//---------------------------------------------------------------------------
// @function:
// CPhysicalPartitionSelector::PdsRequired
//
// @doc:
// Compute required distribution of the n-th child
//
//---------------------------------------------------------------------------
CDistributionSpec *
CPhysicalPartitionSelector::PdsRequired
(
IMemoryPool *mp,
CExpressionHandle &exprhdl,
CDistributionSpec *pdsInput,
ULONG child_index,
CDrvdProp2dArray *, // pdrgpdpCtxt
ULONG // ulOptReq
)
const
{
GPOS_ASSERT(0 == child_index);
CDrvdPropRelational *pdprelDrvd = exprhdl.GetRelationalProperties();
CPartInfo *ppartinfo = pdprelDrvd->Ppartinfo();
BOOL fCovered = ppartinfo->FContainsScanId(m_scan_id);
if (fCovered)
{
// if partition consumer is defined below, do not pass distribution
// requirements down as this will cause the consumer and enforcer to be
// in separate slices
return GPOS_NEW(mp) CDistributionSpecAny(this->Eopid());
}
return PdsPassThru(mp, exprhdl, pdsInput, child_index);
}
