greenplumn CMDIdScCmp 代码
文件路径：/src/backend/gporca/libnaucrates/include/naucrates/md/CMDIdScCmp.h
/---------------------------------------------------------------------------
/ Greenplum Database
/ Copyright (C) 2013 EMC Corp.
/
/ @filename:
/ CMDIdScCmp.h
/
/ @doc:
/ Class for representing mdids of scalar comparison operators
/---------------------------------------------------------------------------
#ifndef GPMD_CMDIdScCmpFunc_H
#define GPMD_CMDIdScCmpFunc_H
#include "gpos/base.h"
#include "naucrates/md/CMDIdGPDB.h"
#include "naucrates/md/IMDType.h"
namespace gpmd
{
using namespace gpos;
/---------------------------------------------------------------------------
/ @class:
/ CMDIdScCmp
/
/ @doc:
/ Class for representing ids of scalar comparison operators
/
/---------------------------------------------------------------------------
class CMDIdScCmp : public IMDId
{
private:
/ mdid of source type
CMDIdGPDB *m_mdid_left;
/ mdid of destinatin type
CMDIdGPDB *m_mdid_right;
/ comparison type
IMDType::ECmpType m_comparision_type;
/ buffer for the serialized mdid
WCHAR m_mdid_array[GPDXL_MDID_LENGTH];
/ string representation of the mdid
CWStringStatic m_str;
/ serialize mdid
void Serialize();
public:
CMDIdScCmp(const CMDIdScCmp &) = delete;
/ ctor
CMDIdScCmp(CMDIdGPDB *left_mdid, CMDIdGPDB *right_mdid,
IMDType::ECmpType cmp_type);
/ dtor
~CMDIdScCmp() override;
EMDIdType
MdidType() const override
{
return EmdidScCmp;
}
/ string representation of mdid
const WCHAR *GetBuffer() const override;
/ source system id
CSystemId
Sysid() const override
{
return m_mdid_left->Sysid();
}
/ left type id
IMDId *GetLeftMdid() const;
/ right type id
IMDId *GetRightMdid() const;
IMDType::ECmpType
ParseCmpType() const
{
return m_comparision_type;
}
/ equality check
BOOL Equals(const IMDId *mdid) const override;
/ computes the hash value for the metadata id
ULONG HashValue() const override;
/ is the mdid valid
BOOL
IsValid() const override
{
return IMDId::IsValid(m_mdid_left) && IMDId::IsValid(m_mdid_right) &&
IMDType::EcmptOther != m_comparision_type;
}
/ serialize mdid in DXL as the value of the specified attribute
void Serialize(CXMLSerializer *xml_serializer,
const CWStringConst *attribute_str) const override;
/ debug print of the metadata id
IOstream &OsPrint(IOstream &os) const override;
/ const converter
static const CMDIdScCmp *
CastMdid(const IMDId *mdid)
{
GPOS_ASSERT(nullptr != mdid && EmdidScCmp == mdid->MdidType());
return dynamic_cast<const CMDIdScCmp *>(mdid);
}
/ non-const converter
static CMDIdScCmp *
CastMdid(IMDId *mdid)
{
GPOS_ASSERT(nullptr != mdid && EmdidScCmp == mdid->MdidType());
return dynamic_cast<CMDIdScCmp *>(mdid);
}
/ make a copy in the given memory pool
IMDId *
Copy(CMemoryPool *mp) const override
{
CMDIdGPDB *mdid_left = CMDIdGPDB::CastMdid(m_mdid_left->Copy(mp));
CMDIdGPDB *mdid_right = CMDIdGPDB::CastMdid(m_mdid_right->Copy(mp));
return GPOS_NEW(mp)
CMDIdScCmp(mdid_left, mdid_right, m_comparision_type);
}
};
} / namespace gpmd
#endif / !GPMD_CMDIdScCmpFunc_H
/ EOF
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