greenplumn CContextQueryToDXL 源码
greenplumn CContextQueryToDXL 代码
文件路径：/src/backend/gpopt/translate/CContextQueryToDXL.cpp
//---------------------------------------------------------------------------
// Greenplum Database
// Copyright (C) 2018-Present VMware, Inc. or its affiliates.
//
// @filename:
// CContextQueryToDXL.cpp
//
// @doc:
// Implementation of the methods used to hold information about
// the whole query, when translate a query into DXL tree. All
// translator methods allocate memory in the provided memory pool,
// and the caller is responsible for freeing it
//
//---------------------------------------------------------------------------
extern "C" {
#include "postgres.h"
}
#include "gpopt/translate/CContextQueryToDXL.h"
#include "gpopt/translate/CTranslatorUtils.h"
#include "naucrates/dxl/CIdGenerator.h"
using namespace gpdxl;
CContextQueryToDXL::CContextQueryToDXL(CMemoryPool *mp)
: m_mp(mp),
m_has_distributed_tables(false),
m_distribution_hashops(DistrHashOpsNotDeterminedYet)
{
// map that stores gpdb att to optimizer col mapping
m_colid_counter = GPOS_NEW(mp) CIdGenerator(GPDXL_COL_ID_START);
m_cte_id_counter = GPOS_NEW(mp) CIdGenerator(GPDXL_CTE_ID_START);
}
CContextQueryToDXL::~CContextQueryToDXL()
{
GPOS_DELETE(m_colid_counter);
GPOS_DELETE(m_cte_id_counter);
}
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