greenplumn CDXLTranslateContext 源码
greenplumn CDXLTranslateContext 代码
文件路径:/src/include/gpopt/translate/CDXLTranslateContext.h
//---------------------------------------------------------------------------
// Greenplum Database
// Copyright (C) 2010 Greenplum, Inc.
//
// @filename:
// CDXLTranslateContext.h
//
// @doc:
// Class providing access to translation context, such as mappings between
// table names, operator names, etc. and oids
//
// @test:
//
//
//---------------------------------------------------------------------------
#ifndef GPDXL_CDXLTranslateContext_H
#define GPDXL_CDXLTranslateContext_H
#include "gpos/base.h"
#include "gpos/common/CHashMap.h"
#include "gpos/common/CHashMapIter.h"
#include "gpopt/translate/CMappingElementColIdParamId.h"
// fwd decl
struct TargetEntry;
namespace gpdxl
{
using namespace gpos;
// hash maps mapping ULONG -> TargetEntry
using ULongToTargetEntryMap =
CHashMap<ULONG, TargetEntry, gpos::HashValue<ULONG>, gpos::Equals<ULONG>,
CleanupDelete<ULONG>, CleanupNULL>;
// hash maps mapping ULONG -> CMappingElementColIdParamId
using ULongToColParamMap =
CHashMap<ULONG, CMappingElementColIdParamId, gpos::HashValue<ULONG>,
gpos::Equals<ULONG>, CleanupDelete<ULONG>,
CleanupRelease<CMappingElementColIdParamId>>;
using ULongToColParamMapIter =
CHashMapIter<ULONG, CMappingElementColIdParamId, gpos::HashValue<ULONG>,
gpos::Equals<ULONG>, CleanupDelete<ULONG>,
CleanupRelease<CMappingElementColIdParamId>>;
//---------------------------------------------------------------------------
// @class:
// CDXLTranslateContext
//
// @doc:
// Class providing access to translation context, such as mappings between
// ColIds and target entries
//
//---------------------------------------------------------------------------
class CDXLTranslateContext
{
private:
CMemoryPool *m_mp;
// mappings ColId->TargetEntry used for intermediate DXL nodes
ULongToTargetEntryMap *m_colid_to_target_entry_map;
// mappings ColId->ParamId used for outer refs in subplans
ULongToColParamMap *m_colid_to_paramid_map;
// is the node for which this context is built a child of an aggregate node
// This is used to assign 0 instead of OUTER for the varno value of columns
// in an Agg node, as expected in GPDB
// TODO: antovl - Jan 26, 2011; remove this when Agg node in GPDB is fixed
// to use OUTER instead of 0 for Var::varno in Agg target lists (MPP-12034)
BOOL m_is_child_agg_node;
// copy the params hashmap
void CopyParamHashmap(ULongToColParamMap *original);
public:
CDXLTranslateContext(const CDXLTranslateContext &) = delete;
// ctor/dtor
CDXLTranslateContext(CMemoryPool *mp, BOOL is_child_agg_node);
CDXLTranslateContext(CMemoryPool *mp, BOOL is_child_agg_node,
ULongToColParamMap *original);
~CDXLTranslateContext();
// is parent an aggregate node
BOOL IsParentAggNode() const;
// return the params hashmap
ULongToColParamMap *
GetColIdToParamIdMap()
{
return m_colid_to_paramid_map;
}
// return the target entry corresponding to the given ColId
const TargetEntry *GetTargetEntry(ULONG colid) const;
// return the param id corresponding to the given ColId
const CMappingElementColIdParamId *GetParamIdMappingElement(
ULONG colid) const;
// store the mapping of the given column id and target entry
void InsertMapping(ULONG colid, TargetEntry *target_entry);
// store the mapping of the given column id and param id
BOOL FInsertParamMapping(ULONG colid,
CMappingElementColIdParamId *pmecolidparamid);
};
// array of dxl translation context
using CDXLTranslationContextArray =
CDynamicPtrArray<const CDXLTranslateContext, CleanupNULL>;
} // namespace gpdxl
#endif // !GPDXL_CDXLTranslateContext_H
// EOF
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