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PlanCostEstimator.cpp
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PlanCostEstimator.cpp
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#include "PlanCostEstimator.h"
//static MAP resultSizeStatsTable;
//static MAP scanSizeStatsTable;
static MAPDOUBLE scanSizeStatsTable;
static MAPDOUBLE resultSizeStatsTable;
extern "C" int debug_level;
long double estimateTotalPlanCost (Query *Q, Node *compactGraph[])
{
long double estimateCost = 0;
Node *joinNode, *starterNode = NULL;
//debug_print(debug_level, Q_PLAN_LOG,"%s\n", "Estimating the cost of the above plan");
/*for each join node, find the result size of its subQ*/
for(int i = 0; i < Q->num_join_nodes; i++)
{
joinNode = compactGraph[i];
char hashkey[60], *ptr;
memset(hashkey, '\0', 60);
ptr = hashkey;
generateSubQueryKey(Q,joinNode,&ptr);
joinNode->subQ->hashkey =
(char*)(malloc(sizeof(char) * (strlen(hashkey)+1)));
strcpy(joinNode->subQ->hashkey, hashkey);
joinNode->subQ->resultSize = getResultSize
(joinNode, joinNode->subQ->hashkey, NULL, NULL);
if((long double) joinNode->subQ->resultSize < 0){
Q->num_join_nodes = -1;
return -1;
}
joinNode->subQ->scanSize = getScanSize
(joinNode, joinNode->subQ->hashkey, NULL, NULL);
debug_print(debug_level, Q_PLAN_LOG,
"Join Node %s KEY: %s ResultSize = %Lf, ScanSize = %Lf\n",
joinNode->label, joinNode->subQ->hashkey, joinNode->subQ->resultSize,
joinNode->subQ->scanSize);
}
/* reset the various costs assigned to a join node
during the previous computations of the graph's cost */
for(int i = 0; i < Q->num_join_nodes; i++)
{
joinNode = compactGraph[i];
joinNode->subQ->commCost = 0;
joinNode->subQ->scanCost = 0;
joinNode->subQ->cummCost = 0;
joinNode->subQ->hashJoinCost = 0;
}
/* compute the cost of the whole graph starting from each
starter node, i.e. any node whose in degree is zero */
for(int i = 0; i < Q->num_join_nodes; i++)
{
joinNode = compactGraph[i];
if(joinNode->is_deleted
|| joinNode->in_degree)
{
continue;
}
starterNode = joinNode;
//estimateCost = MAX(estimateCost,
//computeGraphCost_v2(starterNode, 0));
computeGraphCost_v2(Q, starterNode, &estimateCost, 0);
}
if(!starterNode)
{return LDBL_MAX;}
//{return SOME_LARGE_VALUE;}
return estimateCost;
}
/* DFS to compute cost of each node*/
void computeGraphCost_v2 (Query *Q, Node *starterNode, long double *estimateCost, int level)
{
long double commCost, scanCost, hashJoinCost, cummCost;
long double tempCommCost = 0;
//aisha debug_print(debug_level, Q_PLAN_LOG,
//aisha "======================== Node %s, Level %d ===================\n",
//aisha starterNode->label, level);
if(level++ == 0) //base case
{
scanCost = starterNode->subQ->scanSize;
commCost = starterNode->subQ->resultSize;
//aisha printf("\t result size: %Lf\n", starterNode->subQ->resultSize);
/*start accurate comm size code -AISHA - storing fileSize in resultSize
char resultfile[1024];
ulong fsize;
FILE *stream;
sprintf(resultfile, "%hd-%s.txt", query_ndx, starterNode->subQ->hashkey);
if(!(stream = fopen(resultfile, "r")))
printf("Could not open temp rdf result file\n");
fseek(stream, 0L, SEEK_END);
fsize = ftell(stream);
fsize = (sizeof(int8_t) * fsize);
fclose(stream);
printf("\tsize of file %s: %lu\n", resultfile, fsize);
/*end accurate comm size code*/
/*start new commCost*/
//commCost = fsize; -AISHA - commCost directly stores fileSize
tempCommCost = commCost;
// printf("tempCommCost = %Lf\n", tempCommCost);
tempCommCost = ceill(tempCommCost/networkSpeed);
