
//
// Scan the HeapFile S, create a new B+Tree and insert the records into B+Tree.
//
BTreeFile *btree;
btree = new BTreeFile (s, "BTree");
char* recPtr = new char[len];
int recLen = len;
RecordID rid;
char* recKey = new char[100];
while (scan->GetNext(rid, recPtr, recLen) == OK)
{
int* valPtr = (int*)(recPtr+offset);
int val = *valPtr;
toString(val,recKey);
btree->Insert(recKey, rid);
}
delete scan;
delete [] recKey;
//std::cout << "created B+ tree!" << std::endl;
HeapFile *sorted = new HeapFile(NULL, s); // create a temp HeapFile
if (s != OK)
{
std::cerr << "Cannot create new file for sortedS\n";
}
// Now scan the B+-Tree and insert the records into a
// new (sorted) HeapFile.
BTreeFileScan* btreeScan = btree->OpenScan(NULL, NULL);
//int key;
char* keyPtr;
while (btreeScan->GetNext(rid, keyPtr) == OK)
{
//std::cout << "scanning " << rid << " " << keyPtr << std::endl;
file->GetRecord (rid, recPtr, recLen);
sorted->InsertRecord (recPtr, recLen, rid);
}
btree->DestroyFile();
delete btree;
delete btreeScan;
delete [] recPtr;
return sorted;
}
Status Updates::Insert(const string& relation, // Name of the relation
const int attrCnt, // Number of attributes specified in INSERT statement
const attrInfo attrList[]) // Value of attributes specified in INSERT statement
{
/* Your solution goes here */
Record record;
int TempattrCnt;
AttrDesc *attrd;
bool insert = true;
Status Stat;
Stat = attrCat->getRelInfo(relation, TempattrCnt, attrd);
if(Stat != OK){
return Stat;
}
if(TempattrCnt == attrCnt){
//Get length of record and allocate memory for it
record.length = attrd[TempattrCnt-1].attrOffset+attrd[TempattrCnt-1].attrLen-attrd[0].attrOffset;
record.data = malloc(record.length);
//Reorder AttrList
attrInfo Tempattrl[TempattrCnt];
for(int i=0; i<TempattrCnt; ++i){
for(int j=0; j<TempattrCnt; ++j){
if(strcmp(attrd[i].attrName, attrList[j].attrName)==0){
Tempattrl[i] = attrList[j];
}
}
}
//Package data into record
for(int i =0; i<TempattrCnt;i++){
int len = strlen((char*)Tempattrl[i].attrValue);
if((Datatype)Tempattrl[i].attrType==2 && len>attrd[i].attrLen){
insert = false;
}else{
memcpy((char*)record.data+attrd[i].attrOffset, Tempattrl[i].attrValue, attrd[i].attrLen);
}
}
//Insert Data Entry into Heapfile
Status openHeapStat, insertHeapStat, openIndexStat, insertIndexStat;
RID recordId;
int unique = 0;
Datatype type;
//Utilities U;//for insert test
HeapFile tempHeap = HeapFile(relation, openHeapStat);
if(openHeapStat == OK && insert){
//insert record into heapfile and release memory
insertHeapStat = tempHeap.insertRecord(record, recordId);
//U.Print(relation);//for insert test
free(record.data);
if(insertHeapStat == OK){
for (int i=0; i< TempattrCnt; ++i){
if(attrd[i].indexed==1){
type = (Datatype)attrd[i].attrType;
Index index = Index(relation, attrd[i].attrOffset, attrd[i].attrLen,type, unique, openIndexStat);
if (openIndexStat == OK){
insertIndexStat = index.insertEntry(Tempattrl[i].attrValue,recordId);
}else{
delete []attrd;
return openIndexStat;
}
}
}
}else{
delete []attrd;
return insertHeapStat;
}
}else{
free(record.data);
if(!insert){
delete []attrd;
return ATTRTOOLONG;
}else{
delete []attrd;
return openHeapStat;
}
}
}else{
delete []attrd;
return ATTRTYPEMISMATCH;
}
delete []attrd;
return OK;
}
Status Operators::SMJ(const string& result, // Output relation name
const int projCnt, // Number of attributes in the projection
