greenplumn CDXLTranslateContext 代码
文件路径：/src/backend/gpopt/translate/CDXLTranslateContext.cpp
/---------------------------------------------------------------------------
/ Greenplum Database
/ Copyright (C) 2010 Greenplum, Inc.
/
/ @filename:
/ CDXLTranslateContext.cpp
/
/ @doc:
/ Implementation of the methods for accessing translation context
/
/ @test:
/
/
/---------------------------------------------------------------------------
#include "gpopt/translate/CDXLTranslateContext.h"
using namespace gpdxl;
using namespace gpos;
/---------------------------------------------------------------------------
/ @function:
/ CDXLTranslateContext::CDXLTranslateContext
/
/ @doc:
/ Ctor
/
/---------------------------------------------------------------------------
CDXLTranslateContext::CDXLTranslateContext(CMemoryPool *mp,
BOOL is_child_agg_node)
: m_mp(mp), m_is_child_agg_node(is_child_agg_node)
{
/ initialize hash table
m_colid_to_target_entry_map = GPOS_NEW(m_mp) ULongToTargetEntryMap(m_mp);
m_colid_to_paramid_map = GPOS_NEW(m_mp) ULongToColParamMap(m_mp);
}
/---------------------------------------------------------------------------
/ @function:
/ CDXLTranslateContext::CDXLTranslateContext
/
/ @doc:
/ Ctor
/
/---------------------------------------------------------------------------
CDXLTranslateContext::CDXLTranslateContext(CMemoryPool *mp,
BOOL is_child_agg_node,
ULongToColParamMap *original)
: m_mp(mp), m_is_child_agg_node(is_child_agg_node)
{
m_colid_to_target_entry_map = GPOS_NEW(m_mp) ULongToTargetEntryMap(m_mp);
m_colid_to_paramid_map = GPOS_NEW(m_mp) ULongToColParamMap(m_mp);
CopyParamHashmap(original);
}
/---------------------------------------------------------------------------
/ @function:
/ CDXLTranslateContext::~CDXLTranslateContext
/
/ @doc:
/ Dtor
/
/---------------------------------------------------------------------------
CDXLTranslateContext::~CDXLTranslateContext()
{
m_colid_to_target_entry_map->Release();
m_colid_to_paramid_map->Release();
}
/---------------------------------------------------------------------------
/ @function:
/ CDXLTranslateContext::IsParentAggNode
/
/ @doc:
/ Is this translation context created by a parent Agg node
/
/---------------------------------------------------------------------------
BOOL
CDXLTranslateContext::IsParentAggNode() const
{
return m_is_child_agg_node;
}
/---------------------------------------------------------------------------
/ @function:
/ CDXLTranslateContext::CopyParamHashmap
/
/ @doc:
/ copy the params hashmap
/
/---------------------------------------------------------------------------
void
CDXLTranslateContext::CopyParamHashmap(ULongToColParamMap *original)
{
/ iterate over full map
ULongToColParamMapIter hashmapiter(original);
while (hashmapiter.Advance())
{
CMappingElementColIdParamId *colidparamid =
const_cast<CMappingElementColIdParamId *>(hashmapiter.Value());
const ULONG colid = colidparamid->GetColId();
ULONG *key = GPOS_NEW(m_mp) ULONG(colid);
colidparamid->AddRef();
m_colid_to_paramid_map->Insert(key, colidparamid);
}
}
/---------------------------------------------------------------------------
/ @function:
/ CDXLTranslateContext::GetTargetEntry
/
/ @doc:
/ Lookup target entry associated with a given col id
/
/---------------------------------------------------------------------------
const TargetEntry *
CDXLTranslateContext::GetTargetEntry(ULONG colid) const
{
return m_colid_to_target_entry_map->Find(&colid);
}
/---------------------------------------------------------------------------
/ @function:
/ CDXLTranslateContext::GetParamIdMappingElement
/
/ @doc:
/ Lookup col->param mapping associated with a given col id
/
/---------------------------------------------------------------------------
const CMappingElementColIdParamId *
CDXLTranslateContext::GetParamIdMappingElement(ULONG colid) const
{
return m_colid_to_paramid_map->Find(&colid);
}
/---------------------------------------------------------------------------
/ @function:
/ CDXLTranslateContext::InsertMapping
/
/ @doc:
/ Insert a (col id, target entry) mapping
/
/---------------------------------------------------------------------------
void
CDXLTranslateContext::InsertMapping(ULONG colid, TargetEntry *target_entry)
{
/ copy key
ULONG *key = GPOS_NEW(m_mp) ULONG(colid);
/ insert colid->target entry mapping in the hash map
BOOL result = m_colid_to_target_entry_map->Insert(key, target_entry);
if (!result)
{
GPOS_DELETE(key);
}
}
/---------------------------------------------------------------------------
/ @function:
/ CDXLTranslateContext::FInsertParamMapping
/
/ @doc:
/ Insert a (col id, param id) mapping
/
/---------------------------------------------------------------------------
BOOL
CDXLTranslateContext::FInsertParamMapping(
ULONG colid, CMappingElementColIdParamId *colidparamid)
{
/ copy key
ULONG *key = GPOS_NEW(m_mp) ULONG(colid);
/ insert colid->target entry mapping in the hash map
return m_colid_to_paramid_map->Insert(key, colidparamid);
}
/ EOF
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