// printf("cost to transmit file = %Lf\n", tempCommCost);
commCost = tempCommCost;
/*end new commCost*/
cummCost = scanCost + commCost;
starterNode->subQ->scanCost = scanCost;
starterNode->subQ->commCost = commCost;
starterNode->subQ->cummCost = cummCost;
//if startNode is also an end node, no intermediate data communication
if(!starterNode->out_degree){ //aisha
starterNode->subQ->cummCost = scanCost;
}
}
/*debug_print(debug_level, Q_PLAN_LOG,"Node %s, cummCost %lu\n",
starterNode->label, starterNode->subQ->cummCost);*/ //aisha
/*debug_print(debug_level, Q_PLAN_LOG,
"Node %s, scanCost %lu, resultSize %lu, commCost %lu, cummCost %lu\n",
starterNode->label, starterNode->subQ->scanSize,
starterNode->subQ->resultSize, starterNode->subQ->commCost,
starterNode->subQ->cummCost); *///aisha
if(!starterNode->out_degree){ //no outgoing neighbours
*estimateCost = starterNode->subQ->cummCost;
// debug_print(debug_level, Q_PLAN_LOG,
// "Node %s has no outgoing neighbours. Estimated Cost = %lu\n",
// starterNode->label, starterNode->subQ->cummCost); //aisha
}
for(Neighbor *ngbr = starterNode->out_neighbors;
ngbr != NULL; ngbr = ngbr->next)
{
scanCost = ngbr->node->subQ->scanSize;
cummCost = ngbr->node->subQ->cummCost;
//aisha debug_print(debug_level, Q_PLAN_LOG,
// "Node %s (ngbr of Node %s), scanCost %Lf, cummCost %Lf\n",
// ngbr->node->label, starterNode->label, scanCost, cummCost);
// (cummCost) ?
//printf("cummCost: %Lf", cummCost);
//printf("MAX(cummCost: %Lf, starterNode->subQ->cummCost: %Lf)\n", cummCost, starterNode->subQ->cummCost);
//printf("MAX(scanCost: %Lf, starterNode->subQ->cummCost: %Lf)\n", scanCost, starterNode->subQ->cummCost);
cummCost = (cummCost) ?
MAX(cummCost, starterNode->subQ->cummCost):
MAX(scanCost, starterNode->subQ->cummCost);
// debug_print(debug_level, Q_PLAN_LOG,
// "Node %s new cummCost: %Lf\n", ngbr->node->label, cummCost);
hashJoinCost = costOfHashJoinBetween(starterNode,ngbr);
cummCost += hashJoinCost;
debug_print(debug_level, Q_PLAN_LOG,
"Node %s (ngbr) hash join cost with Node %s= %Lf. new cummCost: %Lf\n",
ngbr->node->label, starterNode->label, hashJoinCost, cummCost);
if(ngbr->node->out_degree) //add cost of communicating with neighbours
{
/* update all the numbers that need updating in
the ngbr node after its virtual hash join with
the starter node */
ngbr->node->subQ->hashkey = combineSubQKeys
(starterNode, ngbr->node);
ngbr->node->subQ->resultSize = getResultSize
(ngbr->node, ngbr->node->subQ->hashkey, Q, starterNode);
ngbr->node->subQ->scanSize = getScanSize
(ngbr->node, ngbr->node->subQ->hashkey, Q, starterNode);
// printf("computeGraphCost_v2 KEY: %s ResultSize = %Lf, ScanSize = %Lf\n",
// ngbr->node->subQ->hashkey, ngbr->node->subQ->resultSize);
/*debug_printf(debug_level, Q_PLAN_LOG,
"KEY: %s ResultSize = %Lf, ScanSize = %Lf\n",
ngbr->node->subQ->hashkey, ngbr->node->subQ->resultSize,
ngbr->node->subQ->scanSize);*/
// printf("Node %s (ngbr) KEY: %s ResultSize = %Lf, ScanSize = %Lf\n",
// ngbr->node->label, ngbr->node->subQ->hashkey,
// ngbr->node->subQ->resultSize, ngbr->node->subQ->scanSize);
commCost = ngbr->node->subQ->resultSize;
// printf("\t result size: %Lf\n", ngbr->node->subQ->resultSize);
/*start accurate comm size code -AISHA - storing fileSize in resultSize
char resultfile[1024];
ulong fsize;
FILE *stream;
sprintf(resultfile, "%hd-%s.txt", query_ndx, ngbr->node->subQ->hashkey);
if(!(stream = fopen(resultfile, "r")))
printf("Could not open temp rdf result file\n");
fseek(stream, 0L, SEEK_END);
fsize = ftell(stream);