const AttrDesc attrDescArray[], // Projection list (as AttrDesc)
const AttrDesc& attrDesc1, // The left attribute in the join predicate
const Operator op, // Predicate operator
const AttrDesc& attrDesc2, // The left attribute in the join predicate
const int reclen) // The length of a tuple in the result relation
{
cout << "Algorithm: SM Join" << endl;
Status getRes = OK;
HeapFile res = HeapFile(result, getRes);
if(getRes != OK){
return getRes;
}
//sort the left relation
//calculate the number of unpinned pages to use
int k = .8 * (bufMgr->numUnpinnedPages());
//get the description of the relation & add up the size of all the attributes
AttrDesc *relationStats;
int numAttr, recSize = 0;
attrCat->getRelInfo(attrDesc1.relName, numAttr, relationStats);
for(int i = 0; i < numAttr; i++){
recSize += relationStats[i].attrLen;
}
//calculation the number of tuples (aka max items) with k pages available
int numTuples = k * PAGESIZE / recSize;
SortedFile left = SortedFile(attrDesc1.relName, attrDesc1.attrOffset, attrDesc1.attrLen, (Datatype)attrDesc1.attrType, numTuples, getRes);
if (getRes != OK){
return getRes;
}
//now do same calculation to sort the right relation
k = .8 * (bufMgr->numUnpinnedPages());
recSize = 0;
attrCat->getRelInfo(attrDesc2.relName, numAttr, relationStats);
for(int i = 0; i < numAttr; i++){
recSize += relationStats[i].attrLen;
}
numTuples = k * PAGESIZE / recSize;
SortedFile right = SortedFile(attrDesc2.relName, attrDesc2.attrOffset, attrDesc2.attrLen, (Datatype)attrDesc2.attrType, numTuples, getRes);
if (getRes != OK){
return getRes;
}
Record leftRec, rightRec, newRec;
newRec.data = malloc(reclen);
newRec.length = 0;
RID leftRid, rightRid, newRecRID;
Status leftIsGood = left.next(leftRec);
if(leftIsGood != OK){
free(newRec.data);
return leftIsGood;
}
Status rightIsGood = right.next(rightRec);
if(rightIsGood != OK){
free(newRec.data);
return rightIsGood;
}
while(rightIsGood == OK && leftIsGood == OK){
//compare the records
int compare = matchRec(leftRec, rightRec, attrDesc1, attrDesc2);
if(compare == 0){
while(compare == 0 && leftIsGood == OK){
right.setMark();
while(compare == 0 and rightIsGood == OK){
//project the joined tuple
newRec.length = 0;
for (int i = 0; i < projCnt; i++){
if (strcmp(attrDescArray[i].relName, attrDesc1.relName) == 0){
memcpy((char*)newRec.data + newRec.length, (char*)leftRec.data+attrDescArray[i].attrOffset, attrDescArray[i].attrLen);
}
else {
memcpy((char*)newRec.data + newRec.length, (char*)rightRec.data+attrDescArray[i].attrOffset, attrDescArray[i].attrLen);
}
newRec.length += attrDescArray[i].attrLen;
}
//insert projected record into result
res.insertRecord(newRec, newRecRID);
//get next record and compare if next() works
rightIsGood = right.next(rightRec);
if(rightIsGood == OK){
compare = matchRec(leftRec, rightRec, attrDesc1, attrDesc2);
}
}
right.gotoMark();
rightIsGood = right.next(rightRec);
leftIsGood = left.next(leftRec);
if(leftIsGood == OK && rightIsGood == OK){
compare = matchRec(leftRec, rightRec, attrDesc1, attrDesc2);
}
}
} else if (compare < 0){
//scan the next on the left
leftIsGood = left.next(leftRec);
} else {
rightIsGood = right.next(rightRec);
}
}
free(newRec.data);
return OK;
}
HeapFile* IndexNestedLoopJoin(JoinSpec specOfR, JoinSpec specOfS)
{
Status status = OK;
// Create a HeapFile for join results
HeapFile* joinedFile = new HeapFile(NULL, status);
if (OK != status)
{
cerr << "ERROR: cannot create a file for the joined relation.\n";
