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ql_treeplan.cc
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#include "ql_treeplan.h"
#include <stdio.h>
#include <cstddef>
#include <string>
#include <map>
#include "ql_iterator.h"
#include "it_indexscan.h"
#include "it_filescan.h"
#include "ql_common.h"
#include "ql_internal.h"
using namespace std;
// *************************
// Constructor & destructor
// *************************
QL_TreePlan::QL_TreePlan(SM_Manager *ipSmm, IX_Manager *ipIxm, RM_Manager *ipRmm)
{
_pSmm = ipSmm;
_pIxm = ipIxm;
_pRmm = ipRmm;
_pLc = NULL;
_pRc = NULL;
_nNodeAttributes = 0;
_nodeAttributes = NULL;
_bufferSize = 0;
_nOperationAttributes = 0;
_operationAttributes = NULL;
_scanStatus = SCANCLOSED;
_pScanIterator = NULL;
_pJoinData = NULL;
}
QL_TreePlan::~QL_TreePlan()
{
_pSmm = NULL;
if(_nodeAttributes != NULL)
{
delete[] _nodeAttributes;
_nodeAttributes = NULL;
}
if(_operationAttributes != NULL)
{
delete[] _operationAttributes;
_operationAttributes = NULL;
}
if(_pJoinData != NULL)
{
delete[] _pJoinData;
_pJoinData = NULL;
}
if(_pLc != NULL)
{
delete _pLc;
_pLc = NULL;
}
if(_pRc != NULL)
{
delete _pRc;
_pRc = NULL;
}
}
// *************************
// Setters
// *************************
void QL_TreePlan::SetNodeOperation(NodeOperation iNodeOperation)
{
_nodeOperation = iNodeOperation;
}
void QL_TreePlan::SetLeftChild(QL_TreePlan *ipTreePlan)
{
if(_pLc != NULL)
{
delete _pLc;
}
_pLc = ipTreePlan;
}
void QL_TreePlan::SetRightChild(QL_TreePlan *ipTreePlan)
{
if(_pRc != NULL)
{
delete _pRc;
}
_pRc = ipTreePlan;
}
// *************************
// Builders
// *************************
RC QL_TreePlan::BuildFromQuery(const std::vector<RelAttr> &selAttrs,
const std::vector<const char*> &relations,
const std::vector<Condition> &conditions)
{
RC rc = OK_RC;
// first, check if there is more than one relation involved
// if so, the node is a join
if(relations.size() > 1)
{
bool cartesianProduct = true;
for(unsigned int i=0; i<conditions.size(); i++)
{
if(conditions[i].bRhsIsAttr)
{
cartesianProduct = false;
break;
}
}
if(cartesianProduct)
{
if((rc = BuildFromCartesianProduct(selAttrs, relations, conditions)))
goto err_return;
}
else
{
if((rc = BuildFromJoin(selAttrs, relations, conditions)))
goto err_return;
}
}
else
{
//cout << "SINGLE RELATION detected" << endl;
if((rc = BuildFromSingleRelation(selAttrs, relations, conditions)))
goto err_return;
}
return rc;
err_return:
return rc;
}
RC QL_TreePlan::BuildFromSingleRelation(const std::vector<RelAttr> &selAttrs,
const std::vector<const char*> &relations,
const std::vector<Condition> &conditions)
{
RC rc = OK_RC;
// more than one condition, have to split them
if(conditions.size() > 1)
{
//cout << "Lots of conditions detected" << endl;
// create the new nodes
QL_TreePlan *pProjector = new QL_TreePlan(_pSmm, _pIxm, _pRmm);
QL_TreePlan *pSelect = new QL_TreePlan(_pSmm, _pIxm, _pRmm);
QL_TreePlan *pComparison = NULL;
// build the comparisons, the first comparison node is this
std::vector<Condition> vConditions(conditions);
pComparison = this;
if((rc = pComparison->BuildFromComparison(selAttrs, relations, vConditions)))
return rc;
vConditions.pop_back();
QL_TreePlan *pFather = this;
while(vConditions.size()>1)
{
// create the new comparison node
pComparison = new QL_TreePlan(_pSmm, _pIxm, _pRmm);
if((rc = pComparison->BuildFromComparison(selAttrs, relations, vConditions)))
return rc;
// update the father
pFather->SetLeftChild(pComparison);
pFather = pComparison;
vConditions.pop_back();
}