fsize = (sizeof(int8_t) * fsize);
fclose(stream);
printf("\tsize of file %s: %lu\n", resultfile, fsize);
/*end accurate comm size code*/
/*start new commCost*/
//commCost = fsize; -AISHA - commCost directly stores fileSize
tempCommCost = commCost;
tempCommCost = ceill(tempCommCost/networkSpeed);
commCost = tempCommCost;
// printf("\tnewCommCost: %Lf\n", commCost);
/*end new commCost*/
cummCost += commCost;
}
// debug_print(debug_level, Q_PLAN_LOG,
// "Computed costs for Ngbr %s: scanCost: %Lf, commCost %Lf, cummCost %Lf, hashJoinCost %Lf\n",
// ngbr->node->label, scanCost, commCost, cummCost, hashJoinCost);
/* remember the computed costs for ngbr node */
ngbr->node->subQ->scanCost = scanCost;
ngbr->node->subQ->commCost = commCost;
ngbr->node->subQ->cummCost = cummCost;
ngbr->node->subQ->hashJoinCost = hashJoinCost;
}
for(Neighbor *ngbr = starterNode->out_neighbors;
ngbr != NULL; ngbr = ngbr->next)
{
computeGraphCost_v2(Q, ngbr->node, estimateCost, level); //aisha
}
}
/* DFS to compute cost of each node*/
void computeGraphCost (Node *starterNode, ulong *estimateCost, int level)
{
long double hashJoinCost = 0, cost1 = 0, cost2 = 0;
long double commCost = 0, scanCost = 0;
/* scanSize should be replaced by cost */
scanCost = starterNode->subQ->scanSize;
starterNode->subQ->scanCost = scanCost;
if(level == 0)
*estimateCost += scanCost;
commCost = starterNode->subQ->resultSize;
commCost *= AVG_SIZE_OF_TUPLE;
commCost /= PAGE_SIZE;
commCost *= COMM_COST_PER_PAGE;
starterNode->subQ->commCost = commCost;
*estimateCost += commCost;
for(Neighbor *ngbr = starterNode->out_neighbors;
ngbr != NULL; ngbr = ngbr->next)
{
if(!ngbr->node->isJoinNode) { continue; }
scanCost = ngbr->node->subQ->scanSize;
ngbr->node->subQ->scanCost = scanCost;
cost1 = (starterNode->subQ->hashJoinCost == 0) ?
starterNode->subQ->scanCost :
starterNode->subQ->hashJoinCost;
cost1 += starterNode->subQ->commCost;
cost2 = (ngbr->node->subQ->hashJoinCost == 0) ?
labs(ngbr->node->subQ->scanCost - cost1) :
labs(ngbr->node->subQ->hashJoinCost - cost1);
*estimateCost += cost2;
hashJoinCost = costOfHashJoinBetween
(starterNode,ngbr);
ngbr->node->subQ->hashJoinCost = hashJoinCost;
//*estimateCost += hashJoinCost;
ngbr->node->subQ->hashkey = combineSubQKeys
(starterNode, ngbr->node);
//ngbr->node->subQ->resultSize = getResultSize
//(ngbr->node, ngbr->node->subQ->hashkey);
//ngbr->node->subQ->scanSize = getScanSize
//(ngbr->node, ngbr->node->subQ->hashkey);
//computeGraphCost(ngbr->node, estimateCost, ++level);
}
for(Neighbor *ngbr = starterNode->out_neighbors;
ngbr != NULL; ngbr = ngbr->next)
computeGraphCost(ngbr->node, estimateCost, ++level);
}
long double costOfHashJoinBetween (Node *node, Neighbor *ngbr)
{
long double M, N;
long double tempM, tempN;
M = node->subQ->resultSize;
//aisha printf("\t result size: %Lf\n", node->subQ->resultSize);
/*start accurate result size code -AISHA - storing fileSize in resultSize
char resultfileM[1024];
ulong fsizeM;
FILE *streamM;
sprintf(resultfileM, "%hd-%s.txt", query_ndx, node->subQ->hashkey);
if(!(streamM = fopen(resultfileM, "r")))
printf("Could not open temp rdf result file\n");
fseek(streamM, 0L, SEEK_END);
fsizeM = ftell(streamM);
fsizeM = (sizeof(int8_t) * fsizeM);
fclose(streamM);
printf("\tsize of file %s: %lu\n", resultfileM, fsizeM);
/*end accurate result size code*/
/**
M *= AVG_SIZE_OF_TUPLE;
//M /= PAGE_SIZE; - AISHA - consider changing this back for large datasets
tempM = M;
//aisha printf("tempM = %Lf\n", tempM);
