greenplumn CDXLScalarArray 源码
greenplumn CDXLScalarArray 代码
文件路径：/src/backend/gporca/libnaucrates/include/naucrates/dxl/operators/CDXLScalarArray.h
//---------------------------------------------------------------------------
// Greenplum Database
// Copyright (C) 2012 EMC Corp.
//
// @filename:
// CDXLScalarArray.h
//
// @doc:
// Class for representing DXL scalar arrays
//---------------------------------------------------------------------------
#ifndef GPDXL_CDXLScalarArray_H
#define GPDXL_CDXLScalarArray_H
#include "gpos/base.h"
#include "naucrates/dxl/operators/CDXLScalar.h"
#include "naucrates/md/IMDId.h"
namespace gpdxl
{
using namespace gpmd;
//---------------------------------------------------------------------------
// @class:
// CDXLScalarArray
//
// @doc:
// Class for representing DXL arrays
//
//---------------------------------------------------------------------------
class CDXLScalarArray : public CDXLScalar
{
private:
// base element type id
IMDId *m_elem_type_mdid;
// array type id
IMDId *m_array_type_mdid;
// is it a multidimensional array
BOOL m_multi_dimensional_array;
public:
CDXLScalarArray(const CDXLScalarArray &) = delete;
// ctor
CDXLScalarArray(CMemoryPool *mp, IMDId *elem_type_mdid,
IMDId *array_type_mdid, BOOL multi_dimensional_array);
// dtor
~CDXLScalarArray() override;
// ident accessors
Edxlopid GetDXLOperator() const override;
// operator name
const CWStringConst *GetOpNameStr() const override;
// element type id
IMDId *ElementTypeMDid() const;
// array type id
IMDId *ArrayTypeMDid() const;
// is array multi-dimensional
BOOL IsMultiDimensional() const;
// serialize operator in DXL format
void SerializeToDXL(CXMLSerializer *xml_serializer,
const CDXLNode *dxlnode) const override;
// conversion function
static CDXLScalarArray *
Cast(CDXLOperator *dxl_op)
{
GPOS_ASSERT(nullptr != dxl_op);
GPOS_ASSERT(EdxlopScalarArray == dxl_op->GetDXLOperator());
return dynamic_cast<CDXLScalarArray *>(dxl_op);
}
// does the operator return a boolean result
BOOL
HasBoolResult(CMDAccessor * //md_accessor
) const override
{
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_CDXLScalarArray_H
// EOF
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