// update the last comparison node
pComparison->SetLeftChild(pProjector);
pProjector->SetLeftChild(pSelect);
// build the projection
if((rc = pProjector->BuildFromProjection(selAttrs, relations, conditions)))
return rc;
// build the selection node
if((rc = pSelect->BuildFromSelect(selAttrs, relations, vConditions)))
return rc;
}
else
{
//cout << "Few conditions detected..." << endl;
// create the new nodes
QL_TreePlan *pSelect = new QL_TreePlan(_pSmm, _pIxm, _pRmm);
// update the nodes
this->SetLeftChild(pSelect);
// build the projection
if((rc = this->BuildFromProjection(selAttrs, relations, conditions)))
return rc;
// build the selection node
if((rc = pSelect->BuildFromSelect(selAttrs, relations, conditions)))
return rc;
}
return rc;
}
RC QL_TreePlan::BuildFromComparison(const std::vector<RelAttr> &selAttrs,
const std::vector<const char*> &relations,
const std::vector<Condition> &conditions)
{
RC rc = OK_RC;
// cout << "Build from comparison" << endl;
_nodeOperation = COMPARISON;
_sRelName.assign(relations[0]);
if((rc = ComputeAttributesStructure(selAttrs, _nNodeAttributes, _nodeAttributes, _bufferSize)))
return rc;
// copy the last condition
if(conditions.size() > 0)
_conditions.push_back(conditions.back());
return rc;
err_return:
return rc;
}
RC QL_TreePlan::BuildFromProjection(const std::vector<RelAttr> &selAttrs,
const std::vector<const char*> &relations,
const std::vector<Condition> &conditions)
{
RC rc = OK_RC;
// cout << "Build from projection" << endl;
_nodeOperation = PROJECTION;
if((rc = ComputeAttributesStructure(selAttrs, _nNodeAttributes, _nodeAttributes, _bufferSize)))
return rc;
return rc;
err_return:
return rc;
}
RC QL_TreePlan::BuildFromJoin(const std::vector<RelAttr> &selAttrs,
const std::vector<const char*> &relations,
const std::vector<Condition> &conditions)
{
RC rc = OK_RC;
bool oneRelationIsFine = false;
// cout << "Build from join" << endl;
_nodeOperation = JOIN;
if((rc = ComputeAttributesStructure(selAttrs, _nNodeAttributes, _nodeAttributes, _bufferSize)))
return rc;
_pLc = new QL_TreePlan(_pSmm, _pIxm, _pRmm);
_pRc = new QL_TreePlan(_pSmm, _pIxm, _pRmm);
// initialize children vectors
std::vector<RelAttr> left_selAttrs;
std::vector<const char*> left_relations;
std::vector<Condition> left_conditions;
std::vector<RelAttr> right_selAttrs;
std::vector<const char*> right_relations;
std::vector<Condition> right_conditions;
// find the relations that appears once
// initialize the hashmap
std::map<string, int> relationsNb;
for(unsigned int i=0; i<relations.size(); i++)
{
relationsNb.insert(std::pair<string, int>(relations[i], 0));
}
// update the hashmap
for(unsigned int i=0; i<conditions.size(); i++)
{
if(conditions[i].bRhsIsAttr && conditions[i].op == EQ_OP)
{
std::map<string,int>::iterator it;
string str(conditions[i].lhsAttr.relName);
std::size_t found = str.find_first_of(".");
it=relationsNb.find(str.substr(0, found));
it->second++;
str.assign(conditions[i].rhsAttr.relName);
found = str.find_first_of(".");
it=relationsNb.find(str.substr(0, found));
it->second++;
}
}
// put the iterator on a relation that appears once
std::map<string,int>::iterator it;
for (it=relationsNb.begin(); it!=relationsNb.end(); ++it)
{
if(it->second == 1)
{
oneRelationIsFine = true;
break;
}
}
if(!oneRelationIsFine)
{
return QL_BAD_JOIN;
}
// copy conditions in left & right children
for(unsigned int i=0;i<conditions.size();i++)
{
string str(conditions[i].lhsAttr.relName);
std::size_t found = str.find_first_of(".");
// the left hand side matches the iterator
