greenplumn CParseHandlerScalarSubPlan 代码
文件路径：/src/backend/gporca/libnaucrates/src/parser/CParseHandlerScalarSubPlan.cpp
/---------------------------------------------------------------------------
/ Greenplum Database
/ Copyright (C) 2012 EMC Corp.
/
/ @filename:
/ CParseHandlerScalarSubPlan.cpp
/
/ @doc:
/
/ Implementation of the SAX parse handler class for parsing scalar SubPlan
/---------------------------------------------------------------------------
#include "naucrates/dxl/parser/CParseHandlerScalarSubPlan.h"
#include "naucrates/dxl/CDXLUtils.h"
#include "naucrates/dxl/operators/CDXLOperatorFactory.h"
#include "naucrates/dxl/operators/CDXLScalarSubPlan.h"
#include "naucrates/dxl/parser/CParseHandlerFactory.h"
#include "naucrates/dxl/parser/CParseHandlerPhysicalOp.h"
#include "naucrates/dxl/parser/CParseHandlerScalarOp.h"
#include "naucrates/dxl/parser/CParseHandlerScalarSubPlanParamList.h"
#include "naucrates/dxl/parser/CParseHandlerScalarSubPlanTestExpr.h"
using namespace gpdxl;
XERCES_CPP_NAMESPACE_USE
/---------------------------------------------------------------------------
/ @function:
/ CParseHandlerScalarSubPlan::CParseHandlerScalarSubPlan
/
/ @doc:
/ Ctor
/
/---------------------------------------------------------------------------
CParseHandlerScalarSubPlan::CParseHandlerScalarSubPlan(
CMemoryPool *mp, CParseHandlerManager *parse_handler_mgr,
CParseHandlerBase *parse_handler_root)
: CParseHandlerScalarOp(mp, parse_handler_mgr, parse_handler_root),
m_mdid_first_col(nullptr),
m_dxl_subplan_type(EdxlSubPlanTypeSentinel)
{
}
/---------------------------------------------------------------------------
/ @function:
/ CParseHandlerScalarSubPlan::Edxlsubplantype
/
/ @doc:
/ Map character sequence to subplan type
/
/---------------------------------------------------------------------------
EdxlSubPlanType
CParseHandlerScalarSubPlan::GetDXLSubplanType(const XMLCh *xml_subplan_type)
{
GPOS_ASSERT(nullptr != xml_subplan_type);
if (0 == XMLString::compareString(
CDXLTokens::XmlstrToken(EdxltokenScalarSubPlanTypeScalar),
xml_subplan_type))
{
return EdxlSubPlanTypeScalar;
}
if (0 == XMLString::compareString(
CDXLTokens::XmlstrToken(EdxltokenScalarSubPlanTypeExists),
xml_subplan_type))
{
return EdxlSubPlanTypeExists;
}
if (0 == XMLString::compareString(
CDXLTokens::XmlstrToken(EdxltokenScalarSubPlanTypeNotExists),
xml_subplan_type))
{
return EdxlSubPlanTypeNotExists;
}
if (0 == XMLString::compareString(
CDXLTokens::XmlstrToken(EdxltokenScalarSubPlanTypeAny),
xml_subplan_type))
{
return EdxlSubPlanTypeAny;
}
if (0 == XMLString::compareString(
CDXLTokens::XmlstrToken(EdxltokenScalarSubPlanTypeAll),
xml_subplan_type))
{
return EdxlSubPlanTypeAll;
}
/ turn Xerces exception in optimizer exception
GPOS_RAISE(
gpdxl::ExmaDXL, gpdxl::ExmiDXLInvalidAttributeValue,
CDXLTokens::GetDXLTokenStr(EdxltokenScalarSubPlanType)->GetBuffer(),
CDXLTokens::GetDXLTokenStr(EdxltokenScalarSubPlan)->GetBuffer());
return EdxlSubPlanTypeSentinel;
}
/---------------------------------------------------------------------------
/ @function:
/ CParseHandlerScalarSubPlan::StartElement
/
/ @doc:
/ Processes a Xerces start element event
/
/---------------------------------------------------------------------------
void
