greenplumn CXformImplementInnerJoin 源码
greenplumn CXformImplementInnerJoin 代码
文件路径：/src/backend/gporca/libgpopt/include/gpopt/xforms/CXformImplementInnerJoin.h
//---------------------------------------------------------------------------
// Greenplum Database
// Copyright (C) 2011 EMC Corp.
//
// @filename:
// CXformImplementInnerJoin.h
//
// @doc:
// Transform inner join to inner Hash/NLJ Join
//---------------------------------------------------------------------------
#ifndef GPOPT_CXformImplementInnerJoin_H
#define GPOPT_CXformImplementInnerJoin_H
#include "gpos/base.h"
#include "gpopt/xforms/CXformImplementation.h"
namespace gpopt
{
using namespace gpos;
//---------------------------------------------------------------------------
// @class:
// CXformImplementInnerJoin
//
// @doc:
// Transform inner join to inner Hash Join or Inner Nested Loop Join
// (if a Hash Join is not possible)
//
//---------------------------------------------------------------------------
class CXformImplementInnerJoin : public CXformImplementation
{
private:
public:
CXformImplementInnerJoin(const CXformImplementInnerJoin &) = delete;
// ctor
explicit CXformImplementInnerJoin(CMemoryPool *mp);
// dtor
~CXformImplementInnerJoin() override = default;
// ident accessors
EXformId
Exfid() const override
{
return ExfImplementInnerJoin;
}
// return a string for xform name
const CHAR *
SzId() const override
{
return "CXformImplementInnerJoin";
}
// compute xform promise for a given expression handle
EXformPromise Exfp(CExpressionHandle &exprhdl) const override;
// actual transform
void Transform(CXformContext *pxfctxt, CXformResult *pxfres,
CExpression *pexpr) const override;
}; // class CXformImplementInnerJoin
} // namespace gpopt
#endif // !GPOPT_CXformImplementInnerJoin_H
// EOF
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