**/
//M = fsizeM; - AISHA M directly stores fileSize
tempM = M;
// printf("tempM %Lf\n", tempM);
tempM /= PAGE_SIZE;
// printf("tempM/= PAGE_SIZE = %Lf\n", tempM);
tempM = ceill(tempM);
//aisha printf("ceill(tempM) = %Lf\n", tempM);
M = tempM;
M *= IO_COST_PER_PAGE;
N = ngbr->node->subQ->resultSize;
// printf("\t result size: %lu\n", ngbr->node->subQ->resultSize);
/*start accurate result size code -AISHA storing fileSize in resultSize
char resultfile[1024];
ulong fsize;
FILE *stream;
sprintf(resultfile, "%hd-%s.txt", query_ndx, ngbr->node->subQ->hashkey);
if(!(stream = fopen(resultfile, "r")))
printf("Could not open temp rdf result file\n");
fseek(stream, 0L, SEEK_END);
fsize = ftell(stream);
fsize = (sizeof(int8_t) * fsize);
fclose(stream);
printf("\tsize of file %s: %lu\n", resultfile, fsize);
/*end accurate result size code*/
/**
N *= AVG_SIZE_OF_TUPLE;
// N /= PAGE_SIZE; - AISHA - consider changing this back for large datasets
tempN = N;
// printf("tempN = %Lf\n", tempN);
**/
//N = fsize; - N directly stores fileSize
tempN = N;
tempN /= PAGE_SIZE;
// printf("tempN/= PAGE_SIZE = %Lf\n", tempN);
tempN = ceill(tempN);
// printf("ceill(tempN) = %Lf\n", tempN);
N = tempN;
N *= IO_COST_PER_PAGE;
return 3 * (M + N);
}
/** START RUN TIME FUNCTIONS **/
long double getResultSize (Node *joinNode, char *subQKey, Query *Q, Node *starterNode)
{
MAPDOUBLE::const_iterator iter;
//long double size = SOME_LARGE_VALUE; //initialize to avoid reading random values.
long double size = LDBL_MAX; //initialize to avoid reading random values.
iter = resultSizeStatsTable.find(subQKey);
//getSubQScanStatistics(joinNode->subQ->qstring);
if(iter != resultSizeStatsTable.end())
{
if(iter->second == 0) //what if size is 0 though?
{ return -1; }
// debug_print(debug_level, Q_PLAN_LOG,"RESOLVED RS OF KEY: %s = %lu\n", subQKey, iter->second);
return iter->second;
}
else
{
/* gather the statistic for the this subQ */
// debug_print(debug_level, Q_PLAN_LOG,"COULD NOT RESOLVE RS OF KEY: %s\n", subQKey);
if(Q == NULL)
{createSubQStr(joinNode);}
else
{combineSubQStrs(Q, starterNode, joinNode);} //aisha
size = getSubQResultSize(joinNode->subQ->qstring, subQKey); //AISHA
//getSubQScanStatistics(joinNode->subQ->qstring);
/*start code to keep a copy of rdf scan statistics file - AISHA
char command[100];
char resultfile[1024];
// rename temp file to keep a copy for debugging purposes
sprintf(resultfile, "%d-%s-scan", query_ndx, subQKey);
sprintf(command, "mv temp_scan_result.txt \"%s.txt\"", resultfile);
if(system(command) < 0)
printf("Failed to rename temp_scan_result file\n");
end insert code */
/*start insert code to keep a copy of rdf result file - AISHA
char command[100];
char resultfile[1024];
//rename temp file to keep a copy for debugging purposes
sprintf(resultfile, "%d-%s", query_ndx, subQKey);
sprintf(command, "mv temp_rdf_result.txt \"%s.txt\"", resultfile);
if(system(command) < 0)
printf("Failed to rename temp_rdf_result file\n");
/*end insert code*/
/** size of file AISHA - might want to change this to double**/
//printf("\tsize of file %hd-%s.txt = %Lf\n",
//query_ndx, subQKey, size);
FILE *stream = fopen(STAT_FILE_1, "a");
fprintf(stream, "%s\t\t\t%Lf\n", subQKey, size);
fclose(stream);
resultSizeStatsTable.insert(std::make_pair(subQKey,size));
if(size < 0){
return -1;
}
else{
return size;
}
}
}
void getSubQScanStatistics(char *query)
{
char command[100];
double size = 0;
double value;
char *infile;
char *outfile;
FILE *stream;
char *plan;
unsigned long cost = 0;
char *statsfile;
