def getSafeQueryPlan(self, init=True):
# we are interested in whether the separator represents
# a generic inequality constraint - if so, it doesn't matter which
# component it occurs in, as it must have the same
# constraint everywhere
representativeSeparator = self.separator[0]
if representativeSeparator.isInequality() and representativeSeparator.getInequalityConstraint().isGeneric():
self.replacementVal = "generic_%s" % representativeSeparator.getInequalityConstraint().getConstant()
else:
self.replacementVal = algorithm.attCounter()
# for webkb
if representativeSeparator.domainSize:
self.effectiveDomainSize = representativeSeparator.domainSize
d = self.disjunctiveQuery
self.usedSeparatorVars = d.getUsedSeparators()
d.applySeparator(self.separator, self.replacementVal)
if isinstance(d, query_exp.DisjunctiveQuery):
cons = []
for c in d.getComponents():
cons.append(query_exp.ConjunctiveQuery(query_exp.decomposeComponent(c)))
self.childDNF = query_exp.DNF(cons)
else:
self.childDNF = d
if init:
self.child = algorithm.getSafeOpenQueryPlanNaive(self.childDNF)
symbolString = str(algorithm.dom) + "_" + str(representativeSeparator)
self.lam = symbols(symbolString)* self.child.lam
else:
self.child = None
def generateSQL_DNF(self, separatorSubs=None):
#print separatorSubs
if separatorSubs is None:
separatorSubs = []
replacementVal = algorithm.attCounter()
groupBy = ["c%d" % i for (i, x) in separatorSubs]
if len(groupBy):
groupByString = 'group by ' + ', '.join(groupBy)
else:
groupByString = ''
selectString = ', '.join(groupBy + ["l_ior_n(COALESCE(pUse,0))"])
separatorSubs.append((self.replacementVal, self.separator))
childSQL = self.child.generateSQL_DNF(separatorSubs[:])
sql = "\n select %s as pUse from (%s\n) as q%d \n %s \n" % (selectString, childSQL, algorithm.counter(), groupByString)
if self.child.hasGenericConstant():
genericConstantStr = self.child.getGenericConstantStr()
self.genericConstantStr = genericConstantStr
groupBy.append(genericConstantStr)
groupByString = 'group by ' + ', '.join(groupBy)
sql = "\n select %s, %s as pUse from (%s\n) as q%d \n %s \n" % (genericConstantStr, selectString, childSQL, algorithm.counter(), groupByString)
else:
#Ground Tuple: self.child.groundTuple.name
add_line = ','.join(groupBy + ["pUse + <%s> * (<%s_%s> - ct ) as pUse" % (self.child.lam, algorithm.dom, separatorSubs[-1][1][0])])
sql = "\n select %s from (\n select %s as pUse, count(*) as ct from (%s\n) as q%d \n %s \n) as q%d \n" % (add_line, selectString, childSQL, algorithm.counter(), groupByString, algorithm.counter())
return sql
def generateSQL_DNF(self, separatorSubs=None):
if separatorSubs is None:
separatorSubs = []
replacementVal = algorithm.attCounter()
groupBy = ["c%d" % i for (i, x) in separatorSubs]
if len(groupBy):
groupByString = 'group by ' + ', '.join(groupBy)
else:
groupByString = ''
selectString = ', '.join(groupBy + ['ior(COALESCE(pUse,0))'])
separatorSubs.append((self.replacementVal, self.separator))
childSQL = self.child.generateSQL_DNF(separatorSubs[:])
sql = "\n -- independent project \n select %s as pUse from (%s) as q%d %s " % (
selectString, childSQL, algorithm.counter(), groupByString)
if self.child.hasGenericConstant():
genericConstantStr = self.child.getGenericConstantStr()
self.genericConstantStr = genericConstantStr
groupBy.append(genericConstantStr)
groupByString = 'group by ' + ', '.join(groupBy)
sql = "\n -- independent project \n select %s, %s as pUse from (%s) as q%d %s " % (
genericConstantStr, selectString, childSQL,
algorithm.counter(), groupByString)
else:
sql = "\n -- independent project \n select %s as pUse from (%s) as q%d %s " % (
selectString, childSQL, algorithm.counter(), groupByString)
return sql
def generateSQL_DNF(self, separatorSubs=None):
if separatorSubs is None:
separatorSubs = []
replacementVal = algorithm.attCounter()
groupBy = ["c%d" % i for (i, x) in separatorSubs]
if len(groupBy):
groupByString = 'group by ' + ', '.join(groupBy)
else:
groupByString = ''