if(str.substr(0, found).compare(it->first)==0)
{
// the right hand side is only a value
if(!conditions[i].bRhsIsAttr)
{
right_conditions.push_back(conditions[i]);
}
// the right hand side is an attribute, it corresponds to the join equality
else
{
// join equality treatment
_operationAttributes = new DataAttrInfo[2];
_nOperationAttributes = 2;
// left side
if((rc = _pSmm->GetAttributeStructure(conditions[i].lhsAttr.relName, conditions[i].lhsAttr.attrName, _operationAttributes[1])))
return rc;
// right side
if((rc = _pSmm->GetAttributeStructure(conditions[i].rhsAttr.relName, conditions[i].rhsAttr.attrName, _operationAttributes[0])))
return rc;
}
}
// the left hand side does not match the iterator
else
{
// the right hand side is only a value
if(!conditions[i].bRhsIsAttr)
{
left_conditions.push_back(conditions[i]);
}
// the right hand side is an attribute
else
{
str.assign(conditions[i].rhsAttr.relName);
found = str.find_first_of(".");
// it corresponds to the join equality
if(str.substr(0, found).compare(it->first)==0)
{
// join equality treatment
_operationAttributes = new DataAttrInfo[2];
_nOperationAttributes = 2;
// left side
if((rc = _pSmm->GetAttributeStructure(conditions[i].lhsAttr.relName, conditions[i].lhsAttr.attrName, _operationAttributes[0])))
return rc;
// right side
if((rc = _pSmm->GetAttributeStructure(conditions[i].rhsAttr.relName, conditions[i].rhsAttr.attrName, _operationAttributes[1])))
return rc;
}
// another join is spotted
else
{
left_conditions.push_back(conditions[i]);
}
}
}
}
// copy relations in left & right children
for(unsigned int i=0;i<relations.size();i++)
{
// the relation matches the iterator
if(strcmp(it->first.c_str(),relations[i])==0)
{
right_relations.push_back(relations[i]);
}
// the relation does not match the iterator
else
{
left_relations.push_back(relations[i]);
}
}
// copy attributes in left & right children
for(unsigned int i=0;i<selAttrs.size();i++)
{
// the attributes belongs to a relation that matches the iterator
if(strcmp(it->first.c_str(),selAttrs[i].relName)==0)
{
right_selAttrs.push_back(selAttrs[i]);
}
// the attributes belongs to a relation that does not match the iterator
else
{
left_selAttrs.push_back(selAttrs[i]);
}
}
// build the left child
if((rc = _pLc->BuildFromQuery(left_selAttrs, left_relations, left_conditions)))
goto err_return;
// build the right child
if((_pRc->BuildFromQuery(right_selAttrs, right_relations, right_conditions)))
goto err_return;
// cout << "End Build from join" << endl;
return rc;
err_return:
return rc;
}
RC QL_TreePlan::BuildFromSelect(const std::vector<RelAttr> &selAttrs,
const std::vector<const char*> &relations,
const std::vector<Condition> &conditions)
{
RC rc = OK_RC;
// cout << "Build from select" << endl;
_nodeOperation = SELECT;
if((rc = ComputeAttributesStructure(selAttrs, _nNodeAttributes, _nodeAttributes, _bufferSize)))
return rc;
if(relations.size() == 0)
{
return QL_NO_RELATION;
}
_sRelName.assign(relations[0]);
if(conditions.size()>0)
{
_conditions.push_back(conditions.back());
}
return rc;
}
RC QL_TreePlan::BuildFromCartesianProduct(const std::vector<RelAttr> &selAttrs,
const std::vector<const char*> &relations,
const std::vector<Condition> &conditions)
{
RC rc = OK_RC;
// cout << "Build from cartesian product" << endl;
_nodeOperation = CARTESIANPRODUCT;
if((rc = ComputeAttributesStructure(selAttrs, _nNodeAttributes, _nodeAttributes, _bufferSize)))
return rc;
_pLc = new QL_TreePlan(_pSmm, _pIxm, _pRmm);
_pRc = new QL_TreePlan(_pSmm, _pIxm, _pRmm);
// initialize children vectors