// /*statsfile = "costFile.txt";
// FILE *file = fopen(statsfile, "r");
// fscanf(file, "%lu", &cost);
// system("rm costFile.txt");
// if(system(command) < 0)
// printf("Failed to remove costFile.txt");
// /*
infile = "temp_scan_query.txt";
outfile = "temp_scan_result.txt";
stream = fopen(infile, "w");
fprintf(stream, "explain %s", query);
fclose(stream);
sprintf(command, "./rdf3xquery %s < %s > %s",
DB, infile, outfile);
if(system(command) < 0)
printf("Failed to execute RDF3xquery");
plan = read_file(outfile);
plan = strtok(plan, " ");
printf("reached subQScanStats\n");
while (plan != NULL)
{
plan = strtok (NULL, " ");
if(plan != NULL)
{value = strtod(plan, NULL);}
if(value >= 0)
{
printf("\tvalue: %f\n", value);
size += value;}
}
//printf("\tSize: %f\n", size);
stream = fopen(outfile, "a");
fprintf(stream, "TOTAL: %f\n", size);
fclose(stream);
}
/** Scan time will always be there - it's calculated in getSubQResultSize **/
long double getScanSize (Node *joinNode, char *subQKey, Query *Q, Node *starterNode)
{
//MAP::const_iterator iter;
MAPDOUBLE::const_iterator iter;
long double size;
//std::cout << "Returning the stats for " << subQKey << std::endl;
iter = scanSizeStatsTable.find(subQKey);
if(iter != scanSizeStatsTable.end())
{
//debug_print(debug_level, Q_PLAN_LOG,"RESOLVED SCAN COST OF KEY: %s = %lu\n", subQKey, iter->second);
return iter->second;
}
}
/** Executes sub-query. Calculates run time and stores in table.
Stores fileSize in table **/
long double getSubQResultSize(char *query, char *subQKey)
{
long double size = 0;
char command[100];
char *statsfile;
char *outfile;
char *infile;
FILE *stream;
struct timeval start_time;
struct timeval end_time;
//struct timeval diff_time;
infile = "temp_query.txt";
outfile = "temp_rdf_result.txt";
statsfile = "temp_res_size.txt";
stream = fopen(infile, "w");
fprintf(stream, "%s", query);
fclose(stream);
sprintf(command, "./rdf3xquery %s < %s > %s",
DB, infile, outfile);
gettimeofday(&start_time, NULL);
if(system(command) < 0)
printf("Failed to execute RDF3xquery");
gettimeofday(&end_time, NULL);
/** calculate runtime **/
long double runtime = (end_time.tv_usec + 1000000 * end_time.tv_sec) - (start_time.tv_usec + 1000000 * start_time.tv_sec);
runtime = runtime/1000000;
/** save runtime in file to load in future runs **/
stream = fopen(STAT_FILE_2, "a");
fprintf(stream, "%s\t\t\t%Lf\n", subQKey, runtime);
fclose(stream);
/** save runtime in table **/
scanSizeStatsTable.insert(std::make_pair(subQKey,runtime));
//sprintf(command, "wc -l %s > %s", outfile, statsfile);
// if(system(command) < 0)
// printf("Failed to find the result size");
// FILE *file = fopen(statsfile, "r");
// fscanf(file, "%lu", &size);
if(!strcmp(read_file(outfile), "<empty result>\n")){
printf("SUB-Q empty result set\n");
return -1;
}
if(!(stream = fopen(outfile, "r")))
printf("Could not open temp rdf result file\n");
fseek(stream, 0L, SEEK_END);
size = (long double)ftell(stream);
size = (sizeof(int8_t) * size);
fclose(stream);
sprintf(command, "rm %s", outfile);
if(system(command) < 0)
printf("Failed to remove temp_rdf_result.txt");
return size;
}
/** END RUN TIME FUNCTIONS **/
/** START OLD FUNCTIONS
ulong getResultSize (Node *joinNode, char *subQKey, Query *Q, Node *starterNode)
{
MAP::const_iterator iter;
ulong size = SOME_LARGE_VALUE; //initialize to avoid reading random values.
iter = resultSizeStatsTable.find(subQKey);
if(iter != resultSizeStatsTable.end())
{
if(iter->second == 0) //what if size is 0 though?
