greenplumn CDXLScalarProjList 代码
文件路径：/src/backend/gporca/libnaucrates/include/naucrates/dxl/operators/CDXLScalarProjList.h
/---------------------------------------------------------------------------
/ Greenplum Database
/ Copyright (C) 2010 Greenplum, Inc.
/
/ @filename:
/ CDXLScalarProjList.h
/
/ @doc:
/ Class for representing DXL projection lists.
/---------------------------------------------------------------------------
#ifndef GPDXL_CDXLScalarProjList_H
#define GPDXL_CDXLScalarProjList_H
#include "gpos/base.h"
#include "naucrates/dxl/operators/CDXLScalar.h"
namespace gpdxl
{
/---------------------------------------------------------------------------
/ @class:
/ CDXLScalarProjList
/
/ @doc:
/ Projection list in operators.
/
/---------------------------------------------------------------------------
class CDXLScalarProjList : public CDXLScalar
{
private:
public:
CDXLScalarProjList(CDXLScalarProjList &) = delete;
/ ctor/dtor
explicit CDXLScalarProjList(CMemoryPool *mp);
~CDXLScalarProjList() override = default;
/ ident accessors
Edxlopid GetDXLOperator() const override;
/ name of the operator
const CWStringConst *GetOpNameStr() const override;
/ serialize operator in DXL format
void SerializeToDXL(CXMLSerializer *, const CDXLNode *) const override;
/ conversion function
static CDXLScalarProjList *
Cast(CDXLOperator *dxl_op)
{
GPOS_ASSERT(nullptr != dxl_op);
GPOS_ASSERT(EdxlopScalarProjectList == dxl_op->GetDXLOperator());
return dynamic_cast<CDXLScalarProjList *>(dxl_op);
}
/ does the operator return a boolean result
BOOL
HasBoolResult(CMDAccessor * /md_accessor
) const override
{
GPOS_ASSERT(!"Invalid function call on a container operator");
return false;
}
#ifdef GPOS_DEBUG
/ checks whether the operator has valid structure, i.e. number and
/ types of child nodes
void AssertValid(const CDXLNode *dxlnode,
BOOL validate_children) const override;
#endif / GPOS_DEBUG
};
} / namespace gpdxl
#endif / !GPDXL_CDXLScalarProjList_H
/ EOF
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