greenplumn CParseHandlerScalarSubqueryExists 源码

  • 2022-08-18
  • 浏览 (57)

greenplumn CParseHandlerScalarSubqueryExists 代码

文件路径:/src/backend/gporca/libnaucrates/src/parser/CParseHandlerScalarSubqueryExists.cpp

//---------------------------------------------------------------------------
//	Greenplum Database
//	Copyright (C) 2011 EMC Corp.
//
//	@filename:
//		CParseHandlerScalarSubqueryExists.cpp
//
//	@doc:
//		Implementation of the SAX parse handler class for parsing EXISTS and NOT EXISTS
//		 subquery operators.
//---------------------------------------------------------------------------

#include "naucrates/dxl/parser/CParseHandlerScalarSubqueryExists.h"

#include "naucrates/dxl/operators/CDXLOperatorFactory.h"
#include "naucrates/dxl/operators/CDXLScalarSubqueryNotExists.h"
#include "naucrates/dxl/parser/CParseHandlerFactory.h"
#include "naucrates/dxl/parser/CParseHandlerLogicalOp.h"

using namespace gpdxl;


XERCES_CPP_NAMESPACE_USE

//---------------------------------------------------------------------------
//	@function:
//		CParseHandlerScalarSubqueryExists::CParseHandlerScalarSubqueryExists
//
//	@doc:
//		Constructor
//
//---------------------------------------------------------------------------
CParseHandlerScalarSubqueryExists::CParseHandlerScalarSubqueryExists(
	CMemoryPool *mp, CParseHandlerManager *parse_handler_mgr,
	CParseHandlerBase *parse_handler_root)
	: CParseHandlerScalarOp(mp, parse_handler_mgr, parse_handler_root),
	  m_dxl_op(nullptr)
{
}


//---------------------------------------------------------------------------
//	@function:
//		CParseHandlerScalarSubqueryExists::StartElement
//
//	@doc:
//		Invoked by Xerces to process an opening tag
//
//---------------------------------------------------------------------------
void
CParseHandlerScalarSubqueryExists::StartElement(
	const XMLCh *const,	 // element_uri,
	const XMLCh *const element_local_name,
	const XMLCh *const,	 // element_qname
	const Attributes &	 // attrs
)
{
	GPOS_ASSERT(nullptr == m_dxl_op);

	if (0 == XMLString::compareString(
				 CDXLTokens::XmlstrToken(EdxltokenScalarSubqueryExists),
				 element_local_name))
	{
		m_dxl_op = GPOS_NEW(m_mp) CDXLScalarSubqueryExists(m_mp);
	}
	else if (0 == XMLString::compareString(
					  CDXLTokens::XmlstrToken(EdxltokenScalarSubqueryNotExists),
					  element_local_name))
	{
		m_dxl_op = GPOS_NEW(m_mp) CDXLScalarSubqueryNotExists(m_mp);
	}
	else
	{
		CWStringDynamic *str = CDXLUtils::CreateDynamicStringFromXMLChArray(
			m_parse_handler_mgr->GetDXLMemoryManager(), element_local_name);
		GPOS_RAISE(gpdxl::ExmaDXL, gpdxl::ExmiDXLUnexpectedTag,
				   str->GetBuffer());
	}

	// parse handler for the child node
	CParseHandlerBase *child_parse_handler =
		CParseHandlerFactory::GetParseHandler(
			m_mp, CDXLTokens::XmlstrToken(EdxltokenLogical),
			m_parse_handler_mgr, this);
	m_parse_handler_mgr->ActivateParseHandler(child_parse_handler);

	// store child parse handler in array
	this->Append(child_parse_handler);
}

//---------------------------------------------------------------------------
//	@function:
//		CParseHandlerScalarSubqueryExists::EndElement
//
//	@doc:
//		Invoked by Xerces to process a closing tag
//
//---------------------------------------------------------------------------
void
CParseHandlerScalarSubqueryExists::EndElement(
	const XMLCh *const,	 // element_uri,
	const XMLCh *const element_local_name,
	const XMLCh *const	// element_qname
)
{
	if (0 != XMLString::compareString(
				 CDXLTokens::XmlstrToken(EdxltokenScalarSubqueryExists),
				 element_local_name) &&
		0 != XMLString::compareString(
				 CDXLTokens::XmlstrToken(EdxltokenScalarSubqueryNotExists),
				 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 parsed components
	GPOS_ASSERT(nullptr != m_dxl_op);
	GPOS_ASSERT(1 == this->Length());

	CParseHandlerLogicalOp *child_parse_handler =
		dynamic_cast<CParseHandlerLogicalOp *>((*this)[0]);

	m_dxl_node = GPOS_NEW(m_mp) CDXLNode(m_mp, m_dxl_op);

	// add constructed child
	AddChildFromParseHandler(child_parse_handler);

#ifdef GPOS_DEBUG
	m_dxl_op->AssertValid(m_dxl_node, false /* validate_children */);
#endif	// GPOS_DEBUG

	// deactivate handler
	m_parse_handler_mgr->DeactivateHandler();
}

// EOF

相关信息

greenplumn 源码目录

相关文章

greenplumn CParseHandlerAgg 源码

greenplumn CParseHandlerAppend 源码

greenplumn CParseHandlerArray 源码

greenplumn CParseHandlerAssert 源码

greenplumn CParseHandlerBase 源码

greenplumn CParseHandlerBroadcastMotion 源码

greenplumn CParseHandlerCTEConfig 源码

greenplumn CParseHandlerCTEList 源码

greenplumn CParseHandlerColDescr 源码

greenplumn CParseHandlerColStats 源码

0  赞