{ return -1; }
// debug_print(debug_level, Q_PLAN_LOG,"RESOLVED RS OF KEY: %s = %lu\n", subQKey, iter->second);
return iter->second;
}
else
{
// debug_print(debug_level, Q_PLAN_LOG,"COULD NOT RESOLVE RS OF KEY: %s\n", subQKey);
if(Q == NULL)
{createSubQStr(joinNode);}
else
{combineSubQStrs(Q, starterNode, joinNode);} //aisha
size = getSubQResultSize(joinNode->subQ->qstring); //AISHA
// start insert code to keep a copy of rdf result file - AISHA
// char command[100];
// char resultfile[1024];
// rename temp file to keep a copy for debugging purposes
// sprintf(resultfile, "%d-%s", query_ndx, subQKey);
// sprintf(command, "mv temp_rdf_result.txt \"%s.txt\"", resultfile);
// if(system(command) < 0)
// printf("Failed to rename temp_rdf_result file\n");
// end insert code
printf("\tsize of file %hd-%s.txt = %lu\n",
query_ndx, subQKey, size);
FILE *stream = fopen(STAT_FILE_1, "a");
fprintf(stream, "%s\t\t\t%lu\n", subQKey, size);
fclose(stream);
resultSizeStatsTable.insert(std::make_pair(subQKey,size));
return size;
}
}
ulong getScanSize (Node *joinNode, char *subQKey, Query *Q, Node *starterNode)
{
MAP::const_iterator iter;
ulong size;
//std::cout << "Returning the stats for " << subQKey << std::endl;
iter = scanSizeStatsTable.find(subQKey);
if(iter != scanSizeStatsTable.end())
{
//if(iter->second == 0)
// { return -1; }
//debug_print(debug_level, Q_PLAN_LOG,"RESOLVED SCAN COST OF KEY: %s = %lu\n", subQKey, iter->second);
return iter->second;
}
else
{
// gather the statistic for the this subQ
// debug_print(debug_level, Q_PLAN_LOG,"COULD NOT RESOLVE SCAN COST OF KEY: %s\n", subQKey);
if(Q == NULL)
{createSubQStr(joinNode);}
else
{combineSubQStrs(Q, starterNode, joinNode);}
size = getSubQScanSize(joinNode->subQ->qstring);
//if(size == 0) { return -1; }
FILE *stream = fopen(STAT_FILE_2, "a");
fprintf(stream, "%s\t\t\t%lu\n", subQKey, size);
fclose(stream);
// printf("scan cost returned by getSubQScanSize: %lu\n", size);
scanSizeStatsTable.insert(std::make_pair(subQKey,size));
// /*start insert code to keep a copy of rdf result file - AISHA
// char command[100];
// char resultfile[1024];
// rename temp file to keep a copy for debugging purposes
// sprintf(resultfile, "%d-%s-scan", query_ndx, subQKey);
// sprintf(command, "mv temp_scan_result.txt \"%s.txt\"", resultfile);
// if(system(command) < 0)
// printf("Failed to rename temp_scan_result file\n");
// /*end insert code
return size;
}
}
unsigned long getSubQScanSize(char *query)
{
char command[100];
double size = 0;
double value;
char *infile;
char *outfile;
FILE *stream;
char *plan;
unsigned long cost = 0;
char *statsfile;
// /*statsfile = "costFile.txt";
// FILE *file = fopen(statsfile, "r");
// fscanf(file, "%lu", &cost);
// system("rm costFile.txt");
// if(system(command) < 0)
// printf("Failed to remove costFile.txt");
// /*
infile = "temp_scan_query.txt";
outfile = "temp_scan_result.txt";
stream = fopen(infile, "w");
fprintf(stream, "explain %s", query);
fclose(stream);
sprintf(command, "./rdf3xquery %s < %s > %s",
DB, infile, outfile);
if(system(command) < 0)
printf("Failed to execute RDF3xquery");
plan = read_file(outfile);
plan = strtok(plan, " ");
while (plan != NULL)
{
plan = strtok (NULL, " ");
if(plan != NULL)
{value = strtod(plan, NULL);}
if(value >= 0)
{size += value;}
}
return (unsigned long) size;
}
unsigned long getSubQResultSize(char *query)
