greenplumn CXformSelect2IndexGet 代码
文件路径：/src/backend/gporca/libgpopt/include/gpopt/xforms/CXformSelect2IndexGet.h
/---------------------------------------------------------------------------
/ Greenplum Database
/ Copyright (C) 2012 EMC Corp.
/
/ @filename:
/ CXformSelect2IndexGet.h
/
/ @doc:
/ Transform select over table into an index get
/---------------------------------------------------------------------------
#ifndef GPOPT_CXformSelect2IndexGet_H
#define GPOPT_CXformSelect2IndexGet_H
#include "gpos/base.h"
#include "gpopt/operators/CLogicalGet.h"
#include "gpopt/xforms/CXformExploration.h"
namespace gpopt
{
using namespace gpos;
/---------------------------------------------------------------------------
/ @class:
/ CXformSelect2IndexGet
/
/ @doc:
/ Transform select over a table into an index get
/
/---------------------------------------------------------------------------
class CXformSelect2IndexGet : public CXformExploration
{
private:
/ private copy ctor
CXformSelect2IndexGet(const CXformSelect2IndexGet &);
/ return the column reference set of included / key columns
CColRefSet *GetColRefSet(CMemoryPool *mp, CLogicalGet *popGet,
const IMDIndex *pmdindex,
BOOL fIncludedColumns) const;
public:
/ ctor
explicit CXformSelect2IndexGet(CMemoryPool *mp);
/ dtor
~CXformSelect2IndexGet() override = default;
/ ident accessors
EXformId
Exfid() const override
{
return ExfSelect2IndexGet;
}
/ xform name
const CHAR *
SzId() const override
{
return "CXformSelect2IndexGet";
}
/ 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 CXformSelect2IndexGet
} / namespace gpopt
#endif / !GPOPT_CXformSelect2IndexGet_H
/ EOF
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