greenplumn CCTEListEntry 源码
greenplumn CCTEListEntry 代码
文件路径：/src/include/gpopt/translate/CCTEListEntry.h
//---------------------------------------------------------------------------
// Greenplum Database
// Copyright (C) 2011 Greenplum, Inc.
//
// @filename:
// CCTEListEntry.h
//
// @doc:
// Class representing the list of common table expression defined at a
// query level
//
// @test:
//
//---------------------------------------------------------------------------
#ifndef GPDXL_CCTEListEntry_H
#define GPDXL_CCTEListEntry_H
#include "gpos/base.h"
#include "gpos/common/CHashMap.h"
#include "naucrates/dxl/operators/CDXLNode.h"
// fwd declaration
struct Query;
struct List;
struct RangeTblEntry;
struct CommonTableExpr;
using namespace gpos;
namespace gpdxl
{
// hash on character arrays
inline ULONG
HashStr(const CHAR *str)
{
return gpos::HashByteArray((BYTE *) str, clib::Strlen(str));
}
// equality on character arrays
inline BOOL
StrEqual(const CHAR *str_a, const CHAR *str_b)
{
return (0 == clib::Strcmp(str_a, str_b));
}
//---------------------------------------------------------------------------
// @class:
// CCTEListEntry
//
// @doc:
// Class representing the list of common table expression defined at a
// query level
//
//---------------------------------------------------------------------------
class CCTEListEntry : public CRefCount
{
private:
// pair of DXL CTE producer and target list of the original CTE query
struct SCTEProducerInfo
{
const CDXLNode *m_cte_producer;
List *m_target_list;
// ctor
SCTEProducerInfo(const CDXLNode *cte_producer, List *target_list)
: m_cte_producer(cte_producer), m_target_list(target_list)
{
}
};
// hash maps mapping CHAR *->SCTEProducerInfo
using HMSzCTEInfo = CHashMap<CHAR, SCTEProducerInfo, HashStr, StrEqual,
CleanupNULL, CleanupDelete>;
// query level where the CTEs are defined
ULONG m_query_level;
// CTE producers at that level indexed by their name
HMSzCTEInfo *m_cte_info;
public:
// ctor: single CTE
CCTEListEntry(CMemoryPool *mp, ULONG query_level, CommonTableExpr *cte,
CDXLNode *cte_producer);
// ctor: multiple CTEs
CCTEListEntry(CMemoryPool *mp, ULONG query_level, List *cte_list,
CDXLNodeArray *dxlnodes);
// dtor
~CCTEListEntry() override
{
m_cte_info->Release();
};
// the query level
ULONG
GetQueryLevel() const
{
return m_query_level;
}
// lookup CTE producer by its name
const CDXLNode *GetCTEProducer(const CHAR *cte_str) const;
// lookup CTE producer target list by its name
List *GetCTEProducerTargetList(const CHAR *cte_str) const;
// add a new CTE producer for this level
void AddCTEProducer(CMemoryPool *mp, CommonTableExpr *cte,
const CDXLNode *cte_producer);
};
// hash maps mapping ULONG -> CCTEListEntry
using HMUlCTEListEntry =
CHashMap<ULONG, CCTEListEntry, gpos::HashValue<ULONG>, gpos::Equals<ULONG>,
CleanupDelete<ULONG>, CleanupRelease>;
// iterator
using HMIterUlCTEListEntry =
CHashMapIter<ULONG, CCTEListEntry, gpos::HashValue<ULONG>,
gpos::Equals<ULONG>, CleanupDelete<ULONG>, CleanupRelease>;
} // namespace gpdxl
#endif // !GPDXL_CCTEListEntry_H
//EOF
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