std::vector<RelAttr> left_selAttrs;
std::vector<const char*> left_relations;
std::vector<Condition> left_conditions;
std::vector<RelAttr> right_selAttrs;
std::vector<const char*> right_relations;
std::vector<Condition> right_conditions;
// copy conditions in left & right children
for(unsigned int i=0;i<conditions.size();i++)
{
string str(conditions[i].lhsAttr.relName);
std::size_t found = str.find_first_of(".");
// the left hand side matches the iterator
if(str.substr(0, found).compare(relations[0])==0)
{
right_conditions.push_back(conditions[i]);
}
// the left hand side does not match the iterator
else
{
left_conditions.push_back(conditions[i]);
}
}
// copy relations in left & right children
for(unsigned int i=0;i<relations.size();i++)
{
// the relation matches the iterator
if(strcmp(relations[0],relations[i])==0)
{
right_relations.push_back(relations[i]);
}
// the relation does not match the iterator
else
{
left_relations.push_back(relations[i]);
}
}
// copy attributes in left & right children
for(unsigned int i=0;i<selAttrs.size();i++)
{
// the attributes belongs to a relation that matches the iterator
if(strcmp(relations[0],selAttrs[i].relName)==0)
{
right_selAttrs.push_back(selAttrs[i]);
}
// the attributes belongs to a relation that does not match the iterator
else
{
left_selAttrs.push_back(selAttrs[i]);
}
}
// build the left child
if((rc = _pLc->BuildFromQuery(left_selAttrs, left_relations, left_conditions)))
goto err_return;
// build the right child
if((_pRc->BuildFromQuery(right_selAttrs, right_relations, right_conditions)))
goto err_return;
return rc;
err_return:
return rc;
}
// *************************
// Operators
// *************************
RC QL_TreePlan::GetNext(int &nAttributes, DataAttrInfo *&tNodeAttributes, char * &pData)
{
RC rc = OK_RC;
switch(_nodeOperation)
{
case UNION:
rc = PerformUnion(nAttributes, tNodeAttributes, pData);
break;
case COMPARISON:
rc = PerformComparison(nAttributes, tNodeAttributes, pData);
break;
case PROJECTION:
rc = PerformProjection(nAttributes, tNodeAttributes, pData);
break;
case JOIN:
rc = PerformJoin(nAttributes, tNodeAttributes, pData);
break;
case SELECT:
rc = PerformSelect(nAttributes, tNodeAttributes, pData);
break;
case CARTESIANPRODUCT:
rc = PerformCartesianProduct(nAttributes, tNodeAttributes, pData);
break;
default:
rc = QL_UNKNOWN_TYPE;
}
return rc;
}
RC QL_TreePlan::PerformUnion(int &nAttributes, DataAttrInfo *&tNodeAttributes, char * &pData)
{
RC rc = OK_RC;
nAttributes = 0;
tNodeAttributes = NULL;
pData = NULL;
//cout << "Perform UNION" << endl;
return rc;
}
RC QL_TreePlan::PerformComparison(int &nAttributes, DataAttrInfo *&tNodeAttributes, char * &pData)
{
RC rc = OK_RC;
// cout << "Perform COMPARISON" << endl;
int left_nAttributes;
DataAttrInfo *left_nodeAttributes = NULL;
char *left_pData = NULL;
bool isConditionPassed = false;
int index;
// check if left child exists
if(_pLc == NULL)
{
return QL_NULL_CHILD;
}
// create the output buffer
pData = new char[_bufferSize];
while(!isConditionPassed)
{
// get the information from left child
if((rc = _pLc->GetNext(left_nAttributes, left_nodeAttributes, left_pData)))
{
if(pData != NULL)
{
delete[] pData;
pData = NULL;
}
return rc;
}
// copy the required attributes in the output buffer
for(int i=0; i<left_nAttributes; i++)
{
// check if the attribute must be copied
if((rc = IsAttributeInList(_nNodeAttributes, _nodeAttributes, left_nodeAttributes[i], index)))
return rc;
// the attribute must be copied
if(index >= 0)
{
// a condition exists
if(_conditions.size() > 0)
