greenplumn CDXLScalarCoalesce 代码
文件路径：/src/backend/gporca/libnaucrates/include/naucrates/dxl/operators/CDXLScalarCoalesce.h
/---------------------------------------------------------------------------
/ Greenplum Database
/ Copyright (C) 2012 EMC Corp.
/
/ @filename:
/ CDXLScalarCoalesce.h
/
/ @doc:
/ Class for representing DXL Coalesce operator
/---------------------------------------------------------------------------
#ifndef GPDXL_CDXLScalarCoalesce_H
#define GPDXL_CDXLScalarCoalesce_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:
/ CDXLScalarCoalesce
/
/ @doc:
/ Class for representing DXL Coalesce operator
/
/---------------------------------------------------------------------------
class CDXLScalarCoalesce : public CDXLScalar
{
private:
/ return type
IMDId *m_mdid_type;
public:
CDXLScalarCoalesce(const CDXLScalarCoalesce &) = delete;
/ ctor
CDXLScalarCoalesce(CMemoryPool *mp, IMDId *mdid_type);
/dtor
~CDXLScalarCoalesce() 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;
/ 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 CDXLScalarCoalesce *
Cast(CDXLOperator *dxl_op)
{
GPOS_ASSERT(nullptr != dxl_op);
GPOS_ASSERT(EdxlopScalarCoalesce == dxl_op->GetDXLOperator());
return dynamic_cast<CDXLScalarCoalesce *>(dxl_op);
}
};
} / namespace gpdxl
#endif / !GPDXL_CDXLScalarCoalesce_H
/ EOF
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