greenplumn CPhysicalLeftSemiHashJoin 源码
greenplumn CPhysicalLeftSemiHashJoin 代码
文件路径：/src/backend/gporca/libgpopt/src/operators/CPhysicalLeftSemiHashJoin.cpp
//---------------------------------------------------------------------------
// Greenplum Database
// Copyright (C) 2012 EMC Corp.
//
// @filename:
// CPhysicalLeftSemiHashJoin.cpp
//
// @doc:
// Implementation of left semi hash join operator
//---------------------------------------------------------------------------
#include "gpopt/operators/CPhysicalLeftSemiHashJoin.h"
#include "gpos/base.h"
#include "gpopt/base/CDistributionSpecHashed.h"
#include "gpopt/base/CUtils.h"
using namespace gpopt;
//---------------------------------------------------------------------------
// @function:
// CPhysicalLeftSemiHashJoin::CPhysicalLeftSemiHashJoin
//
// @doc:
// Ctor
//
//---------------------------------------------------------------------------
CPhysicalLeftSemiHashJoin::CPhysicalLeftSemiHashJoin(
CMemoryPool *mp, CExpressionArray *pdrgpexprOuterKeys,
CExpressionArray *pdrgpexprInnerKeys, IMdIdArray *hash_opfamilies,
CXform::EXformId origin_xform)
: CPhysicalHashJoin(mp, pdrgpexprOuterKeys, pdrgpexprInnerKeys,
hash_opfamilies, origin_xform)
{
}
//---------------------------------------------------------------------------
// @function:
// CPhysicalLeftSemiHashJoin::~CPhysicalLeftSemiHashJoin
//
// @doc:
// Dtor
//
//---------------------------------------------------------------------------
CPhysicalLeftSemiHashJoin::~CPhysicalLeftSemiHashJoin() = default;
//---------------------------------------------------------------------------
// @function:
// CPhysicalLeftSemiHashJoin::FProvidesReqdCols
//
// @doc:
// Check if required columns are included in output columns
//
//---------------------------------------------------------------------------
BOOL
CPhysicalLeftSemiHashJoin::FProvidesReqdCols(CExpressionHandle &exprhdl,
CColRefSet *pcrsRequired,
ULONG // ulOptReq
) const
{
// left semi join only propagates columns from left child
return FOuterProvidesReqdCols(exprhdl, pcrsRequired);
}
// EOF
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