本文整理汇总了C++中CDistributionSpec::FSatisfies方法的典型用法代码示例。如果您正苦于以下问题：C++ CDistributionSpec::FSatisfies方法的具体用法？C++ CDistributionSpec::FSatisfies怎么用？C++ CDistributionSpec::FSatisfies使用的例子？那么, 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CDistributionSpec的用法示例。
在下文中一共展示了CDistributionSpec::FSatisfies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: PdrgpulMap
//---------------------------------------------------------------------------
// @function:
// CPhysicalUnionAll::PdshashedDerive
//
// @doc:
// Derive hashed distribution from child hashed distributions
//
//---------------------------------------------------------------------------
CDistributionSpecHashed *
CPhysicalUnionAll::PdshashedDerive
(
IMemoryPool *mp,
CExpressionHandle &exprhdl
)
const
{
BOOL fSuccess = true;
const ULONG arity = exprhdl.Arity();
// (1) check that all children deliver a hashed distribution that satisfies their input columns
for (ULONG ulChild = 0; fSuccess && ulChild < arity; ulChild++)
{
CDistributionSpec *pdsChild = exprhdl.Pdpplan(ulChild)->Pds();
CDistributionSpec::EDistributionType edtChild = pdsChild->Edt();
fSuccess = (CDistributionSpec::EdtHashed == edtChild || CDistributionSpec::EdtHashedNoOp == edtChild || CDistributionSpec::EdtStrictHashed == edtChild)
&& pdsChild->FSatisfies((*m_pdrgpds)[ulChild]);
}
if (!fSuccess)
{
// a child does not deliver hashed distribution
return NULL;
}
// (2) check that child hashed distributions map to the same output columns
// map outer child hashed distribution to corresponding UnionAll column positions
ULongPtrArray *pdrgpulOuter = PdrgpulMap(mp, CDistributionSpecHashed::PdsConvert(exprhdl.Pdpplan(0 /*child_index*/)->Pds())->Pdrgpexpr(), 0/*child_index*/);
if (NULL == pdrgpulOuter)
{
return NULL;
}
ULongPtrArray *pdrgpulChild = NULL;
for (ULONG ulChild = 1; fSuccess && ulChild < arity; ulChild++)
{
pdrgpulChild = PdrgpulMap(mp, CDistributionSpecHashed::PdsConvert(exprhdl.Pdpplan(ulChild)->Pds())->Pdrgpexpr(), ulChild);
// match mapped column positions of current child with outer child
fSuccess = (NULL != pdrgpulChild) && Equals(pdrgpulOuter, pdrgpulChild);
CRefCount::SafeRelease(pdrgpulChild);
}
CDistributionSpecHashed *pdsOutput = NULL;
if (fSuccess)
{
pdsOutput = PdsMatching(mp, pdrgpulOuter);
}
pdrgpulOuter->Release();
return pdsOutput;
}