greenplumn CParseHandlerSort 代码
文件路径：/src/backend/gporca/libnaucrates/src/parser/CParseHandlerSort.cpp
/---------------------------------------------------------------------------
/ Greenplum Database
/ Copyright (C) 2011 Greenplum, Inc.
/
/ @filename:
/ CParseHandlerSort.cpp
/
/ @doc:
/ Implementation of the SAX parse handler class for parsing sort operators.
/---------------------------------------------------------------------------
#include "naucrates/dxl/parser/CParseHandlerSort.h"
#include "naucrates/dxl/operators/CDXLOperatorFactory.h"
#include "naucrates/dxl/parser/CParseHandlerFactory.h"
#include "naucrates/dxl/parser/CParseHandlerFilter.h"
#include "naucrates/dxl/parser/CParseHandlerProjList.h"
#include "naucrates/dxl/parser/CParseHandlerProperties.h"
#include "naucrates/dxl/parser/CParseHandlerScalarLimitCount.h"
#include "naucrates/dxl/parser/CParseHandlerScalarLimitOffset.h"
#include "naucrates/dxl/parser/CParseHandlerSortColList.h"
#include "naucrates/dxl/parser/CParseHandlerUtils.h"
using namespace gpdxl;
XERCES_CPP_NAMESPACE_USE
/---------------------------------------------------------------------------
/ @function:
/ CParseHandlerSort::CParseHandlerSort
/
/ @doc:
/ Constructor
/
/---------------------------------------------------------------------------
CParseHandlerSort::CParseHandlerSort(CMemoryPool *mp,
CParseHandlerManager *parse_handler_mgr,
CParseHandlerBase *parse_handler_root)
: CParseHandlerPhysicalOp(mp, parse_handler_mgr, parse_handler_root),
m_dxl_op(nullptr)
{
}
/---------------------------------------------------------------------------
/ @function:
/ CParseHandlerSort::StartElement
/
/ @doc:
/ Invoked by Xerces to process an opening tag
/
/---------------------------------------------------------------------------
void
CParseHandlerSort::StartElement(const XMLCh *const, / element_uri,
const XMLCh *const element_local_name,
const XMLCh *const, / element_qname
const Attributes &attrs)
{
if (0 !=
XMLString::compareString(CDXLTokens::XmlstrToken(EdxltokenPhysicalSort),
element_local_name))
{
CWStringDynamic *str = CDXLUtils::CreateDynamicStringFromXMLChArray(
m_parse_handler_mgr->GetDXLMemoryManager(), element_local_name);
GPOS_RAISE(gpdxl::ExmaDXL, gpdxl::ExmiDXLUnexpectedTag,
str->GetBuffer());
}
/ parse and create Sort operator
m_dxl_op = (CDXLPhysicalSort *) CDXLOperatorFactory::MakeDXLSort(
m_parse_handler_mgr->GetDXLMemoryManager(), attrs);
/ create and activate the parse handler for the children nodes in reverse
/ order of their expected appearance
/ parse handler for the child
CParseHandlerBase *child_parse_handler =
CParseHandlerFactory::GetParseHandler(
m_mp, CDXLTokens::XmlstrToken(EdxltokenPhysical),
m_parse_handler_mgr, this);
m_parse_handler_mgr->ActivateParseHandler(child_parse_handler);
/ create parse handlers for the limit count and offset expressions
CParseHandlerBase *offset_parse_handler =
CParseHandlerFactory::GetParseHandler(
m_mp, CDXLTokens::XmlstrToken(EdxltokenScalarLimitOffset),
m_parse_handler_mgr, this);
m_parse_handler_mgr->ActivateParseHandler(offset_parse_handler);
CParseHandlerBase *count_parse_handler =
CParseHandlerFactory::GetParseHandler(
m_mp, CDXLTokens::XmlstrToken(EdxltokenScalarLimitCount),
m_parse_handler_mgr, this);
m_parse_handler_mgr->ActivateParseHandler(count_parse_handler);
/ parse handler for the sorting column list
CParseHandlerBase *sort_col_list_parse_handler =
CParseHandlerFactory::GetParseHandler(
m_mp, CDXLTokens::XmlstrToken(EdxltokenScalarSortColList),
m_parse_handler_mgr, this);
