greenplumn CParseHandlerScalarSubqueryQuantified 源码

greenplumn CParseHandlerScalarSubqueryQuantified 代码

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

//---------------------------------------------------------------------------
//	Greenplum Database
//	Copyright (C) 2011 EMC Corp.
//
//	@filename:
//		CParseHandlerScalarSubqueryQuantified.cpp
//
//	@doc:
//		Implementation of the SAX parse handler class for ANY and ALL subquery
//		operators.
//---------------------------------------------------------------------------

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

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

using namespace gpdxl;


XERCES_CPP_NAMESPACE_USE

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


//---------------------------------------------------------------------------
//	@function:
//		CParseHandlerScalarSubqueryQuantified::StartElement
//
//	@doc:
//		Invoked by Xerces to process an opening tag
//
//---------------------------------------------------------------------------
void
CParseHandlerScalarSubqueryQuantified::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);

	// is this a subquery any or subquery all operator
	Edxltoken dxl_token = EdxltokenScalarSubqueryAll;
	if (0 == XMLString::compareString(
				 CDXLTokens::XmlstrToken(EdxltokenScalarSubqueryAny),
				 element_local_name))
	{
		dxl_token = EdxltokenScalarSubqueryAny;
	}
	else if (0 != XMLString::compareString(
					  CDXLTokens::XmlstrToken(EdxltokenScalarSubqueryAll),
					  element_local_name))
	{
		CWStringDynamic *str = CDXLUtils::CreateDynamicStringFromXMLChArray(
			m_parse_handler_mgr->GetDXLMemoryManager(), element_local_name);
		GPOS_RAISE(gpdxl::ExmaDXL, gpdxl::ExmiDXLUnexpectedTag,
				   str->GetBuffer());
	}

	// parse operator id
	IMDId *mdid_op = CDXLOperatorFactory::ExtractConvertAttrValueToMdId(
		m_parse_handler_mgr->GetDXLMemoryManager(), attrs, EdxltokenOpNo,
		dxl_token);

	// parse operator name
	const XMLCh *xmlszScalarOpName = CDXLOperatorFactory::ExtractAttrValue(
		attrs, EdxltokenOpName, dxl_token);

	CWStringDynamic *op_name_str = CDXLUtils::CreateDynamicStringFromXMLChArray(
		m_parse_handler_mgr->GetDXLMemoryManager(), xmlszScalarOpName);
	CMDName *md_op_name = GPOS_NEW(m_mp) CMDName(m_mp, op_name_str);
	GPOS_DELETE(op_name_str);

	// parse column id
	ULONG colid = CDXLOperatorFactory::ExtractConvertAttrValueToUlong(
		m_parse_handler_mgr->GetDXLMemoryManager(), attrs, EdxltokenColId,
		dxl_token);

	if (EdxltokenScalarSubqueryAny == dxl_token)
	{
		m_dxl_op = GPOS_NEW(m_mp)
			CDXLScalarSubqueryAny(m_mp, mdid_op, md_op_name, colid);
	}
	else
	{
		m_dxl_op = GPOS_NEW(m_mp)
			CDXLScalarSubqueryAll(m_mp, mdid_op, md_op_name, colid);
	}

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

	CParseHandlerBase *parse_handler_scalar_child =
		CParseHandlerFactory::GetParseHandler(
			m_mp, CDXLTokens::XmlstrToken(EdxltokenScalar), m_parse_handler_mgr,
			this);
	m_parse_handler_mgr->ActivateParseHandler(parse_handler_scalar_child);

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

//---------------------------------------------------------------------------
//	@function:
//		CParseHandlerScalarSubqueryQuantified::EndElement
//
//	@doc:
//		Invoked by Xerces to process a closing tag
//
//---------------------------------------------------------------------------
void
CParseHandlerScalarSubqueryQuantified::EndElement(
	const XMLCh *const,	 // element_uri,
	const XMLCh *const element_local_name,
	const XMLCh *const	// element_qname
)
{
	if (0 != XMLString::compareString(
				 CDXLTokens::XmlstrToken(EdxltokenScalarSubqueryAll),
				 element_local_name) &&
		0 != XMLString::compareString(
				 CDXLTokens::XmlstrToken(EdxltokenScalarSubqueryAny),
				 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(2 == this->Length());

	CParseHandlerScalarOp *parse_handler_scalar_child =
		dynamic_cast<CParseHandlerScalarOp *>((*this)[0]);
	CParseHandlerLogicalOp *parse_handler_logical_child =
		dynamic_cast<CParseHandlerLogicalOp *>((*this)[1]);

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

	// add constructed child
	AddChildFromParseHandler(parse_handler_scalar_child);
	AddChildFromParseHandler(parse_handler_logical_child);

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

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

// EOF

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