greenplumn CLogicalUnary 源码
greenplumn CLogicalUnary 代码
文件路径：/src/backend/gporca/libgpopt/src/operators/CLogicalUnary.cpp
//---------------------------------------------------------------------------
// Greenplum Database
// Copyright (C) 2013 EMC Corp.
//
// @filename:
// CLogicalUnary.cpp
//
// @doc:
// Implementation of logical unary operators
//---------------------------------------------------------------------------
#include "gpopt/operators/CLogicalUnary.h"
#include "gpos/base.h"
#include "gpopt/xforms/CXformUtils.h"
#include "naucrates/statistics/CProjectStatsProcessor.h"
using namespace gpopt;
//---------------------------------------------------------------------------
// @function:
// CLogicalUnary::Matches
//
// @doc:
// Match function
//
//---------------------------------------------------------------------------
BOOL
CLogicalUnary::Matches(COperator *pop) const
{
return (pop->Eopid() == Eopid());
}
//---------------------------------------------------------------------------
// @function:
// CLogicalUnary::Esp
//
// @doc:
// Promise level for stat derivation
//
//---------------------------------------------------------------------------
CLogical::EStatPromise
CLogicalUnary::Esp(CExpressionHandle &exprhdl) const
{
// low promise for stat derivation if scalar predicate has subqueries, or logical
// expression has outer-refs or is part of an Apply expression
if (exprhdl.DeriveHasSubquery(1) || exprhdl.HasOuterRefs() ||
(nullptr != exprhdl.Pgexpr() &&
CXformUtils::FGenerateApply(exprhdl.Pgexpr()->ExfidOrigin())))
{
return EspLow;
}
return EspHigh;
}
//---------------------------------------------------------------------------
// @function:
// CLogicalUnary::PstatsDeriveProject
//
// @doc:
// Derive statistics for projection operators
//
//---------------------------------------------------------------------------
IStatistics *
CLogicalUnary::PstatsDeriveProject(CMemoryPool *mp, CExpressionHandle &exprhdl,
UlongToIDatumMap *phmuldatum) const
{
GPOS_ASSERT(Esp(exprhdl) > EspNone);
IStatistics *child_stats = exprhdl.Pstats(0);
CReqdPropRelational *prprel =
CReqdPropRelational::GetReqdRelationalProps(exprhdl.Prp());
CColRefSet *pcrs = prprel->PcrsStat();
ULongPtrArray *colids = GPOS_NEW(mp) ULongPtrArray(mp);
pcrs->ExtractColIds(mp, colids);
IStatistics *stats = CProjectStatsProcessor::CalcProjStats(
mp, dynamic_cast<CStatistics *>(child_stats), colids, phmuldatum);
// clean up
colids->Release();
return stats;
}
// EOF
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