greenplumn CParseHandlerLogicalJoin 代码
文件路径：/src/backend/gporca/libnaucrates/src/parser/CParseHandlerLogicalJoin.cpp
/---------------------------------------------------------------------------
/ Greenplum Database
/ Copyright (C) 2011 Greenplum, Inc.
/
/ @filename:
/ CParseHandlerLogicalJoin.cpp
/
/ @doc:
/ Implementation of the SAX parse handler class for parsing logical
/ join operators.
/---------------------------------------------------------------------------
#include "naucrates/dxl/parser/CParseHandlerLogicalJoin.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:
/ CParseHandlerLogicalJoin::CParseHandlerLogicalJoin
/
/ @doc:
/ Constructor
/
/---------------------------------------------------------------------------
CParseHandlerLogicalJoin::CParseHandlerLogicalJoin(
CMemoryPool *mp, CParseHandlerManager *parse_handler_mgr,
CParseHandlerBase *parse_handler_root)
: CParseHandlerLogicalOp(mp, parse_handler_mgr, parse_handler_root)
{
}
/---------------------------------------------------------------------------
/ @function:
/ CParseHandlerLogicalJoin::~CParseHandlerLogicalJoin
/
/ @doc:
/ Destructor
/
/---------------------------------------------------------------------------
CParseHandlerLogicalJoin::~CParseHandlerLogicalJoin() = default;
/---------------------------------------------------------------------------
/ @function:
/ CParseHandlerLogicalJoin::StartElement
/
/ @doc:
/ Invoked by Xerces to process an opening tag
/
/---------------------------------------------------------------------------
void
CParseHandlerLogicalJoin::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(EdxltokenLogicalJoin),
element_local_name))
{
if (nullptr == m_dxl_node)
{
/ parse and create logical join operator
CDXLLogicalJoin *pdxlopJoin =
(CDXLLogicalJoin *) CDXLOperatorFactory::MakeLogicalJoin(
m_parse_handler_mgr->GetDXLMemoryManager(), attrs);
/ construct node from the created child nodes
m_dxl_node = GPOS_NEW(m_mp) CDXLNode(m_mp, pdxlopJoin);
}
else
{
/ This is to support nested join.
CParseHandlerBase *lg_join_parse_handler =
CParseHandlerFactory::GetParseHandler(
m_mp, CDXLTokens::XmlstrToken(EdxltokenLogicalJoin),
m_parse_handler_mgr, this);
m_parse_handler_mgr->ActivateParseHandler(lg_join_parse_handler);
/ store parse handlers
this->Append(lg_join_parse_handler);
lg_join_parse_handler->startElement(element_uri, element_local_name,
element_qname, attrs);
}
}
else
{
if (nullptr == m_dxl_node)
{
CWStringDynamic *str = CDXLUtils::CreateDynamicStringFromXMLChArray(
m_parse_handler_mgr->GetDXLMemoryManager(), element_local_name);
GPOS_RAISE(gpdxl::ExmaDXL, gpdxl::ExmiDXLUnexpectedTag,
str->GetBuffer());
}
/ The child can either be a CDXLLogicalOp or CDXLScalar
CParseHandlerBase *child_parse_handler =
CParseHandlerFactory::GetParseHandler(m_mp, element_local_name,
m_parse_handler_mgr, this);
m_parse_handler_mgr->ActivateParseHandler(child_parse_handler);
/ store parse handlers
this->Append(child_parse_handler);
child_parse_handler->startElement(element_uri, element_local_name,
element_qname, attrs);
}
}
/---------------------------------------------------------------------------
/ @function:
/ CParseHandlerLogicalJoin::EndElement
/
/ @doc:
/ Invoked by Xerces to process a closing tag
/
/---------------------------------------------------------------------------
void
CParseHandlerLogicalJoin::EndElement(const XMLCh *const, / element_uri,
const XMLCh *const element_local_name,
const XMLCh *const / element_qname
)
{
if (0 !=
XMLString::compareString(CDXLTokens::XmlstrToken(EdxltokenLogicalJoin),
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);
ULONG num_of_child = this->Length();
/ Joins must atleast have 3 children (2 logical operators and 1 scalar operator)
GPOS_ASSERT(2 < num_of_child);
/ add constructed children from child parse handlers
/ Add the first n-1 logical operator from the first n-1 child parse handler
for (ULONG idx = 0; idx < num_of_child; idx++)
{
CParseHandlerOp *op_parse_handler =
dynamic_cast<CParseHandlerOp *>((*this)[idx]);
GPOS_ASSERT(nullptr != op_parse_handler->CreateDXLNode());
AddChildFromParseHandler(op_parse_handler);
}
#ifdef GPOS_DEBUG
m_dxl_node->GetOperator()->AssertValid(m_dxl_node,
false /* validate_children */);
#endif / GPOS_DEBUG
/ deactivate handler
m_parse_handler_mgr->DeactivateHandler();
}
/ EOF
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