greenplumn CPhysicalLeftSemiNLJoin 源码
greenplumn CPhysicalLeftSemiNLJoin 代码
文件路径：/src/backend/gporca/libgpopt/src/operators/CPhysicalLeftSemiNLJoin.cpp
//---------------------------------------------------------------------------
// Greenplum Database
// Copyright (C) 2011 EMC Corp.
//
// @filename:
// CPhysicalLeftSemiNLJoin.cpp
//
// @doc:
// Implementation of left semi nested-loops join operator
//---------------------------------------------------------------------------
#include "gpopt/operators/CPhysicalLeftSemiNLJoin.h"
#include "gpos/base.h"
using namespace gpopt;
//---------------------------------------------------------------------------
// @function:
// CPhysicalLeftSemiNLJoin::CPhysicalLeftSemiNLJoin
//
// @doc:
// Ctor
//
//---------------------------------------------------------------------------
CPhysicalLeftSemiNLJoin::CPhysicalLeftSemiNLJoin(CMemoryPool *mp)
: CPhysicalNLJoin(mp)
{
}
//---------------------------------------------------------------------------
// @function:
// CPhysicalLeftSemiNLJoin::~CPhysicalLeftSemiNLJoin
//
// @doc:
// Dtor
//
//---------------------------------------------------------------------------
CPhysicalLeftSemiNLJoin::~CPhysicalLeftSemiNLJoin() = default;
//---------------------------------------------------------------------------
// @function:
// CPhysicalLeftSemiNLJoin::FProvidesReqdCols
//
// @doc:
// Check if required columns are included in output columns
//
//---------------------------------------------------------------------------
BOOL
CPhysicalLeftSemiNLJoin::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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