greenplumn CParseHandlerAppend 代码
文件路径：/src/backend/gporca/libnaucrates/src/parser/CParseHandlerAppend.cpp
/---------------------------------------------------------------------------
/ Greenplum Database
/ Copyright (C) 2011 Greenplum, Inc.
/
/ @filename:
/ CParseHandlerAppend.cpp
/
/ @doc:
/ Implementation of the SAX parse handler class for parsing Append operator.
/---------------------------------------------------------------------------
#include "naucrates/dxl/parser/CParseHandlerAppend.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/CParseHandlerScalarOp.h"
#include "naucrates/dxl/parser/CParseHandlerTableDescr.h"
#include "naucrates/dxl/parser/CParseHandlerUtils.h"
using namespace gpdxl;
XERCES_CPP_NAMESPACE_USE
/---------------------------------------------------------------------------
/ @function:
/ CParseHandlerAppend::CParseHandlerAppend
/
/ @doc:
/ Constructor
/
/---------------------------------------------------------------------------
CParseHandlerAppend::CParseHandlerAppend(
CMemoryPool *mp, CParseHandlerManager *parse_handler_mgr,
CParseHandlerBase *parse_handler_root)
: CParseHandlerPhysicalOp(mp, parse_handler_mgr, parse_handler_root),
m_dxl_op(nullptr)
{
}
/---------------------------------------------------------------------------
/ @function:
/ CParseHandlerAppend::SetupInitialHandlers
/
/ @doc:
/ Setup initial set of handlers for append node
/
/---------------------------------------------------------------------------
void
CParseHandlerAppend::SetupInitialHandlers(const Attributes &attrs)
{
/ seeing a result tag
GPOS_ASSERT(m_dxl_op == nullptr &&
"Append dxl node should not have been created yet");
GPOS_ASSERT(this->Length() == 0 &&
"No handlers should have been added yet");
m_dxl_op = (CDXLPhysicalAppend *) CDXLOperatorFactory::MakeDXLAppend(
m_parse_handler_mgr->GetDXLMemoryManager(), attrs);
/ 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);
CParseHandlerBase *table_descr_parse_handler = nullptr;
if (m_dxl_op->GetScanId() != gpos::ulong_max)
{
/ parse handler for table descriptor
table_descr_parse_handler = CParseHandlerFactory::GetParseHandler(
m_mp, CDXLTokens::XmlstrToken(EdxltokenTableDescr),
m_parse_handler_mgr, this);
m_parse_handler_mgr->ActivateParseHandler(table_descr_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);
this->Append(prop_parse_handler);
if (m_dxl_op->GetScanId() != gpos::ulong_max)
{
GPOS_ASSERT(nullptr != table_descr_parse_handler);
this->Append(table_descr_parse_handler);
}
this->Append(proj_list_parse_handler);
this->Append(filter_parse_handler);
}
/---------------------------------------------------------------------------
/ @function:
/ CParseHandlerAppend::StartElement
/
/ @doc:
/ Invoked by Xerces to process an opening tag
/
/---------------------------------------------------------------------------
void
CParseHandlerAppend::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(EdxltokenPhysicalAppend),
element_local_name) &&
nullptr == m_dxl_op)
{
/ open a root Append element
SetupInitialHandlers(attrs);
}
else if (nullptr != m_dxl_op)
{
/ install a parse handler for a 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);
this->Append(child_parse_handler);
child_parse_handler->startElement(element_uri, element_local_name,
element_qname, attrs);
}
else
{
CWStringDynamic *str = CDXLUtils::CreateDynamicStringFromXMLChArray(
m_parse_handler_mgr->GetDXLMemoryManager(), element_local_name);
GPOS_RAISE(gpdxl::ExmaDXL, gpdxl::ExmiDXLUnexpectedTag,
str->GetBuffer());
}
}
/---------------------------------------------------------------------------
/ @function:
/ CParseHandlerAppend::EndElement
/
/ @doc:
/ Invoked by Xerces to process a closing tag
/
/---------------------------------------------------------------------------
void
CParseHandlerAppend::EndElement(const XMLCh *const, / element_uri,
const XMLCh *const element_local_name,
const XMLCh *const / element_qname
)
{
if (0 != XMLString::compareString(
CDXLTokens::XmlstrToken(EdxltokenPhysicalAppend),
element_local_name))
{
CWStringDynamic *str = CDXLUtils::CreateDynamicStringFromXMLChArray(
m_parse_handler_mgr->GetDXLMemoryManager(), element_local_name);
GPOS_RAISE(gpdxl::ExmaDXL, gpdxl::ExmiDXLUnexpectedTag,
str->GetBuffer());
}
ULONG child_index = 0;
/ construct node from the created child nodes
CParseHandlerProperties *prop_parse_handler =
dynamic_cast<CParseHandlerProperties *>((*this)[child_index++]);
if (m_dxl_op->GetScanId() != gpos::ulong_max)
{
CParseHandlerTableDescr *table_descr_parse_handler =
dynamic_cast<CParseHandlerTableDescr *>((*this)[child_index++]);
CDXLTableDescr *table_descr =
table_descr_parse_handler->GetDXLTableDescr();
table_descr->AddRef();
m_dxl_op->SetDXLTableDesc(table_descr);
}
CParseHandlerProjList *proj_list_parse_handler =
dynamic_cast<CParseHandlerProjList *>((*this)[child_index++]);
CParseHandlerFilter *filter_parse_handler =
dynamic_cast<CParseHandlerFilter *>((*this)[child_index++]);
m_dxl_node = GPOS_NEW(m_mp) CDXLNode(m_mp, m_dxl_op);
CParseHandlerUtils::SetProperties(m_dxl_node, prop_parse_handler);
/ add constructed children
AddChildFromParseHandler(proj_list_parse_handler);
AddChildFromParseHandler(filter_parse_handler);
GPOS_ASSERT(3 <= this->Length());
const ULONG length = this->Length();
/ an append node can have variable number of children: add them one by one from the respective parse handlers
for (; child_index < length; ++child_index)
{
CParseHandlerPhysicalOp *child_parse_handler =
dynamic_cast<CParseHandlerPhysicalOp *>((*this)[child_index]);
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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