{
// the left hand side of the condition matches the current attribute
if(strcmp(_conditions[0].lhsAttr.relName, left_nodeAttributes[i].relName) == 0 &&
strcmp(_conditions[0].lhsAttr.attrName, left_nodeAttributes[i].attrName) == 0)
{
switch(left_nodeAttributes[i].attrType)
{
case INT:
case FLOAT:
float fAttrValue, fRefValue;
// subcase: INT
if(left_nodeAttributes[i].attrType == INT)
{
int attrValue, refValue;
memcpy(&attrValue,
left_pData + left_nodeAttributes[i].offset,
sizeof(int));
memcpy(&refValue,
_conditions[0].rhsValue.data,
sizeof(int));
fAttrValue = attrValue;
fRefValue = refValue;
}
// subcase: FLOAT
else
{
memcpy(&fAttrValue,
left_pData + left_nodeAttributes[i].offset,
sizeof(float));
memcpy(&fRefValue,
_conditions[0].rhsValue.data,
sizeof(float));
}
switch(_conditions[0].op)
{
case EQ_OP:
isConditionPassed = fAttrValue == fRefValue;
break;
case LE_OP:
isConditionPassed = fAttrValue <= fRefValue;
break;
case LT_OP:
isConditionPassed = fAttrValue < fRefValue;
break;
case GE_OP:
isConditionPassed = fAttrValue >= fRefValue;
break;
case GT_OP:
isConditionPassed = fAttrValue > fRefValue;
break;
case NE_OP:
isConditionPassed = fAttrValue != fRefValue;
break;
default:
isConditionPassed = true;
}
break;
case STRING:
char strAttrValue[MAXSTRINGLEN], strRefValue[MAXSTRINGLEN];
strcpy(strAttrValue,
left_pData + left_nodeAttributes[i].offset);
strcpy(strRefValue,
(char*) _conditions[0].rhsValue.data);
// memcpy(strAttrValue,
// left_pData + left_nodeAttributes[i].offset,
// left_nodeAttributes[i].attrLength);
// memcpy(strRefValue,
// _conditions[0].rhsValue.data,
// left_nodeAttributes[i].attrLength);
switch(_conditions[0].op)
{
case EQ_OP:
isConditionPassed = strcmp(strAttrValue, strRefValue) == 0;
break;
case LE_OP:
isConditionPassed = strcmp(strAttrValue, strRefValue) <= 0;
break;
case LT_OP:
isConditionPassed = strcmp(strAttrValue, strRefValue) < 0;
break;
case GE_OP:
isConditionPassed = strcmp(strAttrValue, strRefValue) >= 0;
break;
case GT_OP:
isConditionPassed = strcmp(strAttrValue, strRefValue) > 0;
break;
case NE_OP:
isConditionPassed = strcmp(strAttrValue, strRefValue) != 0;
break;
default:
isConditionPassed = true;
}
break;
default:
isConditionPassed = true;
break;
}
}
}
// copy the attribute to the current buffer
memcpy(pData + _nodeAttributes[index].offset,
left_pData + left_nodeAttributes[i].offset,
left_nodeAttributes[i].attrLength);
}
}
if(left_pData)
{
delete[] left_pData;
left_pData = NULL;
}
}
// assign the output vars
nAttributes = _nNodeAttributes;
tNodeAttributes = _nodeAttributes;
// cout << "End COMPARISON" << endl;
return rc;
}
RC QL_TreePlan::PerformProjection(int &nAttributes, DataAttrInfo *&tNodeAttributes, char * &pData)
{
RC rc = OK_RC;
// cout << "Perform PROJECTION" << endl;
int left_nAttributes;
DataAttrInfo *left_nodeAttributes = NULL;
char *left_pData = NULL;
int index;
// check if left child exists
if(_pLc == NULL)
{
return QL_NULL_CHILD;
}
// get the information from left child
if((rc = _pLc->GetNext(left_nAttributes, left_nodeAttributes, left_pData)))
return rc;
// create the output buffer
pData = new char[_bufferSize];
// copy the required attributes in the output buffer
for(int i=0; i<left_nAttributes; i++)
{
if((rc = IsAttributeInList(_nNodeAttributes, _nodeAttributes, left_nodeAttributes[i], index)))
{
delete[] pData;
delete[] left_pData;
return rc;
}
if(index >= 0)
{
memcpy(pData + _nodeAttributes[index].offset,
left_pData + left_nodeAttributes[i].offset,
left_nodeAttributes[i].attrLength);
}
}
// assign the output vars
