greenplumn CConstExprEvaluatorDXL 源码
greenplumn CConstExprEvaluatorDXL 代码
文件路径：/src/backend/gporca/libgpopt/include/gpopt/eval/CConstExprEvaluatorDXL.h
//---------------------------------------------------------------------------
// Greenplum Database
// Copyright (C) 2014 VMware, Inc. or its affiliates.
//
// @filename:
// CConstExprEvaluatorDXL.h
//
// @doc:
// Constant expression evaluator implementation that delegates to a DXL evaluator
//
// @owner:
//
//
// @test:
//
//---------------------------------------------------------------------------
#ifndef GPOPT_CConstExprEvaluatorDXL_H
#define GPOPT_CConstExprEvaluatorDXL_H
#include "gpos/base.h"
#include "gpopt/base/CColRef.h"
#include "gpopt/eval/IConstExprEvaluator.h"
#include "gpopt/translate/CTranslatorDXLToExpr.h"
#include "gpopt/translate/CTranslatorExprToDXL.h"
#include "naucrates/dxl/operators/CDXLNode.h"
#include "naucrates/md/CMDName.h"
// forward declaration
namespace gpos
{
class CMemoryPool;
}
namespace gpopt
{
class CExpression;
class CMDAccessor;
class IConstDXLNodeEvaluator;
//---------------------------------------------------------------------------
// @class:
// CConstExprEvaluatorDXL
//
// @doc:
// Constant expression evaluator implementation that delegates to a DXL evaluator
//
//---------------------------------------------------------------------------
class CConstExprEvaluatorDXL : public IConstExprEvaluator
{
private:
// evaluates expressions represented as DXL, not owned
IConstDXLNodeEvaluator *m_pconstdxleval;
// translates CExpression's to DXL which can then be sent to the evaluator
CTranslatorExprToDXL m_trexpr2dxl;
// translates DXL coming from the evaluator back to CExpression
CTranslatorDXLToExpr m_trdxl2expr;
public:
CConstExprEvaluatorDXL(const CConstExprEvaluatorDXL &) = delete;
// ctor
CConstExprEvaluatorDXL(CMemoryPool *mp, CMDAccessor *md_accessor,
IConstDXLNodeEvaluator *pconstdxleval);
// dtor
~CConstExprEvaluatorDXL() override;
// 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 expressions
BOOL FCanEvalExpressions() override;
};
} // namespace gpopt
#endif // !GPOPT_CConstExprEvaluatorDXL_H
// EOF
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