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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