本文整理汇总了C++中CExpressionHandle::FHasOuterRefs方法的典型用法代码示例。如果您正苦于以下问题：C++ CExpressionHandle::FHasOuterRefs方法的具体用法？C++ CExpressionHandle::FHasOuterRefs怎么用？C++ CExpressionHandle::FHasOuterRefs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CExpressionHandle的用法示例。
在下文中一共展示了CExpressionHandle::FHasOuterRefs方法的6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:
//---------------------------------------------------------------------------
// @function:
// CPhysicalComputeScalar::EpetDistribution
//
// @doc:
// Return the enforcing type for distribution property based on this operator
//
//---------------------------------------------------------------------------
CEnfdProp::EPropEnforcingType
CPhysicalComputeScalar::EpetDistribution
(
CExpressionHandle &exprhdl,
const CEnfdDistribution *ped
)
const
{
GPOS_ASSERT(NULL != ped);
// get distribution delivered by the filter node
CDistributionSpec *pds = CDrvdPropPlan::Pdpplan(exprhdl.Pdp())->Pds();
if (ped->FCompatible(pds))
{
// required distribution is already provided
return CEnfdProp::EpetUnnecessary;
}
if (exprhdl.FHasOuterRefs())
{
return CEnfdProp::EpetProhibited;
}
return CEnfdProp::EpetRequired;
}示例2:
//---------------------------------------------------------------------------
// @function:
// CPhysicalAgg::EpetDistribution
//
// @doc:
// Return the enforcing type for distribution property based on this operator
//
//---------------------------------------------------------------------------
CEnfdProp::EPropEnforcingType
CPhysicalAgg::EpetDistribution
(
CExpressionHandle &exprhdl,
const CEnfdDistribution *ped
)
const
{
GPOS_ASSERT(NULL != ped);
// get distribution delivered by the aggregate node
CDistributionSpec *pds = CDrvdPropPlan::Pdpplan(exprhdl.Pdp())->Pds();
if (ped->FCompatible(pds))
{
if (COperator::EgbaggtypeLocal != Egbaggtype())
{
return CEnfdProp::EpetUnnecessary;
}
// prohibit the plan if local aggregate already delivers the enforced distribution, since
// otherwise we would create two aggregates with no intermediate motion operators
return CEnfdProp::EpetProhibited;
}
// if there are outer refs, we cannot have a motion on top
if (exprhdl.FHasOuterRefs())
{
return CEnfdProp::EpetProhibited;
}
// required distribution will be enforced on Agg's output
return CEnfdProp::EpetRequired;
}示例3:
//---------------------------------------------------------------------------
// @function:
// CXformLeftAntiSemiApply2LeftAntiSemiJoin::Exfp
//
// @doc:
// Compute xform promise for a given expression handle;
// outer references are not allowed
//
//---------------------------------------------------------------------------
CXform::EXformPromise
CXformLeftAntiSemiApply2LeftAntiSemiJoin::Exfp
(
CExpressionHandle &exprhdl
)
const
{
// if there are outer refs that include columns from the immediate outer child, the
// transformation is applicable
if (exprhdl.FHasOuterRefs(1 /*ulChildIndex*/) && !CUtils::FInnerUsesExternalColsOnly(exprhdl))
{
return CXform::ExfpHigh;
}
return CXform::ExfpNone;
}示例4:
//---------------------------------------------------------------------------
// @function:
// CXformLeftAntiSemiApply2LeftAntiSemiJoinNoCorrelations::Exfp
//
// @doc:
// Compute xform promise for a given expression handle;
// outer references are not allowed
//
//---------------------------------------------------------------------------
CXform::EXformPromise
CXformLeftAntiSemiApply2LeftAntiSemiJoinNoCorrelations::Exfp
(
CExpressionHandle &exprhdl
)
const
{
// if there are no outer references, or if all outer refs do not reference outer
// child, the transformation is applicable
if (!exprhdl.FHasOuterRefs(1 /*ulChildIndex*/) || CUtils::FInnerUsesExternalColsOnly(exprhdl))
{
return CXform::ExfpHigh;
}
return CXform::ExfpNone;
}开发者ID:MoZhonghua，项目名称:gporca，代码行数:25，代码来源:CXformLeftAntiSemiApply2LeftAntiSemiJoinNoCorrelations.cpp
示例5:
//---------------------------------------------------------------------------
// @function:
// CPhysicalMotion::EpetRewindability
//
// @doc:
// Return rewindability property enforcing type for this operator
//
//---------------------------------------------------------------------------
CEnfdProp::EPropEnforcingType
CPhysicalMotion::EpetRewindability
(
CExpressionHandle &exprhdl,
const CEnfdRewindability * // per
)
const
{
if (exprhdl.FHasOuterRefs())
{
// motion has outer references: prohibit this plan
// Note: this is a GPDB restriction as Motion operators are push-based
return CEnfdProp::EpetProhibited;
}
// motion does not provide rewindability on its output
return CEnfdProp::EpetRequired;
}示例6:
//---------------------------------------------------------------------------
// @function:
// CPhysicalTVF::EpetRewindability
//
// @doc:
// Return the enforcing type for rewindability property based on this operator
//
//---------------------------------------------------------------------------
CEnfdProp::EPropEnforcingType
CPhysicalTVF::EpetRewindability
(
CExpressionHandle &exprhdl,
const CEnfdRewindability *per
)
const
{
// get rewindability delivered by the TVF node
CRewindabilitySpec *prs = CDrvdPropPlan::Pdpplan(exprhdl.Pdp())->Prs();
if (per->FCompatible(prs))
{
// required distribution is already provided
return CEnfdProp::EpetUnnecessary;
}
if (exprhdl.FHasOuterRefs())
{
// a TVF should not have a materialize on top of it if it has an outer ref
return CEnfdProp::EpetProhibited;
}
return CEnfdProp::EpetRequired;
}