return NULL;
}
int recLenR = specOfR.recLen;
int recLenS = specOfS.recLen;
int recLenJoined = recLenR + recLenS;
char* recR = new char[recLenR];
char* recS = new char[recLenS];
char* recJoined = new char[recLenJoined];
RecordID ridR, ridS, ridJoined;
// Build the B+-tree index on the inner relation (S)
Scan* scanS = specOfS.file->OpenScan(status);
if (OK != status)
{
cerr << "ERROR: cannot open scan on the relation S heap file.\n";
return NULL;
}
BTreeFile* bTree = new BTreeFile(status, "IJBT", ATTR_INT, sizeof(int));
while (OK == scanS->GetNext(ridS, recS, recLenS))
{
bTree->Insert(recS + specOfS.offset, ridS);
}
delete scanS;
// Iterate through the outer relation (R) and join
Scan* scanR = specOfR.file->OpenScan(status);
if (OK != status)
{
cerr << "ERROR: cannot open scan on the relation R heap file.\n";
return NULL;
}
while (OK == scanR->GetNext(ridR, recR, recLenR))
{
int* joinArgR = (int*)&recR[specOfR.offset];
BTreeFileScan* bTreeScan = (BTreeFileScan*)bTree->OpenSearchScan(joinArgR, joinArgR);
int key;
while (OK == bTreeScan->GetNext(ridS, &key))
{
specOfS.file->GetRecord(ridS, recS, recLenS);
MakeNewRecord(recJoined, recR, recS, recLenR, recLenS);
joinedFile->InsertRecord(recJoined, recLenJoined, ridJoined);
}
delete bTreeScan;
}
// Release the allocated resources
delete scanR;
delete[] recR;
delete[] recS;
delete[] recJoined;
delete bTree;
return joinedFile;
}
//---------------------------------------------------------------
// TupleNestedLoop::Execute
//
// Input: left - The left relation to join.
// right - The right relation to join.
// Output: out - The relation to hold the ouptut.
// Return: OK if join completed succesfully. FAIL otherwise.
//
// Purpose: Performs a nested loop join on relations left and right
// a tuple a time. You can assume that left is the outer
// relation and right is the inner relation.
//---------------------------------------------------------------
Status TupleNestedLoops::Execute(JoinSpec& left, JoinSpec& right, JoinSpec& out) {
JoinMethod::Execute(left, right, out);
// Create the temporary heapfile
Status st;
HeapFile *tmpHeap = new HeapFile(NULL, st);
if (st != OK) {
std::cerr << "Failed to create output heapfile." << std::endl;
return FAIL;
}
// Open scan on left relation
Status leftStatus;
Scan *leftScan = left.file->OpenScan(leftStatus);
if (leftStatus != OK) {
std::cerr << "Failed to open scan on left relation." << std::endl;
return FAIL;
}
// Loop over the left relation
char *leftRec = new char[left.recLen];
while (true) {
RecordID leftRid;
leftStatus = leftScan->GetNext(leftRid, leftRec, left.recLen);
if (leftStatus == DONE) break;
if (leftStatus != OK) return FAIL;
// The join attribute on left relation
int *leftJoinValPtr = (int*)(leftRec + left.offset);
// Open scan on right relation
Status rightStatus;
Scan *rightScan = right.file->OpenScan(rightStatus);
if (rightStatus != OK) {
std::cerr << "Failed to open scan on right relation." << std::endl;
return FAIL;
}
// Loop over right relation
char *rightRec = new char[right.recLen];
while (true) {
RecordID rightRid;
rightStatus = rightScan->GetNext(rightRid, rightRec, right.recLen);
if (rightStatus == DONE) break;
if (rightStatus != OK) return FAIL;
// Compare join attribute
int *rightJoinValPtr = (int*)(rightRec + right.offset);
if (*leftJoinValPtr == *rightJoinValPtr) {
// Create the record and insert into tmpHeap...
