| //--------------------------------------------------------------------------- |
| // Greenplum Database |
| // Copyright (C) 2012 EMC Corp. |
| // |
| // @filename: |
| // CGPDBAttInfo.h |
| // |
| // @doc: |
| // Class to uniquely identify a column in GPDB |
| // |
| // @test: |
| // |
| // |
| //--------------------------------------------------------------------------- |
| |
| #ifndef GPDXL_CGPDBAttInfo_H |
| #define GPDXL_CGPDBAttInfo_H |
| |
| #include "gpos/base.h" |
| #include "gpos/common/CRefCount.h" |
| #include "gpos/utils.h" |
| |
| #include "naucrates/dxl/gpdb_types.h" |
| |
| namespace gpdxl |
| { |
| using namespace gpos; |
| |
| //--------------------------------------------------------------------------- |
| // @class: |
| // CGPDBAttInfo |
| // |
| // @doc: |
| // Class to uniquely identify a column in GPDB |
| // |
| //--------------------------------------------------------------------------- |
| class CGPDBAttInfo : public CRefCount |
| { |
| private: |
| // query level number |
| ULONG m_query_level; |
| |
| // varno in the rtable |
| ULONG m_varno; |
| |
| // attno |
| INT m_attno; |
| |
| public: |
| CGPDBAttInfo(const CGPDBAttInfo &) = delete; |
| |
| // ctor |
| CGPDBAttInfo(ULONG query_level, ULONG var_no, INT attrnum) |
| : m_query_level(query_level), m_varno(var_no), m_attno(attrnum) |
| { |
| } |
| |
| // d'tor |
| ~CGPDBAttInfo() override = default; |
| |
| // accessor |
| ULONG |
| GetQueryLevel() const |
| { |
| return m_query_level; |
| } |
| |
| // accessor |
| ULONG |
| GetVarNo() const |
| { |
| return m_varno; |
| } |
| |
| // accessor |
| INT |
| GetAttNo() const |
| { |
| return m_attno; |
| } |
| |
| // equality check |
| BOOL |
| Equals(const CGPDBAttInfo &gpdb_att_info) const |
| { |
| return m_query_level == gpdb_att_info.m_query_level && |
| m_varno == gpdb_att_info.m_varno && |
| m_attno == gpdb_att_info.m_attno; |
| } |
| |
| // hash value |
| ULONG |
| HashValue() const |
| { |
| return gpos::CombineHashes( |
| gpos::HashValue(&m_query_level), |
| gpos::CombineHashes(gpos::HashValue(&m_varno), |
| gpos::HashValue(&m_attno))); |
| } |
| }; |
| |
| // hash function |
| inline ULONG |
| HashGPDBAttInfo(const CGPDBAttInfo *gpdb_att_info) |
| { |
| GPOS_ASSERT(nullptr != gpdb_att_info); |
| return gpdb_att_info->HashValue(); |
| } |
| |
| // equality function |
| inline BOOL |
| EqualGPDBAttInfo(const CGPDBAttInfo *gpdb_att_info_a, |
| const CGPDBAttInfo *gpdb_att_info_b) |
| { |
| GPOS_ASSERT(nullptr != gpdb_att_info_a && nullptr != gpdb_att_info_b); |
| return gpdb_att_info_a->Equals(*gpdb_att_info_b); |
| } |
| |
| } // namespace gpdxl |
| |
| #endif // !GPDXL_CGPDBAttInfo_H |
| |
| // EOF |