selectString = ', '.join(groupBy + ['ior(COALESCE(pUse,0))'])
separatorSubs.append((self.replacementVal, self.separator))
childSQL = self.child.generateSQL_DNF(separatorSubs[:])
sql = "\n -- independent project \n select %s as pUse from (%s) as q%d %s " % (
selectString, childSQL, algorithm.counter(), groupByString)
if self.child.hasGenericConstant():
genericConstantStr = self.child.getGenericConstantStr()
self.genericConstantStr = genericConstantStr
groupBy.append(genericConstantStr)
groupByString = 'group by ' + ', '.join(groupBy)
sql = "\n -- independent project \n select %s, %s as pUse from (%s) as q%d %s " % (
genericConstantStr, selectString, childSQL, algorithm.counter(), groupByString)
else:
sql = "\n -- independent project \n select %s as pUse from (%s) as q%d %s " % (
selectString, childSQL, algorithm.counter(), groupByString)
return sql
def getSafeQueryPlan(self, init=True):
# we are interested in whether the separator represents
# a generic inequality constraint - if so, it doesn't matter which
# component it occurs in, as it must have the same
# constraint everywhere
representativeSeparator = self.separator[0]
if representativeSeparator.isInequality(
) and representativeSeparator.getInequalityConstraint().isGeneric():
self.replacementVal = "generic_%s" % representativeSeparator.getInequalityConstraint(
).getConstant()
else:
self.replacementVal = algorithm.attCounter()
# for webkb
if representativeSeparator.domainSize:
self.effectiveDomainSize = representativeSeparator.domainSize
d = self.disjunctiveQuery
self.usedSeparatorVars = d.getUsedSeparators()
d.applySeparator(self.separator, self.replacementVal)
if isinstance(d, query_exp.DisjunctiveQuery):
cons = []
for c in d.getComponents():
cons.append(
query_exp.ConjunctiveQuery(
query_exp.decomposeComponent(c)))
self.childDNF = query_exp.DNF(cons)
else:
self.childDNF = d
if init:
self.child = algorithm.getSafeQueryPlan(self.childDNF)
else:
self.child = None
def generateSQL_CNF(self, params):
replacementVal = algorithm.attCounter()
childSQL = self.child.generateSQL_CNF(params)
self.trueOnMissing = self.child.trueOnMissing
self.genericIdentifiers = self.child.genericIdentifiers.copy()
subqueryAlias = 'q%d' % algorithm.counter()
# this steps replaces a universally (\forall) quantified variable
# with a product - if some tuples can be missing, we need to count
# and invalidate any products with too few terms (missing terms =
# false terms)
if params['missingTuples']:
# for webkb
if self.effectiveDomainSize:
effectiveDomainSize = self.effectiveDomainSize
else:
effectiveDomainSize = params['domainSize']
if self.isInequalityVar(self.separator):
effectiveDomainSize = effectiveDomainSize - 1
groupByAttributes = []
selectAttributes = []
joinClause = ''
# take care of generic constants, which have been projected out but
# must still be "bubbled up" to the previous level
for genericIdentifier in self.genericIdentifiers:
groupByAttributes.append(genericIdentifier)
selectAttributes.append(genericIdentifier)
if self.isGenericInequalityVar(self.separator):
genericConstantIdentifier = "sep_var_%s" % str(self.replacementVal)
selectAttributes.append('A.v0 as %s' % genericConstantIdentifier)
joinClause = ', A WHERE A.v0 != %s.%s' % (subqueryAlias, genericConstantIdentifier)
groupByAttributes.append('A.v0')
self.genericIdentifiers.add(genericConstantIdentifier)
for storedReplacementVal in self.usedSeparatorVars:
selectAttributes.append("sep_var_%s" % str(storedReplacementVal))
groupByAttributes.append("sep_var_%s" % str(storedReplacementVal))
if len(groupByAttributes):
groupByClause = 'group by ' + (', ' . join(groupByAttributes))
else:
groupByClause = ''
havingClause = ''
if params['useLog']:
if self.trueOnMissing:
if params['useNull']:
selectAttributes.append('CASE WHEN COUNT(*) = COUNT(pUse) THEN SUM(pUse) ELSE NULL END AS pUse')
# if the result is empty and trueOnMissing=True, we should
# return empty set (true)
havingClause = ' HAVING COUNT(*) > 0'
else:
selectAttributes.append('SUM(pUse) AS pUse')
else:
if params['useNull']:
if params['missingTuples']:
selectAttributes.append('CASE WHEN COUNT(*) = COUNT(pUse) and COUNT(*) = %d THEN SUM(pUse) ELSE NULL END AS pUse' % effectiveDomainSize)
else:
selectAttributes.append('CASE WHEN COUNT(*) = COUNT(pUse) THEN SUM(pUse) ELSE NULL END AS pUse')
else:
if params['missingTuples']:
selectAttributes.append("CASE WHEN COUNT(*) = %d THEN SUM(pUse) ELSE '-Infinity' END AS pUse" % effectiveDomainSize)
else:
selectAttributes.append('SUM(pUse) AS pUse')
else:
if not self.trueOnMissing and params['missingTuples']:
selectAttributes.append("CASE WHEN COUNT(*) = %d THEN prod_double(pUse) ELSE 0 END AS pUse" % effectiveDomainSize)
else:
selectAttributes.append('prod_double(pUse) AS pUse')
selectClause = ', '.join(selectAttributes)
sql = "\n select %s from (%s) as %s%s %s %s" % (selectClause, childSQL, subqueryAlias, joinClause, groupByClause, havingClause)
return sql
def generateSQL_CNF(self, params):
replacementVal = algorithm.attCounter()
childSQL = self.child.generateSQL_CNF(params)
self.trueOnMissing = self.child.trueOnMissing
self.genericIdentifiers = self.child.genericIdentifiers.copy()
subqueryAlias = 'q%d' % algorithm.counter()
# this steps replaces a universally (\forall) quantified variable
# with a product - if some tuples can be missing, we need to count
# and invalidate any products with too few terms (missing terms =
# false terms)
if params['missingTuples']:
# for webkb
if self.effectiveDomainSize:
effectiveDomainSize = self.effectiveDomainSize
else:
effectiveDomainSize = params['domainSize']
if self.isInequalityVar(self.separator):
effectiveDomainSize = effectiveDomainSize - 1
groupByAttributes = []
selectAttributes = []
joinClause = ''
# take care of generic constants, which have been projected out but
# must still be "bubbled up" to the previous level
for genericIdentifier in self.genericIdentifiers:
groupByAttributes.append(genericIdentifier)
selectAttributes.append(genericIdentifier)
if self.isGenericInequalityVar(self.separator):
genericConstantIdentifier = "sep_var_%s" % str(self.replacementVal)
selectAttributes.append('A.v0 as %s' % genericConstantIdentifier)
joinClause = ', A WHERE A.v0 != %s.%s' % (
subqueryAlias, genericConstantIdentifier)
groupByAttributes.append('A.v0')
self.genericIdentifiers.add(genericConstantIdentifier)
for storedReplacementVal in self.usedSeparatorVars:
selectAttributes.append("sep_var_%s" % str(storedReplacementVal))
groupByAttributes.append("sep_var_%s" % str(storedReplacementVal))
if len(groupByAttributes):
groupByClause = 'group by ' + (', ' . join(groupByAttributes))
else:
groupByClause = ''
havingClause = ''
if params['useLog']:
if self.trueOnMissing:
if params['useNull']:
selectAttributes.append(
'CASE WHEN COUNT(*) = COUNT(pUse) THEN SUM(pUse) ELSE NULL END AS pUse')
# if the result is empty and trueOnMissing=True, we should
# return empty set (true)
havingClause = ' HAVING COUNT(*) > 0'
else:
selectAttributes.append('SUM(pUse) AS pUse')
else:
if params['useNull']:
if params['missingTuples']:
selectAttributes.append(
'CASE WHEN COUNT(*) = COUNT(pUse) and COUNT(*) = %d THEN SUM(pUse) ELSE NULL END AS pUse' %
effectiveDomainSize)
else:
selectAttributes.append(
'CASE WHEN COUNT(*) = COUNT(pUse) THEN SUM(pUse) ELSE NULL END AS pUse')
else:
if params['missingTuples']:
selectAttributes.append(
"CASE WHEN COUNT(*) = %d THEN SUM(pUse) ELSE '-Infinity' END AS pUse" %
effectiveDomainSize)
else:
selectAttributes.append('SUM(pUse) AS pUse')
else:
if not self.trueOnMissing and params['missingTuples']:
selectAttributes.append(
"CASE WHEN COUNT(*) = %d THEN prod_double(pUse) ELSE 0 END AS pUse" %
effectiveDomainSize)
else:
selectAttributes.append('prod_double(pUse) AS pUse')
selectClause = ', '.join(selectAttributes)
sql = "\n -- independent project \n select %s from (%s) as %s%s %s %s" % (
selectClause, childSQL, subqueryAlias, joinClause, groupByClause, havingClause)
return sql