char *joinedRec = new char[out.recLen];
MakeNewRecord(joinedRec, leftRec, rightRec, left, right);
RecordID insertedRid;
Status tmpStatus = tmpHeap->InsertRecord(joinedRec, out.recLen, insertedRid);
if (tmpStatus != OK) {
std::cerr << "Failed to insert tuple into output heapfile." << std::endl;
return FAIL;
}
delete [] joinedRec;
}
}
delete [] rightRec;
delete rightScan;
}
out.file = tmpHeap;
delete leftScan;
delete [] leftRec;
return OK;
}
HeapFile* BlockNestedLoopJoin(JoinSpec specOfR, JoinSpec specOfS, int B)
{
Status status = OK;
// Create a HeapFile for join results
HeapFile* joinedFile = new HeapFile(NULL, status);
if (OK != status)
{
cerr << "ERROR: cannot create a file for the joined relation.\n";
return NULL;
}
int recLenR = specOfR.recLen;
int recLenS = specOfS.recLen;
int recLenJoined = recLenR + recLenS;
char* recBlockR = new char[B]; // Allocate memory for the block
char* recS = new char[recLenS];
char* recJoined = new char[recLenJoined];
RecordID ridR, ridS, ridJoined;
Scan* scanR = specOfR.file->OpenScan(status);
if (OK != status)
{
cerr << "ERROR: cannot open scan on the relation R heap file.\n";
return NULL;
}
const int recordsPerBlock = B / recLenR;
bool lastBlock = false;
while (!lastBlock)
{
// Fill the block
int i;
for (i = 0; i < recordsPerBlock; i++)
{
if (OK != scanR->GetNext(ridR, recBlockR + i*recLenR, recLenR))
{
lastBlock = true;
break;
}
}
int lastRecordIndex = i;
Scan* scanS = specOfS.file->OpenScan(status);
if (OK != status)
{
cerr << "ERROR: cannot open scan on the relation S heap file.\n";
return NULL;
}
while (OK == scanS->GetNext(ridS, recS, recLenS))
{
int* joinArgS = (int*)&recS[specOfS.offset];
for (int currentRecordIndex = 0; currentRecordIndex < lastRecordIndex; currentRecordIndex++)
{
char* currentRecordPtr = recBlockR + (currentRecordIndex * recLenR);
int* joinArgR = (int*)(currentRecordPtr + specOfR.offset);
if (*joinArgR == *joinArgS)
{
MakeNewRecord(recJoined, currentRecordPtr, recS, recLenR, recLenS);
joinedFile->InsertRecord(recJoined, recLenJoined, ridJoined);
}
}
}
delete scanS;
}
// Release the allocated resources
delete scanR;
delete[] recBlockR;
delete[] recS;
delete[] recJoined;
return joinedFile;
}
Status Operators::INL(const string& result, // Name of the output relation
const int projCnt, // Number of attributes in the projection
const AttrDesc attrDescArray[], // The projection list (as AttrDesc)
const AttrDesc& attrDesc1, // The left attribute in the join predicate
const Operator op, // Predicate operator
const AttrDesc& attrDesc2, // The right attribute in the join predicate (INDEXED)
const int reclen) // Length of a tuple in the output relation
{
cout << "Algorithm: Indexed NL Join" << endl;
AttrDesc* r;
int num;
Status status = attrCat->getRelInfo(result, num, r);
if(status != OK) return status;
// Load heap 1
