//---------------------------------------------------------------------------
// @function:
// CPhysicalPartitionSelectorDML::EpetDistribution
//
// @doc:
// Return the enforcing type for distribution property based on this operator
//
//---------------------------------------------------------------------------
CEnfdProp::EPropEnforcingType
CPhysicalPartitionSelectorDML::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.HasOuterRefs())
{
return CEnfdProp::EpetProhibited;
}
return CEnfdProp::EpetRequired;
}
//---------------------------------------------------------------------------
// @function:
// CXformLeftAntiSemiApplyNotIn2LeftAntiSemiJoinNotInNoCorrelations::Exfp
//
// @doc:
// Compute xform promise for a given expression handle;
// outer references are not allowed
//
//---------------------------------------------------------------------------
CXform::EXformPromise
CXformLeftAntiSemiApplyNotIn2LeftAntiSemiJoinNotInNoCorrelations::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.HasOuterRefs(1 /*child_index*/) || CUtils::FInnerUsesExternalColsOnly(exprhdl))
{
return CXform::ExfpHigh;
}
return CXform::ExfpNone;
}
//---------------------------------------------------------------------------
// @function:
// CXformLeftOuterApply2LeftOuterJoin::Exfp
//
// @doc:
// Compute xform promise for a given expression handle;
// outer references are not allowed
//
//---------------------------------------------------------------------------
CXform::EXformPromise
CXformLeftOuterApply2LeftOuterJoin::Exfp
(
CExpressionHandle &exprhdl
)
const
{
// if there are outer refs that include columns from the immediate outer child, the
// transformation is applicable
if (exprhdl.HasOuterRefs(1 /*child_index*/) && !CUtils::FInnerUsesExternalColsOnly(exprhdl))
{
return CXform::ExfpHigh;
}
return CXform::ExfpNone;
}
//---------------------------------------------------------------------------
// @function:
// CXformLeftSemiJoin2InnerJoin::Exfp
//
// @doc:
// Compute xform promise for a given expression handle;
//
//---------------------------------------------------------------------------
CXform::EXformPromise
CXformLeftSemiJoin2InnerJoin::Exfp
(
CExpressionHandle &exprhdl
)
const
{
if (exprhdl.HasOuterRefs() || exprhdl.GetDrvdScalarProps(2)->FHasSubquery())
{
return ExfpNone;
}
CColRefSet *pcrsInnerOutput = exprhdl.GetRelationalProperties(1 /*child_index*/)->PcrsOutput();
CExpression *pexprScalar = exprhdl.PexprScalarChild(2 /*child_index*/);
CAutoMemoryPool amp;
// examine join predicate to determine xform applicability
if (!CPredicateUtils::FSimpleEqualityUsingCols(amp.Pmp(), pexprScalar, pcrsInnerOutput))
{
return ExfpNone;
}
return ExfpHigh;
}
