greenplumn CCTEListEntry 源码

  • 2022-08-18
  • 浏览 (466)

greenplumn CCTEListEntry 代码

文件路径:/src/backend/gpopt/translate/CCTEListEntry.cpp

//---------------------------------------------------------------------------
//	Greenplum Database
//	Copyright (C) 2012 EMC Corp.
//
//	@filename:
//		CCTEListEntry.cpp
//
//	@doc:
//		Implementation of the class representing the list of common table
//		expression defined at a query level
//
//	@test:
//
//
//---------------------------------------------------------------------------

extern "C" {
#include "postgres.h"

#include "nodes/parsenodes.h"
}
#include "gpos/base.h"

#include "gpopt/gpdbwrappers.h"
#include "gpopt/translate/CCTEListEntry.h"
using namespace gpdxl;

//---------------------------------------------------------------------------
//	@function:
//		CCTEListEntry::CCTEListEntry
//
//	@doc:
//		Ctor: single CTE
//
//---------------------------------------------------------------------------
CCTEListEntry::CCTEListEntry(CMemoryPool *mp, ULONG query_level,
							 CommonTableExpr *cte, CDXLNode *cte_producer)
	: m_query_level(query_level), m_cte_info(nullptr)
{
	GPOS_ASSERT(nullptr != cte && nullptr != cte_producer);

	m_cte_info = GPOS_NEW(mp) HMSzCTEInfo(mp);
	Query *cte_query = (Query *) cte->ctequery;

	BOOL result GPOS_ASSERTS_ONLY = m_cte_info->Insert(
		cte->ctename,
		GPOS_NEW(mp) SCTEProducerInfo(cte_producer, cte_query->targetList));

	GPOS_ASSERT(result);
}

//---------------------------------------------------------------------------
//	@function:
//		CCTEListEntry::CCTEListEntry
//
//	@doc:
//		Ctor: multiple CTEs
//
//---------------------------------------------------------------------------
CCTEListEntry::CCTEListEntry(CMemoryPool *mp, ULONG query_level, List *cte_list,
							 CDXLNodeArray *cte_dxl_arr)
	: m_query_level(query_level), m_cte_info(nullptr)
{
	GPOS_ASSERT(nullptr != cte_dxl_arr);
	GPOS_ASSERT(cte_dxl_arr->Size() == gpdb::ListLength(cte_list));

	m_cte_info = GPOS_NEW(mp) HMSzCTEInfo(mp);
	const ULONG num_cte = cte_dxl_arr->Size();

	for (ULONG ul = 0; ul < num_cte; ul++)
	{
		CDXLNode *cte_producer = (*cte_dxl_arr)[ul];
		CommonTableExpr *cte = (CommonTableExpr *) gpdb::ListNth(cte_list, ul);

		Query *cte_query = (Query *) cte->ctequery;

		BOOL result GPOS_ASSERTS_ONLY = m_cte_info->Insert(
			cte->ctename,
			GPOS_NEW(mp) SCTEProducerInfo(cte_producer, cte_query->targetList));

		GPOS_ASSERT(result);
		GPOS_ASSERT(nullptr != m_cte_info->Find(cte->ctename));
	}
}

//---------------------------------------------------------------------------
//	@function:
//		CCTEListEntry::GetCTEProducer
//
//	@doc:
//		Return the query of the CTE referenced in the range table entry
//
//---------------------------------------------------------------------------
const CDXLNode *
CCTEListEntry::GetCTEProducer(const CHAR *cte_str) const
{
	SCTEProducerInfo *cte_info = m_cte_info->Find(cte_str);
	if (nullptr == cte_info)
	{
		return nullptr;
	}

	return cte_info->m_cte_producer;
}

//---------------------------------------------------------------------------
//	@function:
//		CCTEListEntry::GetCTEProducerTargetList
//
//	@doc:
//		Return the target list of the CTE referenced in the range table entry
//
//---------------------------------------------------------------------------
List *
CCTEListEntry::GetCTEProducerTargetList(const CHAR *cte_str) const
{
	SCTEProducerInfo *cte_info = m_cte_info->Find(cte_str);
	if (nullptr == cte_info)
	{
		return nullptr;
	}

	return cte_info->m_target_list;
}

//---------------------------------------------------------------------------
//	@function:
//		CCTEListEntry::AddCTEProducer
//
//	@doc:
//		Add a new CTE producer to this query level
//
//---------------------------------------------------------------------------
void
CCTEListEntry::AddCTEProducer(CMemoryPool *mp, CommonTableExpr *cte,
							  const CDXLNode *cte_producer)
{
	GPOS_ASSERT(nullptr == m_cte_info->Find(cte->ctename) &&
				"CTE entry already exists");
	Query *cte_query = (Query *) cte->ctequery;

	BOOL result GPOS_ASSERTS_ONLY = m_cte_info->Insert(
		cte->ctename,
		GPOS_NEW(mp) SCTEProducerInfo(cte_producer, cte_query->targetList));

	GPOS_ASSERT(result);
}

// EOF

相关信息

greenplumn 源码目录

相关文章

greenplumn CContextDXLToPlStmt 源码

greenplumn CContextQueryToDXL 源码

greenplumn CDXLTranslateContext 源码

greenplumn CDXLTranslateContextBaseTable 源码

greenplumn CMappingColIdVar 源码

greenplumn CMappingColIdVarPlStmt 源码

greenplumn CMappingElementColIdParamId 源码

greenplumn CMappingVarColId 源码

greenplumn CPartPruneStepsBuilder 源码

greenplumn CQueryMutators 源码

0  赞