greenplumn CXformSelect2IndexGet 源码
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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