greenplumn CConstExprEvaluatorForDates 源码
greenplumn CConstExprEvaluatorForDates 代码
文件路径：/src/backend/gporca/server/include/unittest/gpopt/CConstExprEvaluatorForDates.h
//---------------------------------------------------------------------------
// Greenplum Database
// Copyright (C) 2014 VMware, Inc. or its affiliates.
//
// @filename:
// CConstExprEvaluatorForDates.h
//
// @doc:
// Implementation of a constant expression evaluator for dates data
//
// @owner:
//
//
// @test:
//
//---------------------------------------------------------------------------
#ifndef GPOPT_CConstExprEvaluatorForDates_H
#define GPOPT_CConstExprEvaluatorForDates_H
#include "gpos/base.h"
#include "gpopt/eval/IConstExprEvaluator.h"
namespace gpopt
{
// fwd declarations
class CExpression;
//---------------------------------------------------------------------------
// @class:
// CConstExprEvaluatorForDates
//
// @doc:
// Implementation of a constant expression evaluator for dates data.
// It is meant to be used in Optimizer tests that have no access to
// backend evaluator.
//
//---------------------------------------------------------------------------
class CConstExprEvaluatorForDates : public IConstExprEvaluator
{
private:
// memory pool, not owned
CMemoryPool *m_mp;
public:
CConstExprEvaluatorForDates(const CConstExprEvaluatorForDates &) = delete;
// ctor
explicit CConstExprEvaluatorForDates(CMemoryPool *mp) : m_mp(mp)
{
}
// dtor
~CConstExprEvaluatorForDates() override = default;
// evaluate the given expression and return the result as a new expression
// caller takes ownership of returned expression
CExpression *PexprEval(CExpression *pexpr) override;
// returns true iff the evaluator can evaluate constant expressions
BOOL
FCanEvalExpressions() override
{
return true;
}
}; // class CConstExprEvaluatorForDates
} // namespace gpopt
#endif // !GPOPT_CConstExprEvaluatorForDates_H
// EOF
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