本文整理汇总了C++中Scan::getSelectionPredicates方法的典型用法代码示例。如果您正苦于以下问题：C++ Scan::getSelectionPredicates方法的具体用法？C++ Scan::getSelectionPredicates怎么用？C++ Scan::getSelectionPredicates使用的例子？那么恭喜您, 这里精选的方法代码示例或许可以为您提供帮助。您也可以进一步了解该方法所在类Scan的用法示例。
在下文中一共展示了Scan::getSelectionPredicates方法的1个代码示例，这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞，您的评价将有助于系统推荐出更棒的C++代码示例。
示例1: setupASMCacheForJBB
// AppliedStatMan::setupASMCacheForJBB method will be called from
// Query::Analyze after connectivity analysis has been done and
// empty logical properties have been set.
void AppliedStatMan::setupASMCacheForJBB(JBB & jbb)
{
EstLogPropSharedPtr myEstLogProp;
// get all JBBCs of JBB
const CANodeIdSet jbbcNodeIdSet = jbb.getMainJBBSubset().getJBBCs();
CANodeId jbbcId;
// for all jbbcs
for (jbbcId = jbbcNodeIdSet.init();
jbbcNodeIdSet.next(jbbcId);
jbbcNodeIdSet.advance(jbbcId))
{
if (NodeAnalysis * jbbcNode = jbbcId.getNodeAnalysis())
{
// Evaluate local predicates only if it is a table.
RelExpr * jbbcExpr = jbbcNode->getOriginalExpr();
if ((jbbcNode->getTableAnalysis() != NULL) &&
(jbbcExpr->getOperatorType() == REL_SCAN))
{
// get the original expression of the jbbc
Scan * scanExpr = (Scan *) jbbcExpr;
ValueIdSet localPreds = scanExpr->getSelectionPredicates();
// if local predicates have already been computed, then skip
if ((localPreds.entries() > 0) || !(lookup(jbbcId)))
{
// check to see this GA has already been associated with
// a logExpr for synthesis. If not, then synthesize
// log. expression, and then apply local predicates to it
if (NOT scanExpr->getGroupAttr()->existsLogExprForSynthesis())
scanExpr->synthLogProp();
myEstLogProp = getStatsForCANodeId(jbbcId);
}
}
}
}
// Now do a second traversal of the JBB looking for join reducers
for (jbbcId = jbbcNodeIdSet.init();
jbbcNodeIdSet.next(jbbcId);
jbbcNodeIdSet.advance(jbbcId))
{
// now look for all two way joins for this child
if (jbbcId.getNodeAnalysis())
{
// get all JBBCs connected to this JBBC, and do a two-way
// join with all of them
CANodeIdSet connectedNodes = jbbcId.getNodeAnalysis()->\
getJBBC()->getJoinedJBBCs();
for (CANodeId connectedTable = connectedNodes.init();
connectedNodes.next(connectedTable);
connectedNodes.advance(connectedTable))
{
if (connectedTable.getNodeAnalysis())
{
// ASM does not concern itself with the order of the tables,
// hence it is possible that the join has already been computed
CANodeIdSet tableSet = jbbcId;
tableSet.insert(connectedTable);
if ((myEstLogProp = getCachedStatistics(&tableSet)) == NULL)
{
CANodeIdSet setForjbbcId(jbbcId);
CANodeIdSet setForConnectedTable(connectedTable);
myEstLogProp = joinJBBChildren(setForjbbcId, setForConnectedTable);
}
}
}
}
}
} // AppliedStatMan::setupASMCacheForJBB