nAttributes = _nNodeAttributes;
tNodeAttributes = _nodeAttributes;
if(left_pData != NULL)
{
delete[] left_pData;
left_pData = NULL;
}
// cout << "End PROJECTION" << endl;
return rc;
}
RC QL_TreePlan::PerformJoin(int &nAttributes, DataAttrInfo *&tNodeAttributes, char * &pData)
{
RC rc = OK_RC;
int right_nAttributes;
DataAttrInfo *right_nodeAttributes = NULL;
char *right_pData = NULL;
bool joinCondition = false;
int index;
// cout << "Perform JOIN" << endl;
// check if left child exists
if(_pLc == NULL)
{
return QL_NULL_CHILD;
}
if(_pJoinData == NULL)
{
if((rc = _pLc->GetNext(_nJoinAttributes, _nodeJoinAttributes, _pJoinData)))
return rc;
}
// get the information from left child
while(!joinCondition)
{
// delete the previous right child
if(right_pData != NULL)
{
delete[] right_pData;
right_pData = NULL;
}
// get the next right child
if((rc = _pRc->GetNext(right_nAttributes, right_nodeAttributes, right_pData)))
{
// delete the previous left child
if(_pJoinData != NULL)
{
delete[] _pJoinData;
_pJoinData = NULL;
_nodeJoinAttributes = NULL;
}
// get the next left child
if((rc = _pLc->GetNext(_nJoinAttributes, _nodeJoinAttributes, _pJoinData)))
{
if(right_pData != NULL)
{
delete[] right_pData;
right_nodeAttributes = NULL;
}
return rc;
}
}
else
{
// check the join condition
int left_index, right_index;
if((rc = IsAttributeInList(_nJoinAttributes, _nodeJoinAttributes, _operationAttributes[0], left_index)))
return rc;
if((rc = IsAttributeInList(right_nAttributes, right_nodeAttributes, _operationAttributes[1], right_index)))
return rc;
switch (_operationAttributes[0].attrType)
{
case INT:
int tempLeft, tempRight;
memcpy(&tempLeft, _pJoinData+_nodeJoinAttributes[left_index].offset, sizeof(int));
memcpy(&tempRight, right_pData+right_nodeAttributes[right_index].offset, sizeof(int));
joinCondition = tempLeft == tempRight;
break;
case FLOAT:
float fTempLeft, fTempRight;
memcpy(&fTempLeft, _pJoinData+_nodeJoinAttributes[left_index].offset, sizeof(float));
memcpy(&fTempRight, right_pData+right_nodeAttributes[right_index].offset, sizeof(float));
joinCondition = fTempLeft == fTempRight;
break;
case STRING:
char sTempLeft[MAXSTRINGLEN], sTempRight[MAXSTRINGLEN];
strcpy(sTempLeft, _pJoinData+_nodeJoinAttributes[left_index].offset);
strcpy(sTempRight, right_pData+right_nodeAttributes[right_index].offset);
joinCondition = strcmp(sTempLeft,sTempRight) == 0;
break;
default:
break;
}
}
}
// create the output buffer
pData = new char[_bufferSize];
// copy the required attributes in the output buffer
for(int i=0; i<_nJoinAttributes; i++)
{
if((rc = IsAttributeInList(_nNodeAttributes, _nodeAttributes, _nodeJoinAttributes[i], index)))
return rc;
if(index >= 0)
{
memcpy(pData + _nodeAttributes[index].offset,
_pJoinData + _nodeJoinAttributes[i].offset,
_nodeJoinAttributes[i].attrLength);
}
}
for(int i=0; i<right_nAttributes; i++)
{
if((rc = IsAttributeInList(_nNodeAttributes, _nodeAttributes, right_nodeAttributes[i], index)))
return rc;
if(index >= 0)
{
memcpy(pData + _nodeAttributes[index].offset,
right_pData + right_nodeAttributes[i].offset,
right_nodeAttributes[i].attrLength);
}
}
// assign the output vars
nAttributes = _nNodeAttributes;
tNodeAttributes = _nodeAttributes;
// delete the children buffers
if(right_pData != NULL)
{
delete[] right_pData;
right_pData = NULL;
}
return rc;
}
RC QL_TreePlan::PerformSelect(int &nAttributes, DataAttrInfo *&tNodeAttributes, char * &pData)
{
RC rc = OK_RC;
// need to open scan
if(_scanStatus == SCANCLOSED)
{
// with conditions
if(_conditions.size()>0)