CParseHandlerScalarSubPlan::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(EdxltokenScalarSubPlan),
element_local_name))
{
CWStringDynamic *str = CDXLUtils::CreateDynamicStringFromXMLChArray(
m_parse_handler_mgr->GetDXLMemoryManager(), element_local_name);
GPOS_RAISE(gpdxl::ExmaDXL, gpdxl::ExmiDXLUnexpectedTag,
str->GetBuffer());
}
m_mdid_first_col = CDXLOperatorFactory::ExtractConvertAttrValueToMdId(
m_parse_handler_mgr->GetDXLMemoryManager(), attrs, EdxltokenTypeId,
EdxltokenScalarSubPlanParam);
const XMLCh *xmlszSubplanType = CDXLOperatorFactory::ExtractAttrValue(
attrs, EdxltokenScalarSubPlanType, EdxltokenScalarSubPlan);
m_dxl_subplan_type = GetDXLSubplanType(xmlszSubplanType);
/ parse handler for child physical 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 params
CParseHandlerBase *pphParamList = CParseHandlerFactory::GetParseHandler(
m_mp, CDXLTokens::XmlstrToken(EdxltokenScalarSubPlanParamList),
m_parse_handler_mgr, this);
m_parse_handler_mgr->ActivateParseHandler(pphParamList);
/ parse handler for test expression
CParseHandlerBase *pphTestExpr = CParseHandlerFactory::GetParseHandler(
m_mp, CDXLTokens::XmlstrToken(EdxltokenScalarSubPlanTestExpr),
m_parse_handler_mgr, this);
m_parse_handler_mgr->ActivateParseHandler(pphTestExpr);
/ store parse handlers
this->Append(pphTestExpr);
this->Append(pphParamList);
this->Append(child_parse_handler);
}
/---------------------------------------------------------------------------
/ @function:
/ CParseHandlerScalarSubPlan::EndElement
/
/ @doc:
/ Processes a Xerces end element event
/
/---------------------------------------------------------------------------
void
CParseHandlerScalarSubPlan::EndElement(const XMLCh *const, / element_uri,
const XMLCh *const element_local_name,
const XMLCh *const / element_qname
)
{
if (0 != XMLString::compareString(
CDXLTokens::XmlstrToken(EdxltokenScalarSubPlan),
element_local_name) &&
nullptr != m_dxl_node)
{
CWStringDynamic *str = CDXLUtils::CreateDynamicStringFromXMLChArray(
m_parse_handler_mgr->GetDXLMemoryManager(), element_local_name);
GPOS_RAISE(gpdxl::ExmaDXL, gpdxl::ExmiDXLUnexpectedTag,
str->GetBuffer());
}
CParseHandlerScalarSubPlanTestExpr *parse_handler_subplan_test_expr =
dynamic_cast<CParseHandlerScalarSubPlanTestExpr *>((*this)[0]);
CParseHandlerScalarSubPlanParamList *parse_handler_subplan_param_list =
dynamic_cast<CParseHandlerScalarSubPlanParamList *>((*this)[1]);
CParseHandlerPhysicalOp *child_parse_handler =
dynamic_cast<CParseHandlerPhysicalOp *>((*this)[2]);
CDXLColRefArray *dxl_colref_array =
parse_handler_subplan_param_list->GetDXLColRefArray();
dxl_colref_array->AddRef();
CDXLNode *dxl_subplan_test_expr =
parse_handler_subplan_test_expr->GetDXLTestExpr();
if (nullptr != dxl_subplan_test_expr)
{
dxl_subplan_test_expr->AddRef();
}
CDXLScalarSubPlan *dxl_op =
(CDXLScalarSubPlan *) CDXLOperatorFactory::MakeDXLSubPlan(
m_parse_handler_mgr->GetDXLMemoryManager(), m_mdid_first_col,
dxl_colref_array, m_dxl_subplan_type, dxl_subplan_test_expr);
m_dxl_node = GPOS_NEW(m_mp) CDXLNode(m_mp, dxl_op);
/ add constructed children
AddChildFromParseHandler(child_parse_handler);
/ deactivate handler
m_parse_handler_mgr->DeactivateHandler();
}
/ EOF
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