m_parse_handler_mgr->ActivateParseHandler(sort_col_list_parse_handler);
/ parse handler for the filter
CParseHandlerBase *filter_parse_handler =
CParseHandlerFactory::GetParseHandler(
m_mp, CDXLTokens::XmlstrToken(EdxltokenScalarFilter),
m_parse_handler_mgr, this);
m_parse_handler_mgr->ActivateParseHandler(filter_parse_handler);
/ parse handler for the proj list
CParseHandlerBase *proj_list_parse_handler =
CParseHandlerFactory::GetParseHandler(
m_mp, CDXLTokens::XmlstrToken(EdxltokenScalarProjList),
m_parse_handler_mgr, this);
m_parse_handler_mgr->ActivateParseHandler(proj_list_parse_handler);
/parse handler for the properties of the operator
CParseHandlerBase *prop_parse_handler =
CParseHandlerFactory::GetParseHandler(
m_mp, CDXLTokens::XmlstrToken(EdxltokenProperties),
m_parse_handler_mgr, this);
m_parse_handler_mgr->ActivateParseHandler(prop_parse_handler);
/ store parse handlers
this->Append(prop_parse_handler);
this->Append(proj_list_parse_handler);
this->Append(filter_parse_handler);
this->Append(sort_col_list_parse_handler);
this->Append(count_parse_handler);
this->Append(offset_parse_handler);
this->Append(child_parse_handler);
}
/---------------------------------------------------------------------------
/ @function:
/ CParseHandlerSort::EndElement
/
/ @doc:
/ Invoked by Xerces to process a closing tag
/
/---------------------------------------------------------------------------
void
CParseHandlerSort::EndElement(const XMLCh *const, / element_uri,
const XMLCh *const element_local_name,
const XMLCh *const / element_qname
)
{
if (0 !=
XMLString::compareString(CDXLTokens::XmlstrToken(EdxltokenPhysicalSort),
element_local_name))
{
CWStringDynamic *str = CDXLUtils::CreateDynamicStringFromXMLChArray(
m_parse_handler_mgr->GetDXLMemoryManager(), element_local_name);
GPOS_RAISE(gpdxl::ExmaDXL, gpdxl::ExmiDXLUnexpectedTag,
str->GetBuffer());
}
/ construct node from the created child nodes
CParseHandlerProperties *prop_parse_handler =
dynamic_cast<CParseHandlerProperties *>((*this)[0]);
CParseHandlerProjList *proj_list_parse_handler =
dynamic_cast<CParseHandlerProjList *>((*this)[1]);
CParseHandlerFilter *filter_parse_handler =
dynamic_cast<CParseHandlerFilter *>((*this)[2]);
CParseHandlerSortColList *sort_col_list_parse_handler =
dynamic_cast<CParseHandlerSortColList *>((*this)[3]);
CParseHandlerScalarLimitCount *count_parse_handler =
dynamic_cast<CParseHandlerScalarLimitCount *>((*this)[4]);
CParseHandlerScalarLimitOffset *offset_parse_handler =
dynamic_cast<CParseHandlerScalarLimitOffset *>((*this)[5]);
CParseHandlerPhysicalOp *child_parse_handler =
dynamic_cast<CParseHandlerPhysicalOp *>((*this)[6]);
m_dxl_node = GPOS_NEW(m_mp) CDXLNode(m_mp, m_dxl_op);
/ set statictics and physical properties
CParseHandlerUtils::SetProperties(m_dxl_node, prop_parse_handler);
/ add children
AddChildFromParseHandler(proj_list_parse_handler);
AddChildFromParseHandler(filter_parse_handler);
AddChildFromParseHandler(sort_col_list_parse_handler);
AddChildFromParseHandler(count_parse_handler);
AddChildFromParseHandler(offset_parse_handler);
AddChildFromParseHandler(child_parse_handler);
#ifdef GPOS_DEBUG
m_dxl_op->AssertValid(m_dxl_node, false /* validate_children */);
#endif / GPOS_DEBUG
/ deactivate handler
m_parse_handler_mgr->DeactivateHandler();
}
/ EOF
相关信息
相关文章
greenplumn CParseHandlerAgg 源码
greenplumn CParseHandlerAppend 源码
greenplumn CParseHandlerArray 源码
greenplumn CParseHandlerAssert 源码
greenplumn CParseHandlerBase 源码
greenplumn CParseHandlerBroadcastMotion 源码
greenplumn CParseHandlerCTEConfig 源码
greenplumn CParseHandlerCTEList 源码