greenplumn CParseHandlerLogicalGroupBy 代码
文件路径：/src/backend/gporca/libnaucrates/src/parser/CParseHandlerLogicalGroupBy.cpp
/---------------------------------------------------------------------------
/ Greenplum Database
/ Copyright (C) 2011 EMC Corp.
/
/ @filename:
/ CParseHandlerLogicalGroupBy.cpp
/
/ @doc:
/ Implementation of the SAX parse handler class for parsing logical
/ GroupBy operators.
/---------------------------------------------------------------------------
#include "naucrates/dxl/parser/CParseHandlerLogicalGroupBy.h"
#include "naucrates/dxl/operators/CDXLLogicalGroupBy.h"
#include "naucrates/dxl/operators/CDXLOperatorFactory.h"
#include "naucrates/dxl/parser/CParseHandlerFactory.h"
#include "naucrates/dxl/parser/CParseHandlerGroupingColList.h"
#include "naucrates/dxl/parser/CParseHandlerProjList.h"
#include "naucrates/dxl/parser/CParseHandlerScalarOp.h"
using namespace gpdxl;
XERCES_CPP_NAMESPACE_USE
/---------------------------------------------------------------------------
/ @function:
/ CParseHandlerLogicalGroupBy::CParseHandlerLogicalGroupBy
/
/ @doc:
/ Constructor
/
/---------------------------------------------------------------------------
CParseHandlerLogicalGroupBy::CParseHandlerLogicalGroupBy(
CMemoryPool *mp, CParseHandlerManager *parse_handler_mgr,
CParseHandlerBase *parse_handler_root)
: CParseHandlerLogicalOp(mp, parse_handler_mgr, parse_handler_root)
{
}
/---------------------------------------------------------------------------
/ @function:
/ CParseHandlerLogicalGroupBy::StartElement
/
/ @doc:
/ Invoked by Xerces to process an opening tag
/
/---------------------------------------------------------------------------
void
CParseHandlerLogicalGroupBy::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(EdxltokenLogicalGrpBy),
element_local_name))
{
m_dxl_node = GPOS_NEW(m_mp)
CDXLNode(m_mp, GPOS_NEW(m_mp) CDXLLogicalGroupBy(m_mp));
/ create child node parsers
/ parse handler for logical operator
CParseHandlerBase *lg_op_parse_handler =
CParseHandlerFactory::GetParseHandler(
m_mp, CDXLTokens::XmlstrToken(EdxltokenLogical),
m_parse_handler_mgr, this);
m_parse_handler_mgr->ActivateParseHandler(lg_op_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);
/ store child parse handler in array
this->Append(grouping_col_list_parse_handler);
this->Append(proj_list_parse_handler);
this->Append(lg_op_parse_handler);
}
else
{
CWStringDynamic *str = CDXLUtils::CreateDynamicStringFromXMLChArray(
m_parse_handler_mgr->GetDXLMemoryManager(), element_local_name);
GPOS_RAISE(gpdxl::ExmaDXL, gpdxl::ExmiDXLUnexpectedTag,
str->GetBuffer());
}
}
/---------------------------------------------------------------------------
/ @function:
/ CParseHandlerLogicalGroupBy::EndElement
/
/ @doc:
/ Invoked by Xerces to process a closing tag
/
/---------------------------------------------------------------------------
void
CParseHandlerLogicalGroupBy::EndElement(const XMLCh *const, / element_uri,
const XMLCh *const element_local_name,
const XMLCh *const / element_qname
)
{
if (0 !=
XMLString::compareString(CDXLTokens::XmlstrToken(EdxltokenLogicalGrpBy),
element_local_name))
{
CWStringDynamic *str = CDXLUtils::CreateDynamicStringFromXMLChArray(
m_parse_handler_mgr->GetDXLMemoryManager(), element_local_name);
GPOS_RAISE(gpdxl::ExmaDXL, gpdxl::ExmiDXLUnexpectedTag,
str->GetBuffer());
}
GPOS_ASSERT(nullptr != m_dxl_node);
GPOS_ASSERT(3 == this->Length());
CParseHandlerGroupingColList *grouping_col_parse_handler =
dynamic_cast<CParseHandlerGroupingColList *>((*this)[0]);
CParseHandlerProjList *proj_list_parse_handler =
dynamic_cast<CParseHandlerProjList *>((*this)[1]);
CParseHandlerLogicalOp *lg_op_parse_handler =
dynamic_cast<CParseHandlerLogicalOp *>((*this)[2]);
GPOS_ASSERT(nullptr != proj_list_parse_handler->CreateDXLNode());
GPOS_ASSERT(nullptr != lg_op_parse_handler->CreateDXLNode());
AddChildFromParseHandler(proj_list_parse_handler);
AddChildFromParseHandler(lg_op_parse_handler);
CDXLLogicalGroupBy *lg_group_by_dxl =
static_cast<CDXLLogicalGroupBy *>(m_dxl_node->GetOperator());
/ set grouping cols list
GPOS_ASSERT(nullptr != grouping_col_parse_handler->GetGroupingColidArray());
ULongPtrArray *grouping_col_array =
grouping_col_parse_handler->GetGroupingColidArray();
grouping_col_array->AddRef();
lg_group_by_dxl->SetGroupingColumns(grouping_col_array);
#ifdef GPOS_DEBUG
lg_group_by_dxl->AssertValid(m_dxl_node, false /* validate_children */);
#endif / GPOS_DEBUG
/ deactivate handler
m_parse_handler_mgr->DeactivateHandler();
}
/ EOF
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