{
unsigned long size = 0;
char command[100];
char *statsfile;
char *outfile;
char *infile;
FILE *stream;
infile = "temp_query.txt";
outfile = "temp_rdf_result.txt";
statsfile = "temp_res_size.txt";
stream = fopen(infile, "w");
fprintf(stream, "%s", query);
fclose(stream);
sprintf(command, "./rdf3xquery %s < %s > %s",
DB, infile, outfile);
if(system(command) < 0)
printf("Failed to execute RDF3xquery");
//sprintf(command, "wc -l %s > %s", outfile, statsfile);
// if(system(command) < 0)
// printf("Failed to find the result size");
// FILE *file = fopen(statsfile, "r");
// fscanf(file, "%lu", &size);
if(!(stream = fopen(outfile, "r")))
printf("Could not open temp rdf result file\n");
fseek(stream, 0L, SEEK_END);
size = ftell(stream);
size = (sizeof(int8_t) * size);
fclose(stream);
sprintf(command, "rm %s", outfile);
if(system(command) < 0)
printf("Failed to remove temp_rdf_result.txt");
return size;
}
/** END OLD FUNCTIONS **/
void generateSubQueryKey (Query *Q, Node *node, char **buf)
{
int numBytes;
CCond *set;
int offset;
numBytes = sprintf(*buf, "<%d>", Q->id);
*buf += numBytes;
for(short cid = 1; cid <= Q->num_conditions; cid++)
{
for(set = node->subQ->optimalset; set != NULL; set = set->next)
{
if(set->condition_p->id != cid)
{ continue; }
numBytes = sprintf(*buf, ".%hd", cid);
*buf += numBytes;
}
}
for(Neighbor *ngbr = node->merged_ngbrs;
ngbr != NULL; ngbr = ngbr->next)
{
debug_print(debug_level, Q_PLAN_LOG,"Generating the hashkey of %s's ngbr: %s\n",
node->label, ngbr->node->label);
generateSubQueryKey(Q, ngbr->node, buf);
}
sprintf(*buf, '\0');
}
char *combineSubQKeys (Node *node, Node *ngbr)
{
char *suffix, *combo_hashkey;
const char *prefix = "<";
char token[15];
short len = strlen(node->subQ->hashkey);
combo_hashkey = (char*) malloc(sizeof(char) * (len+1));
strcpy(combo_hashkey, node->subQ->hashkey);
short offset = len;
suffix = strtok(ngbr->subQ->hashkey, prefix);
while (suffix != NULL)
{
strcpy(token, prefix);
strcpy(token + strlen(prefix), suffix);
int token_len = strlen(token);
if(strstr(node->subQ->hashkey, token) == NULL)
{
if(!(combo_hashkey = (char*) realloc (
combo_hashkey, sizeof(char) * (offset + token_len + 1))))
systemError((char*)"Could not realloc in combineSubQKeys");
strcpy(combo_hashkey + offset, token);
offset += token_len;
}
suffix = strtok(NULL, prefix);
}
combo_hashkey[offset] = '\0';
return combo_hashkey;
}
void combineSubQStrs (Query *Q, Node *node, Node *ngbr)
{
char *existing_results[20];
Condition *existing_conds[20];
char rubbish[5];
Condition *c;
int numBytes;
char *ptr;
char *eptr;
short cid;
int size;
int i;
ptr = ngbr->subQ->hashkey;
eptr = ptr + strlen(ptr);
size = sizeof(existing_results);
memset(&existing_results[0], 0, size);
size = sizeof(existing_conds);
memset(&existing_conds[0], 0, size);
while(ptr < eptr)
{
numBytes = sscanf(ptr, "%[<]", rubbish);
ptr += numBytes;
numBytes = sscanf(ptr, "%[0-9]", rubbish);
ptr += numBytes;
numBytes = sscanf(ptr, "%[>]", rubbish);
ptr += numBytes;
numBytes = sscanf(ptr, ".%d", &cid);
ptr += numBytes + 1;
/* find this condition among the list of all conds. */
for(c = Q->conditions; c != NULL; c = c->next)
{
if (c->id == cid) break;
}
/* if the condition doesn't already exist, add it */
for(i = 0; existing_conds[i] != 0; i++)
{
if (existing_conds[i]->id == cid) continue;
}
existing_conds[i] = c;