greenplumn CParseHandlerAgg 代码
文件路径：/src/backend/gporca/libnaucrates/src/parser/CParseHandlerAgg.cpp
/---------------------------------------------------------------------------
/ Greenplum Database
/ Copyright (C) 2010 Greenplum, Inc.
/
/ @filename:
/ CParseHandlerAgg.cpp
/
/ @doc:
/ Implementation of the SAX parse handler class for parsing aggregate operators.
/---------------------------------------------------------------------------
#include "naucrates/dxl/parser/CParseHandlerAgg.h"
#include "naucrates/dxl/operators/CDXLOperatorFactory.h"
#include "naucrates/dxl/parser/CParseHandlerFactory.h"
#include "naucrates/dxl/parser/CParseHandlerFilter.h"
#include "naucrates/dxl/parser/CParseHandlerGroupingColList.h"
#include "naucrates/dxl/parser/CParseHandlerProjList.h"
#include "naucrates/dxl/parser/CParseHandlerProperties.h"
#include "naucrates/dxl/parser/CParseHandlerScalarOp.h"
#include "naucrates/dxl/parser/CParseHandlerUtils.h"
using namespace gpdxl;
XERCES_CPP_NAMESPACE_USE
/---------------------------------------------------------------------------
/ @function:
/ CParseHandlerAgg::CParseHandlerAgg
/
/ @doc:
/ Constructor
/
/---------------------------------------------------------------------------
CParseHandlerAgg::CParseHandlerAgg(CMemoryPool *mp,
CParseHandlerManager *parse_handler_mgr,
CParseHandlerBase *parse_handler_root)
: CParseHandlerPhysicalOp(mp, parse_handler_mgr, parse_handler_root),
m_dxl_op(nullptr)
{
}
/---------------------------------------------------------------------------
/ @function:
/ CParseHandlerAgg::StartElement
/
/ @doc:
/ Invoked by Xerces to process an opening tag
/
/---------------------------------------------------------------------------
void
CParseHandlerAgg::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(EdxltokenPhysicalAggregate),
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 group by operator
m_dxl_op = (CDXLPhysicalAgg *) CDXLOperatorFactory::MakeDXLAgg(
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 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 grouping columns list
CParseHandlerBase *grouping_col_list_parse_handler =
CParseHandlerFactory::GetParseHandler(
m_mp, CDXLTokens::XmlstrToken(EdxltokenScalarGroupingColList),
m_parse_handler_mgr, this);
m_parse_handler_mgr->ActivateParseHandler(grouping_col_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(grouping_col_list_parse_handler);
this->Append(proj_list_parse_handler);
this->Append(filter_parse_handler);
this->Append(child_parse_handler);
}
/---------------------------------------------------------------------------
/ @function:
/ CParseHandlerAgg::EndElement
/
/ @doc:
/ Invoked by Xerces to process a closing tag
/
/---------------------------------------------------------------------------
void
CParseHandlerAgg::EndElement(const XMLCh *const, / element_uri,
const XMLCh *const element_local_name,
const XMLCh *const / element_qname
)
{
if (0 != XMLString::compareString(
CDXLTokens::XmlstrToken(EdxltokenPhysicalAggregate),
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
GPOS_ASSERT(5 == this->Length());
CParseHandlerProperties *prop_parse_handler =
dynamic_cast<CParseHandlerProperties *>((*this)[0]);
CParseHandlerGroupingColList *grouping_col_list_parse_handler =
dynamic_cast<CParseHandlerGroupingColList *>((*this)[1]);
CParseHandlerProjList *proj_list_parse_handler =
dynamic_cast<CParseHandlerProjList *>((*this)[2]);
CParseHandlerFilter *filter_parse_handler =
dynamic_cast<CParseHandlerFilter *>((*this)[3]);
CParseHandlerPhysicalOp *child_parse_handler =
dynamic_cast<CParseHandlerPhysicalOp *>((*this)[4]);
/ set grouping cols list
GPOS_ASSERT(nullptr !=
grouping_col_list_parse_handler->GetGroupingColidArray());
ULongPtrArray *grouping_colid_array =
grouping_col_list_parse_handler->GetGroupingColidArray();
grouping_colid_array->AddRef();
m_dxl_op->SetGroupingCols(grouping_colid_array);
m_dxl_node = GPOS_NEW(m_mp) CDXLNode(m_mp, m_dxl_op);
/ set physical properties
CParseHandlerUtils::SetProperties(m_dxl_node, prop_parse_handler);
/ add children
AddChildFromParseHandler(proj_list_parse_handler);
AddChildFromParseHandler(filter_parse_handler);
AddChildFromParseHandler(child_parse_handler);
/ deactivate handler
m_parse_handler_mgr->DeactivateHandler();
}
/ EOF
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