// This method forms the join expression for join on JBBC specified by jbbcId
// inputEstLogProp should not be cacheable
Join * AppliedStatMan::formJoinExprForJoinOnJBBC(
CANodeIdSet jbbSubset,
CANodeId jbbcId,
const ValueIdSet * jbbcLocalPreds,
const ValueIdSet * joinPreds,
const EstLogPropSharedPtr& inputEstLogProp,
const NABoolean cacheable)
{
NABoolean origInputIsCacheable = inputEstLogProp->isCacheable();
if(origInputIsCacheable)
{
inputEstLogProp->setCacheableFlag(FALSE);
CCMPASSERT("Expecting Non Cacheable Input");
}
RelExpr * jbbcExpr = getExprForCANodeId(jbbcId, inputEstLogProp, jbbcLocalPreds);
jbbcExpr->getGroupAttr()->outputLogProp(inputEstLogProp);
RelExpr * jbbSubsetExpr = jbbSubset.jbbcsToJBBSubset()->getPreferredJoin();
if(!jbbSubsetExpr)
if(jbbSubset.entries()==1)
if(!inputEstLogProp->isCacheable())
{
inputEstLogProp->setCacheableFlag(TRUE);
jbbSubsetExpr = getExprForCANodeId(jbbSubset.getFirst(), inputEstLogProp);
inputEstLogProp->setCacheableFlag(FALSE);
}
else
jbbSubsetExpr = getExprForCANodeId(jbbSubset.getFirst(), inputEstLogProp);
else
{
CCMPASSERT("No Subset expression, need at least one entry in set");
}
RelExpr * leftChildExpr = jbbSubsetExpr;
RelExpr * rightChildExpr = jbbcExpr;
GroupAttributes * galeft = jbbSubsetExpr->getGroupAttr();
GroupAttributes * garight = jbbcExpr->getGroupAttr();
// xxx
JBBC * jbbc = jbbcId.getNodeAnalysis()->getJBBC();
Join * jbbcParentJoin = jbbc->getOriginalParentJoin();
ValueIdSet leftOuterJoinFilterPreds;
Join * joinExpr = NULL;
if(jbbcParentJoin)
{
if(jbbcParentJoin->isSemiJoin())
joinExpr = new STMTHEAP Join(leftChildExpr, rightChildExpr, REL_SEMIJOIN, NULL);
if(jbbcParentJoin->isAntiSemiJoin())
joinExpr = new STMTHEAP Join(leftChildExpr, rightChildExpr, REL_ANTI_SEMIJOIN, NULL);
if(jbbcParentJoin->isLeftJoin())
{
joinExpr = new STMTHEAP Join(leftChildExpr, rightChildExpr, REL_LEFT_JOIN, NULL);
leftOuterJoinFilterPreds += jbbc->getLeftJoinFilterPreds();
}
if(joinExpr)
{
joinExpr->setJoinPred(jbbc->getPredsWithPredecessors());
joinExpr->nullInstantiatedOutput().insert(jbbc->nullInstantiatedOutput());
}
}
if(!joinExpr)
{
// now form a JoinExpr with these left and right children.
joinExpr = new STMTHEAP Join(leftChildExpr, rightChildExpr, REL_JOIN, NULL);
}
ValueIdSet selPredsAndLOJFilter = leftOuterJoinFilterPreds;
selPredsAndLOJFilter += (*joinPreds);
joinExpr->setSelectionPredicates(selPredsAndLOJFilter);
// set groupAttr of this Join expression
GroupAttributes * gaJoin = new STMTHEAP GroupAttributes();
// set required outputs of Join as sum of characteristic
// outputs of the left and the right children
ValueIdSet requiredOutputs;
requiredOutputs.addSet(getPotentialOutputs(jbbSubset));
requiredOutputs.addSet(getPotentialOutputs(jbbcId));
gaJoin->setCharacteristicOutputs(requiredOutputs);
// set JBBSubset for this group, if all estLogProps are cacheable.
