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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