greenplumn CXformSplitGbAggDedup 源码
greenplumn CXformSplitGbAggDedup 代码
文件路径：/src/backend/gporca/libgpopt/include/gpopt/xforms/CXformSplitGbAggDedup.h
//---------------------------------------------------------------------------
// Greenplum Database
// Copyright (C) 2013 VMware, Inc. or its affiliates.
//
// @filename:
// CXformSplitGbAggDedup.h
//
// @doc:
// Split a dedup aggregate into a pair of local and global dedup aggregates
//---------------------------------------------------------------------------
#ifndef GPOPT_CXformSplitGbAggDedup_H
#define GPOPT_CXformSplitGbAggDedup_H
#include "gpos/base.h"
#include "gpopt/xforms/CXformSplitGbAgg.h"
namespace gpopt
{
using namespace gpos;
//---------------------------------------------------------------------------
// @class:
// CXformSplitGbAggDedup
//
// @doc:
// Split a dedup aggregate operator into pair of local and global aggregates
//
//---------------------------------------------------------------------------
class CXformSplitGbAggDedup : public CXformSplitGbAgg
{
private:
public:
CXformSplitGbAggDedup(const CXformSplitGbAggDedup &) = delete;
// ctor
explicit CXformSplitGbAggDedup(CMemoryPool *mp);
// dtor
~CXformSplitGbAggDedup() override = default;
// ident accessors
EXformId
Exfid() const override
{
return ExfSplitGbAggDedup;
}
// return a string for xform name
const CHAR *
SzId() const override
{
return "CXformSplitGbAggDedup";
}
// Compatibility function for splitting aggregates
BOOL
FCompatible(CXform::EXformId exfid) override
{
return (CXform::ExfSplitGbAggDedup != exfid);
}
// actual transform
void Transform(CXformContext *pxfctxt, CXformResult *pxfres,
CExpression *pexpr) const override;
}; // class CXformSplitGbAggDedup
} // namespace gpopt
#endif // !GPOPT_CXformSplitGbAggDedup_H
// EOF
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