greenplumn IConstExprEvaluator 源码
greenplumn IConstExprEvaluator 代码
文件路径：/src/backend/gporca/libgpopt/include/gpopt/eval/IConstExprEvaluator.h
//---------------------------------------------------------------------------
// Greenplum Database
// Copyright (C) 2014 VMware, Inc. or its affiliates.
//
// @filename:
// IConstExprEvaluator.h
//
// @doc:
// Interface for constant expression evaluator in the optimizer
//
// @owner:
//
//
// @test:
//
//---------------------------------------------------------------------------
#ifndef GPOPT_IConstExprEvaluator_H
#define GPOPT_IConstExprEvaluator_H
#include "gpos/base.h"
#include "gpos/common/CRefCount.h"
namespace gpopt
{
using namespace gpos;
class CExpression; // forward declaration
//---------------------------------------------------------------------------
// @class:
// IConstExprEvaluator
//
// @doc:
// Interface to access the underlying evaluator of constant expressions
// (expressions that can be evaluated independent of the contents of the
// database)
//
//---------------------------------------------------------------------------
class IConstExprEvaluator : public CRefCount
{
public:
// dtor
~IConstExprEvaluator() override = default;
// evaluate the given expression and return the result as a new expression
// caller takes ownership of returned expression
virtual CExpression *PexprEval(CExpression *pexpr) = 0;
// returns true iff the evaluator can evaluate constant expressions without
// subqueries
virtual BOOL FCanEvalExpressions() = 0;
};
} // namespace gpopt
#endif // !GPOPT_IConstExprEvaluator_H
// EOF
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