// Else JBBSubset is NULL
CANodeIdSet combinedSet = jbbSubset;
combinedSet += jbbcId;
if (cacheable)
gaJoin->getGroupAnalysis()->setLocalJBBView(combinedSet.jbbcsToJBBSubset());
gaJoin->setMinChildEstRowCount(MINOF(garight->getMinChildEstRowCount(), galeft->getMinChildEstRowCount() ) );
// if there are some probes coming into the join
// then join type = tsj.
if ((inputEstLogProp->getResultCardinality() > 1) ||
(inputEstLogProp->getColStats().entries() > 1))
{
if (cacheable)
{
CANodeIdSet inputNodeSet = *(inputEstLogProp->getNodeSet());
gaJoin->setCharacteristicInputs(getPotentialOutputs(inputNodeSet));
}
}
joinExpr->setGroupAttr(gaJoin);
gaJoin->setLogExprForSynthesis(joinExpr);
joinExpr->synthLogProp();
inputEstLogProp->setCacheableFlag(origInputIsCacheable);
return joinExpr;
} // AppliedStatMan::formJoinExprForJoinOnJBBC
EstLogPropSharedPtr AppliedStatMan::getStatsForCANodeId(
CANodeId jbbc,
const EstLogPropSharedPtr &inLP,
const ValueIdSet * predIdSet)
{
EstLogPropSharedPtr inputLP = inLP;
if(inputLP == (*GLOBAL_EMPTY_INPUT_LOGPROP))
inputLP = jbbc.getJBBInput();
EstLogPropSharedPtr outputEstLogProp = NULL;
// 1. Try to find Logical Properties from cache if cacheable.
// The estimate Logical Properties can be cacheable if all local
// predicates are to be applied and if inNodeSet is provided,
// or the inLP are cacheable
if ((inputLP->isCacheable()) && (predIdSet == NULL) )
{
CANodeIdSet combinedSet = jbbc;
// get the nodeIdSet of the outer child, if not already given. This
// along with the present jbbc is used as a key in the cache
CANodeIdSet * inputNodeSet;
inputNodeSet = inputLP->getNodeSet();
// if inLP are cacheable these should have a nodeSet attached
CCMPASSERT(inputNodeSet != NULL);
if (inputNodeSet)
{
combinedSet.insert(*inputNodeSet);
// if estLogProp for all local predicates is required,
// then it might already exist in the cache
outputEstLogProp = getCachedStatistics(&combinedSet);
}
}
if (outputEstLogProp == NULL)
{
// 2. properties do not exist in the cache, so synthesize them.
//if specified by the user apply those predicates,
// else apply predicates in the original expr
NodeAnalysis * jbbcNode = jbbc.getNodeAnalysis();
TableAnalysis * tableAnalysis = jbbcNode->getTableAnalysis();
if (tableAnalysis && predIdSet)
{
TableDesc * tableDesc = tableAnalysis->getTableDesc();
const QualifiedName& qualName =
tableDesc->getNATable()->getTableName();
CorrName name(qualName, STMTHEAP);
Scan *scanExpr = new STMTHEAP Scan(name, tableDesc, REL_SCAN, STMTHEAP);
Cardinality rc = tableDesc->getNATable()->getEstRowCount();
const CardinalityHint* cardHint = tableDesc->getCardinalityHint();
if ( cardHint )
rc = (cardHint->getScanCardinality()).getValue();
if ( !cardHint && tableDesc->getNATable()->isHbaseTable() ) {
NATable* nt = (NATable*)(tableDesc->getNATable());
StatsList* statsList = nt->getColStats();
if ( statsList && statsList->entries() > 0 ) {
ColStatsSharedPtr cStatsPtr =
statsList->getSingleColumnColStats(0);
if ( cStatsPtr )
rc = (cStatsPtr->getRowcount()).getValue();
}
}
scanExpr->setBaseCardinality(MIN_ONE (rc));
GroupAttributes * gaExpr = new STMTHEAP GroupAttributes();
scanExpr->setSelectionPredicates(*predIdSet);
ValueIdSet requiredOutputs = jbbc.getNodeAnalysis()->\
getOriginalExpr()->getGroupAttr()->getCharacteristicOutputs();
gaExpr->setCharacteristicOutputs(requiredOutputs);
scanExpr->setGroupAttr(gaExpr);
gaExpr->setLogExprForSynthesis(scanExpr);
EstLogPropSharedPtr nonCacheableInLP(new (HISTHEAP) EstLogProp (*inputLP));
nonCacheableInLP->setCacheableFlag(FALSE);
scanExpr->synthLogProp();
outputEstLogProp = scanExpr->getGroupAttr()->outputLogProp(nonCacheableInLP);
}
else
{
NodeAnalysis * nodeAnalysis = jbbc.getNodeAnalysis();
RelExpr * relExpr = nodeAnalysis->getModifiedExpr();
if (relExpr == NULL)
relExpr = nodeAnalysis->getOriginalExpr();
// synthesize and cache estLogProp for the given inLP.
outputEstLogProp = relExpr->getGroupAttr()->outputLogProp(inputLP);
}
}
return outputEstLogProp;
} // getStatsForCANodeId
