greenplumn CParseHandlerSubqueryScan 源码
greenplumn CParseHandlerSubqueryScan 代码
文件路径:/src/backend/gporca/libnaucrates/src/parser/CParseHandlerSubqueryScan.cpp
//---------------------------------------------------------------------------
// Greenplum Database
// Copyright (C) 2011 Greenplum, Inc.
//
// @filename:
// CParseHandlerSubqueryScan.cpp
//
// @doc:
// Implementation of the SAX parse handler class for parsing subquery scan operators.
//---------------------------------------------------------------------------
#include "naucrates/dxl/parser/CParseHandlerSubqueryScan.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/CParseHandlerUtils.h"
using namespace gpdxl;
XERCES_CPP_NAMESPACE_USE
//---------------------------------------------------------------------------
// @function:
// CParseHandlerSubqueryScan::CParseHandlerSubqueryScan
//
// @doc:
// Constructor
//
//---------------------------------------------------------------------------
CParseHandlerSubqueryScan::CParseHandlerSubqueryScan(
CMemoryPool *mp, CParseHandlerManager *parse_handler_mgr,
CParseHandlerBase *parse_handler_root)
: CParseHandlerPhysicalOp(mp, parse_handler_mgr, parse_handler_root),
m_dxl_op(nullptr)
{
}
//---------------------------------------------------------------------------
// @function:
// CParseHandlerSubqueryScan::StartElement
//
// @doc:
// Invoked by Xerces to process an opening tag
//
//---------------------------------------------------------------------------
void
CParseHandlerSubqueryScan::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(EdxltokenPhysicalSubqueryScan),
element_local_name))
{
CWStringDynamic *str = CDXLUtils::CreateDynamicStringFromXMLChArray(
m_parse_handler_mgr->GetDXLMemoryManager(), element_local_name);
GPOS_RAISE(gpdxl::ExmaDXL, gpdxl::ExmiDXLUnexpectedTag,
str->GetBuffer());
}
m_dxl_op =
(CDXLPhysicalSubqueryScan *) CDXLOperatorFactory::MakeDXLSubqScan(
m_parse_handler_mgr->GetDXLMemoryManager(), attrs);
// create child node parsers in reverse order of their expected occurrence
// parse handler for child node
CParseHandlerBase *child_parse_handler =
CParseHandlerFactory::GetParseHandler(
m_mp, CDXLTokens::XmlstrToken(EdxltokenPhysical),
m_parse_handler_mgr, this);
m_parse_handler_mgr->ActivateParseHandler(child_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 child parse handlers in array
this->Append(prop_parse_handler);
this->Append(proj_list_parse_handler);
this->Append(filter_parse_handler);
this->Append(child_parse_handler);
}
//---------------------------------------------------------------------------
// @function:
// CParseHandlerSubqueryScan::EndElement
//
// @doc:
// Invoked by Xerces to process a closing tag
//
//---------------------------------------------------------------------------
void
CParseHandlerSubqueryScan::EndElement(const XMLCh *const, // element_uri,
const XMLCh *const element_local_name,
const XMLCh *const // element_qname
)
{
if (0 != XMLString::compareString(
CDXLTokens::XmlstrToken(EdxltokenPhysicalSubqueryScan),
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]);
CParseHandlerPhysicalOp *child_parse_handler =
dynamic_cast<CParseHandlerPhysicalOp *>((*this)[3]);
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 constructed children
AddChildFromParseHandler(proj_list_parse_handler);
AddChildFromParseHandler(filter_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
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