greenplumn CXformImplementPartitionSelector 源码
greenplumn CXformImplementPartitionSelector 代码
文件路径：/src/backend/gporca/libgpopt/include/gpopt/xforms/CXformImplementPartitionSelector.h
//---------------------------------------------------------------------------
// Greenplum Database
// Copyright (C) 2014 VMware, Inc. or its affiliates.
//
// @filename:
// CXformImplementPartitionSelector.h
//
// @doc:
// Implement PartitionSelector
//---------------------------------------------------------------------------
#ifndef GPOPT_CXformImplementPartitionSelector_H
#define GPOPT_CXformImplementPartitionSelector_H
#include "gpos/base.h"
#include "gpopt/xforms/CXformImplementation.h"
namespace gpopt
{
using namespace gpos;
//---------------------------------------------------------------------------
// @class:
// CXformImplementPartitionSelector
//
// @doc:
// Implement PartitionSelector
//
//---------------------------------------------------------------------------
class CXformImplementPartitionSelector : public CXformImplementation
{
private:
public:
CXformImplementPartitionSelector(const CXformImplementPartitionSelector &) =
delete;
// ctor
explicit CXformImplementPartitionSelector(CMemoryPool *mp);
// dtor
~CXformImplementPartitionSelector() override = default;
// ident accessors
EXformId
Exfid() const override
{
return ExfImplementPartitionSelector;
}
// xform name
const CHAR *
SzId() const override
{
return "CXformImplementPartitionSelector";
}
// compute xform promise for a given expression handle
EXformPromise
Exfp(CExpressionHandle & //exprhdl
) const override
{
return CXform::ExfpHigh;
}
// actual transform
void Transform(CXformContext *, CXformResult *,
CExpression *) const override;
}; // class CXformImplementPartitionSelector
} // namespace gpopt
#endif // !GPOPT_CXformImplementPartitionSelector_H
// EOF
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