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; }
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; }