HeapFileScan heap1 = HeapFileScan(attrDesc1.relName, status);
if (status != OK) return status;
// Load heap 2
HeapFileScan heap2 = HeapFileScan(attrDesc2.relName, status);
if (status != OK) return status;
// Open output heap
HeapFile heapOut = HeapFile(result, status);
if (status != OK) return status;
// Get size of output record
int size = 0;
for (int x = 0; x < projCnt; x++)
{
size += attrDescArray[x].attrLen;
}
// Create/find the index (checked to ensure indexed before entering this fn)
Index index = Index(attrDesc2.relName, attrDesc2.attrOffset, attrDesc2.attrLen, (Datatype)attrDesc2.attrType, 1, status);
if (status != OK) return status;
//Start Join
RID rid, rid1, rid2;
Record record1, record2;
while(heap1.scanNext(rid1, record1) == OK)
{
char* data1 = (char *) record1.data;
// Update Heapfile Scan for Next Loop
heap2 = HeapFileScan(attrDesc2.relName, status);
if(status != OK) return status;
// Restart the Index Scan for Next Loop
status = index.startScan((char *) record1.data + attrDesc1.attrOffset);
if(status != OK) return status;
while(index.scanNext(rid2) == OK)
{
status = heap2.getRandomRecord(rid2, record2);
if(status != OK) return status;
char* data2 = (char *) record2.data;
// Compare the values stored in both records
int valueDif = matchRec(record1, record2, attrDesc1, attrDesc2);
if(!valueDif)
{
// Add to output heap
Record record;
record.data = malloc(size);
record.length = size;
//Need to check through attrDescArray to find outside heap attrDescs
for(int i = 0; i < projCnt; i++)
{
AttrDesc tempAttr = attrDescArray[i];
//Insert from attrDesc1
if( !strcmp(attrDesc1.relName, tempAttr.relName))
{
memcpy(((char*) record.data) + r[i].attrOffset, data1 + tempAttr.attrOffset, tempAttr.attrLen);
}
else
{
memcpy(((char*) record.data) + r[i].attrOffset, data2 + tempAttr.attrOffset, tempAttr.attrLen);
}
}
// Now insert the record into the output
status = heapOut.insertRecord(record, rid);
if(status != OK) return status;
}
}
// End the scan and restart it again next iteration
status = index.endScan();
if(status != OK) return status;
}
status = heap1.endScan();
if(status != OK) return status;
return OK;
}
//---------------------------------------------------------------
// BlockNestedLoop::Execute
//
// Input: left - The left relation to join.
// right - The right relation to join.
// Output: out - The relation to hold the ouptut.
// Return: OK if join completed succesfully. FAIL otherwise.
//
// Purpose: Performs a block nested loops join on the specified relations.
// You can find a specification of this algorithm on page 455. You should
// choose the smaller of the two relations to be the outer relation, but you
// should make sure to concatenate the tuples in order <left, right> when
// producing output. The block size can be specified in the constructor,
// and is stored in the variable blockSize.
