greenplumn CPatternTree 源码
greenplumn CPatternTree 代码
文件路径：/src/backend/gporca/libgpopt/include/gpopt/operators/CPatternTree.h
//---------------------------------------------------------------------------
// Greenplum Database
// Copyright (C) 2009 Greenplum, Inc.
//
// @filename:
// CPatternTree.h
//
// @doc:
// Pattern that matches entire expression trees
//---------------------------------------------------------------------------
#ifndef GPOPT_CPatternTree_H
#define GPOPT_CPatternTree_H
#include "gpos/base.h"
#include "gpopt/operators/CPattern.h"
namespace gpopt
{
using namespace gpos;
//---------------------------------------------------------------------------
// @class:
// CPatternTree
//
// @doc:
// Pattern that matches entire expression trees, e.g. scalar expressions
//
//---------------------------------------------------------------------------
class CPatternTree : public CPattern
{
private:
public:
CPatternTree(const CPatternTree &) = delete;
// ctor
explicit CPatternTree(CMemoryPool *mp) : CPattern(mp)
{
}
// dtor
~CPatternTree() override = default;
// check if operator is a pattern leaf
BOOL
FLeaf() const override
{
return false;
}
// ident accessors
EOperatorId
Eopid() const override
{
return EopPatternTree;
}
// return a string for operator name
const CHAR *
SzId() const override
{
return "CPatternTree";
}
}; // class CPatternTree
} // namespace gpopt
#endif // !GPOPT_CPatternTree_H
// EOF
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