本文整理汇总了C++中ValueIdList::rebuildExprTree方法的典型用法代码示例。如果您正苦于以下问题：C++ ValueIdList::rebuildExprTree方法的具体用法？C++ ValueIdList::rebuildExprTree怎么用？C++ ValueIdList::rebuildExprTree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ValueIdList的用法示例。
在下文中一共展示了ValueIdList::rebuildExprTree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: codeGen
short ProbeCache::codeGen(Generator *generator)
{
ExpGenerator * exp_gen = generator->getExpGenerator();
Space * space = generator->getSpace();
MapTable * last_map_table = generator->getLastMapTable();
ex_cri_desc * given_desc
= generator->getCriDesc(Generator::DOWN);
ex_cri_desc * returned_desc
= new(space) ex_cri_desc(given_desc->noTuples() + 1, space);
// cri descriptor for work atp has 5 entries:
// entry #0 for const
// entry #1 for temp
// entry #2 for hash value of probe input data in Probe Cache Manager
// entry #3 for encoded probe input data in Probe Cache Manager
// enrry #4 for inner table row data in this operator's cache buffer
Int32 work_atp = 1;
ex_cri_desc * work_cri_desc = new(space) ex_cri_desc(5, space);
unsigned short hashValIdx = 2;
unsigned short encodedProbeDataIdx = 3;
unsigned short innerRowDataIdx = 4;
// generate code for child tree, and get its tdb and explain tuple.
child(0)->codeGen(generator);
ComTdb * child_tdb = (ComTdb *)(generator->getGenObj());
ExplainTuple *childExplainTuple = generator->getExplainTuple();
//////////////////////////////////////////////////////
// Generate up to 4 runtime expressions.
//////////////////////////////////////////////////////
// Will use child's char. inputs (+ execution count) for the next
// two runtime expressions.
ValueIdList inputsToUse = child(0).getGroupAttr()->getCharacteristicInputs();
inputsToUse.insert(generator->getOrAddStatementExecutionCount());
// Expression #1 gets the hash value of the probe input data
ValueIdList hvAsList;
// Executor has hard-coded assumption that the result is long,
// so add a Cast node to convert result to a long.
ItemExpr *probeHashAsIe = new (generator->wHeap())
HashDistPartHash(inputsToUse.rebuildExprTree(ITM_ITEM_LIST));
probeHashAsIe->bindNode(generator->getBindWA());
NumericType &nTyp = (NumericType &)probeHashAsIe->getValueId().getType();
GenAssert(nTyp.isSigned() == FALSE,
"Unexpected signed HashDistPartHash.");
GenAssert(probeHashAsIe->getValueId().getType().supportsSQLnullLogical()
== FALSE, "Unexpected nullable HashDistPartHash.");
ItemExpr *hvAsIe = new (generator->wHeap()) Cast(
probeHashAsIe,
new (generator->wHeap())
SQLInt(FALSE, // false == unsigned.
FALSE // false == not nullable.
));
hvAsIe->bindNode(generator->getBindWA());
hvAsList.insert(hvAsIe->getValueId());
ex_expr *hvExpr = NULL;
ULng32 hvLength;
exp_gen->generateContiguousMoveExpr(
hvAsList,
0, // don't add convert node
work_atp,
hashValIdx,
ExpTupleDesc::SQLARK_EXPLODED_FORMAT,
hvLength,
&hvExpr);
GenAssert(hvLength == sizeof(Lng32),
"Unexpected length of result of hash function.");
// Expression #2 encodes the probe input data for storage in
// the ProbeCacheManager.
ValueIdList encodeInputAsList;
CollIndex inputListIndex;
for (inputListIndex = 0;
inputListIndex < inputsToUse.entries();
inputListIndex++) {
ItemExpr *inputIe =
(inputsToUse[inputListIndex].getValueDesc())->getItemExpr();
if (inputIe->getValueId().getType().getVarLenHdrSize() > 0)
{
// This logic copied from Sort::codeGen().
//.........这里部分代码省略.........