greenplumn CXformGbAgg2HashAgg 源码
greenplumn CXformGbAgg2HashAgg 代码
文件路径：/src/backend/gporca/libgpopt/include/gpopt/xforms/CXformGbAgg2HashAgg.h
//---------------------------------------------------------------------------
// Greenplum Database
// Copyright (C) 2009 Greenplum, Inc.
//
// @filename:
// CXformGbAgg2HashAgg.h
//
// @doc:
// Transform GbAgg to HashAgg
//---------------------------------------------------------------------------
#ifndef GPOPT_CXformGbAgg2HashAgg_H
#define GPOPT_CXformGbAgg2HashAgg_H
#include "gpos/base.h"
#include "gpopt/xforms/CXformImplementation.h"
namespace gpopt
{
using namespace gpos;
//---------------------------------------------------------------------------
// @class:
// CXformGbAgg2HashAgg
//
// @doc:
// Transform Get to TableScan
//
//---------------------------------------------------------------------------
class CXformGbAgg2HashAgg : public CXformImplementation
{
private:
protected:
// check if the transformation is applicable
static BOOL FApplicable(CExpression *pexpr);
public:
CXformGbAgg2HashAgg(const CXformGbAgg2HashAgg &) = delete;
// ctor
CXformGbAgg2HashAgg(CMemoryPool *mp);
// ctor
explicit CXformGbAgg2HashAgg(CExpression *pexprPattern);
// dtor
~CXformGbAgg2HashAgg() override = default;
// ident accessors
EXformId
Exfid() const override
{
return ExfGbAgg2HashAgg;
}
// return a string for xform name
const CHAR *
SzId() const override
{
return "CXformGbAgg2HashAgg";
}
// 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 CXformGbAgg2HashAgg
} // namespace gpopt
#endif // !GPOPT_CXformGbAgg2HashAgg_H
// EOF
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