greenplumn CConstExprEvaluatorDefault 代码
文件路径：/src/backend/gporca/libgpopt/include/gpopt/eval/CConstExprEvaluatorDefault.h
/---------------------------------------------------------------------------
/ Greenplum Database
/ Copyright (C) 2014 VMware, Inc. or its affiliates.
/
/ @filename:
/ CConstExprEvaluatorDefault.h
/
/ @doc:
/ Dummy implementation of the constant expression evaluator
/
/ @owner:
/
/
/ @test:
/
/---------------------------------------------------------------------------
#ifndef GPOPT_CConstExprEvaluatorDefault_H
#define GPOPT_CConstExprEvaluatorDefault_H
#include "gpos/base.h"
#include "gpopt/eval/IConstExprEvaluator.h"
namespace gpopt
{
/---------------------------------------------------------------------------
/ @class:
/ CConstExprEvaluatorDefault
/
/ @doc:
/ Constant expression evaluator default implementation for the case when
/ no database instance is available
/
/---------------------------------------------------------------------------
class CConstExprEvaluatorDefault : public IConstExprEvaluator
{
private:
public:
CConstExprEvaluatorDefault(const CConstExprEvaluatorDefault &) = delete;
/ ctor
CConstExprEvaluatorDefault() : IConstExprEvaluator()
{
}
/ dtor
~CConstExprEvaluatorDefault() override;
/ Evaluate the given expression and return the result as a new expression
CExpression *PexprEval(CExpression *pexpr) override;
/ Returns true iff the evaluator can evaluate constant expressions
BOOL FCanEvalExpressions() override;
};
} / namespace gpopt
#endif / !GPOPT_CConstExprEvaluatorGPDB_H
/ EOF
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