greenplumn CConstExprEvaluatorDefault 源码
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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