greenplumn CParseHandlerDistinctComp 代码
文件路径：/src/backend/gporca/libnaucrates/src/parser/CParseHandlerDistinctComp.cpp
/---------------------------------------------------------------------------
/ Greenplum Database
/ Copyright (C) 2011 Greenplum, Inc.
/
/ @filename:
/ CParseHandlerDistinctComp.cpp
/
/ @doc:
/ Implementation of the SAX parse handler class for parsing distinct
/ comparison operators.
/---------------------------------------------------------------------------
#include "naucrates/dxl/parser/CParseHandlerDistinctComp.h"
#include "naucrates/dxl/operators/CDXLOperatorFactory.h"
#include "naucrates/dxl/parser/CParseHandlerFactory.h"
#include "naucrates/dxl/parser/CParseHandlerScalarOp.h"
using namespace gpdxl;
XERCES_CPP_NAMESPACE_USE
/---------------------------------------------------------------------------
/ @function:
/ CParseHandlerDistinctComp::CParseHandlerDistinctComp
/
/ @doc:
/ Constructor
/
/---------------------------------------------------------------------------
CParseHandlerDistinctComp::CParseHandlerDistinctComp(
CMemoryPool *mp, CParseHandlerManager *parse_handler_mgr,
CParseHandlerBase *parse_handler_root)
: CParseHandlerScalarOp(mp, parse_handler_mgr, parse_handler_root),
m_dxl_op(nullptr)
{
}
/---------------------------------------------------------------------------
/ @function:
/ CParseHandlerDistinctComp::StartElement
/
/ @doc:
/ Processes a Xerces start element event
/
/---------------------------------------------------------------------------
void
CParseHandlerDistinctComp::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(EdxltokenScalarDistinctComp),
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 distinct operator
m_dxl_op =
(CDXLScalarDistinctComp *) CDXLOperatorFactory::MakeDXLDistinctCmp(
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 right scalar node
CParseHandlerBase *right_child_parse_handler =
CParseHandlerFactory::GetParseHandler(
m_mp, CDXLTokens::XmlstrToken(EdxltokenScalar), m_parse_handler_mgr,
this);
m_parse_handler_mgr->ActivateParseHandler(right_child_parse_handler);
/ parse handler for left scalar node
CParseHandlerBase *left_child_parse_handler =
CParseHandlerFactory::GetParseHandler(
m_mp, CDXLTokens::XmlstrToken(EdxltokenScalar), m_parse_handler_mgr,
this);
m_parse_handler_mgr->ActivateParseHandler(left_child_parse_handler);
/ store parse handlers
this->Append(left_child_parse_handler);
this->Append(right_child_parse_handler);
}
/---------------------------------------------------------------------------
/ @function:
/ CParseHandlerDistinctComp::EndElement
/
/ @doc:
/ Processes a Xerces end element event
/
/---------------------------------------------------------------------------
void
CParseHandlerDistinctComp::EndElement(const XMLCh *const, / element_uri,
const XMLCh *const element_local_name,
const XMLCh *const / element_qname
)
{
if (0 != XMLString::compareString(
CDXLTokens::XmlstrToken(EdxltokenScalarDistinctComp),
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
m_dxl_node = GPOS_NEW(m_mp) CDXLNode(m_mp, m_dxl_op);
CParseHandlerScalarOp *left_child_parse_handler =
dynamic_cast<CParseHandlerScalarOp *>((*this)[0]);
CParseHandlerScalarOp *right_child_parse_handler =
dynamic_cast<CParseHandlerScalarOp *>((*this)[1]);
/ add constructed children
AddChildFromParseHandler(left_child_parse_handler);
AddChildFromParseHandler(right_child_parse_handler);
/ deactivate handler
m_parse_handler_mgr->DeactivateHandler();
}
/ EOF
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