greenplumn CDXLScalarMinMax 源码
greenplumn CDXLScalarMinMax 代码
文件路径：/src/backend/gporca/libnaucrates/include/naucrates/dxl/operators/CDXLScalarMinMax.h
//---------------------------------------------------------------------------
// Greenplum Database
// Copyright (C) 2015 VMware, Inc. or its affiliates.
//
// @filename:
// CDXLScalarMinMax.h
//
// @doc:
// Class for representing DXL MinMax operator
//---------------------------------------------------------------------------
#ifndef GPDXL_CDXLScalarMinMax_H
#define GPDXL_CDXLScalarMinMax_H
#include "gpos/base.h"
#include "naucrates/dxl/operators/CDXLScalar.h"
#include "naucrates/md/IMDId.h"
namespace gpdxl
{
using namespace gpos;
using namespace gpmd;
//---------------------------------------------------------------------------
// @class:
// CDXLScalarMinMax
//
// @doc:
// Class for representing DXL MinMax operator
//
//---------------------------------------------------------------------------
class CDXLScalarMinMax : public CDXLScalar
{
public:
// types of operations: either min or max
enum EdxlMinMaxType
{
EmmtMin,
EmmtMax,
EmmtSentinel
};
private:
// return type
IMDId *m_mdid_type;
// min/max type
EdxlMinMaxType m_min_max_type;
public:
CDXLScalarMinMax(const CDXLScalarMinMax &) = delete;
// ctor
CDXLScalarMinMax(CMemoryPool *mp, IMDId *mdid_type,
EdxlMinMaxType min_max_type);
//dtor
~CDXLScalarMinMax() override;
// name of the operator
const CWStringConst *GetOpNameStr() const override;
// return type
virtual IMDId *
MdidType() const
{
return m_mdid_type;
}
// DXL Operator ID
Edxlopid GetDXLOperator() const override;
// min/max type
EdxlMinMaxType
GetMinMaxType() const
{
return m_min_max_type;
}
// serialize operator in DXL format
void SerializeToDXL(CXMLSerializer *xml_serializer,
const CDXLNode *node) const override;
// does the operator return a boolean result
BOOL HasBoolResult(CMDAccessor *md_accessor) const override;
#ifdef GPOS_DEBUG
// checks whether the operator has valid structure, i.e. number and
// types of child nodes
void AssertValid(const CDXLNode *node,
BOOL validate_children) const override;
#endif // GPOS_DEBUG
// conversion function
static CDXLScalarMinMax *
Cast(CDXLOperator *dxl_op)
{
GPOS_ASSERT(nullptr != dxl_op);
GPOS_ASSERT(EdxlopScalarMinMax == dxl_op->GetDXLOperator());
return dynamic_cast<CDXLScalarMinMax *>(dxl_op);
}
};
} // namespace gpdxl
#endif // !GPDXL_CDXLScalarMinMax_H
// EOF
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