//---------------------------------------------------------------
Status BlockNestedLoops::Execute(JoinSpec& left, JoinSpec& right, JoinSpec& out) {
JoinMethod::Execute(left, right, out);
Status s;
HeapFile* tmpHeap = new HeapFile(NULL, s);
if (s != OK) {
std::cout << "Creating new Heap File Failed" << std::endl;
return FAIL;
}
Scan * leftScan = left.file->OpenScan(s);
if (s != OK) {
std::cout << "Open scan left failed" << std::endl;
return FAIL;
}
Scan * rightScan = right.file->OpenScan(s);
if (s != OK) {
std::cout << "Open scan left failed" << std::endl;
return FAIL;
}
RecordID leftRid, rightRid, rightFirstRid, outRid;
// array to hold the "block" in memory
char* blockArray = new char[left.recLen * blockSize];
int blockArraySize = 0; // size in case of half full block
int* leftCurrRec = (int *)blockArray;
int* leftRec = new int[left.numOfAttr];
int* rightRec = new int[right.numOfAttr];
int leftRecLen = left.recLen;
int rightRecLen = right.recLen;
char* newRec = new char[left.recLen + right.recLen];
rightFirstRid = rightScan->currRid;
Status st = OK;
while (true) {
// fill the block with as many records as possible
if (blockArraySize < blockSize) {
st = leftScan->GetNext(leftRid, (char *)leftRec, leftRecLen);
if (st != DONE) {
memcpy(blockArray + left.recLen * blockArraySize, leftRec, left.recLen);
blockArraySize++;
continue;
}
}
// scan through the right, and scan the block in memory for joins
while (rightScan->GetNext(rightRid, (char *)rightRec, rightRecLen) != DONE) {
for (int j = 0; j < blockSize; j++) {
if (j >= blockArraySize) {
break;
}
leftCurrRec = (int *) (blockArray + left.recLen * j);
if (leftCurrRec[left.joinAttr] == rightRec[right.joinAttr]) {
MakeNewRecord(newRec, (char *)leftCurrRec, (char *)rightRec, left, right);
tmpHeap->InsertRecord(newRec, left.recLen + right.recLen, outRid);
}
}
}
rightScan->MoveTo(rightFirstRid);
blockArraySize = 0;
if (st == DONE) {
break;
}
}
out.file = tmpHeap;
//std::cout << "NUM BNL: " << tmpHeap->GetNumOfRecords() << std::endl;
delete leftScan;
delete rightScan;
delete blockArray;
delete leftRec;
delete rightRec;
delete newRec;
return OK;
}
//-------------------------------------------------------------------
// Sort::PassZero
//
// Input : None
// Output : Number of temp files generated after this pass
// Return : OK if Pass 0 succeeds, FAIL otherwise
//-------------------------------------------------------------------
Status Sort::PassZero(int &numTempFiles) {
// Get input file
Status status;
HeapFile inputFile(_inFile, status);
if (status != OK) return ReturnFAIL("Opening input file in PassZero function failed.");
int numRecords = inputFile.GetNumOfRecords();
int recCounter = 0, globalRecCounter = 0;
// Allocate memory
int areaSize = MINIBASE_PAGESIZE * _numBufPages;
char *area = (char *)malloc(areaSize);
char *areaPtr = area;
RecordID rid; char *recPtr = (char *)malloc(_recLength); int recLen = _recLength;
int numRecForSort = std::min(areaSize/_recLength,numRecords); // number of rec in sorting area at once
// Open Scan
Scan *scan = inputFile.OpenScan(status);
if (status != OK) return ReturnFAIL("Opening scan in PassZero function failed.");
// Sort
passZeroRuns = 0;
if (areaSize >= _recLength) { // can fit at least one record
while (scan->GetNext(rid,recPtr,recLen) == OK) {
recCounter++; globalRecCounter++;
// add to memory
if (memcpy(areaPtr,recPtr,recLen) != areaPtr)
return ReturnFAIL("Reading records to memory in PassZero function failed.");
areaPtr += recLen;
areaSize -= recLen;
if (areaSize < _recLength || globalRecCounter == numRecords) { // can't fit another rec or all recs have been added
// sort
switch (_sortType) {
case attrInteger:
std::qsort(area,recCounter,_recLength,CompareInt);
break;
case attrString:
std::qsort(area,recCounter,_recLength,CompareString);
default:
break;
}
// write out
char *fileName = CreateTempFilename(_outFile,0,passZeroRuns);
passZeroRuns++;
HeapFile *tempFile = new HeapFile(fileName,status);
if (status != OK) return ReturnFAIL("Opening temp file in PassZero function failed.");
areaPtr = area;
while (recCounter > 0) { // insert
tempFile->InsertRecord(areaPtr,_recLength,rid);
recCounter--;
areaPtr += _recLength;
}
numTempFiles++;
areaSize = MINIBASE_PAGESIZE * _numBufPages;
areaPtr = area; // reset
delete fileName;
delete tempFile;
}
}
}
free(area);
free(recPtr);
delete scan;
return OK;
}
