greenplumn IConstDXLNodeEvaluator 源码
greenplumn IConstDXLNodeEvaluator 代码
文件路径：/src/backend/gporca/libgpopt/include/gpopt/eval/IConstDXLNodeEvaluator.h
//---------------------------------------------------------------------------
// Greenplum Database
// Copyright (C) 2014 VMware, Inc. or its affiliates.
//
// @filename:
// IConstDXLNodeEvaluator.h
//
// @doc:
// Interface for evaluating constant expressions given as DXL
//
// @owner:
//
//
// @test:
//
//---------------------------------------------------------------------------
#ifndef GPOPT_IConstDXLNodeEvaluator_H
#define GPOPT_IConstDXLNodeEvaluator_H
#include "gpos/base.h"
// forward declaration
namespace gpdxl
{
class CDXLNode;
}
namespace gpopt
{
//---------------------------------------------------------------------------
// @class:
// IConstExprEvaluator
//
// @doc:
// Interface for evaluating constant expressions given as DXL
//
//---------------------------------------------------------------------------
class IConstDXLNodeEvaluator
{
public:
// dtor
virtual ~IConstDXLNodeEvaluator() = default;
// evaluate the given DXL node representing an expression and return the result
// as DXL. caller takes ownership of returned DXL node
virtual gpdxl::CDXLNode *EvaluateExpr(const gpdxl::CDXLNode *pdxlnExpr) = 0;
// returns true iff the evaluator can evaluate constant expressions without
// subqueries
virtual gpos::BOOL FCanEvalExpressions() = 0;
};
} // namespace gpopt
#endif // !GPOPT_IConstDXLNodeEvaluator_H
// EOF
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