greenplumn CParseHandlerLogicalSetOp 代码
文件路径：/src/backend/gporca/libnaucrates/src/parser/CParseHandlerLogicalSetOp.cpp
/---------------------------------------------------------------------------
/ Greenplum Database
/ Copyright (C) 2012 EMC Corp.
/
/ @filename:
/ CParseHandlerLogicalSetOp.cpp
/
/ @doc:
/ Implementation of the SAX parse handler class for parsing logical
/ set operators.
/
/ @owner:
/
/
/ @test:
/
/---------------------------------------------------------------------------
#include "naucrates/dxl/parser/CParseHandlerLogicalSetOp.h"
#include "naucrates/dxl/operators/CDXLOperatorFactory.h"
#include "naucrates/dxl/parser/CParseHandlerColDescr.h"
#include "naucrates/dxl/parser/CParseHandlerFactory.h"
using namespace gpdxl;
XERCES_CPP_NAMESPACE_USE
/---------------------------------------------------------------------------
/ @function:
/ CParseHandlerLogicalSetOp::CParseHandlerLogicalSetOp
/
/ @doc:
/ Ctor
/
/---------------------------------------------------------------------------
CParseHandlerLogicalSetOp::CParseHandlerLogicalSetOp(
CMemoryPool *mp, CParseHandlerManager *parse_handler_mgr,
CParseHandlerBase *parse_handler_root)
: CParseHandlerLogicalOp(mp, parse_handler_mgr, parse_handler_root),
m_setop_type(EdxlsetopSentinel),
m_input_colids_arrays(nullptr),
m_cast_across_input_req(false)
{
}
/---------------------------------------------------------------------------
/ @function:
/ CParseHandlerLogicalSetOp::~CParseHandlerLogicalSetOp
/
/ @doc:
/ Dtor
/
/---------------------------------------------------------------------------
CParseHandlerLogicalSetOp::~CParseHandlerLogicalSetOp() = default;
/---------------------------------------------------------------------------
/ @function:
/ CParseHandlerLogicalSetOp::StartElement
/
/ @doc:
/ Invoked by Xerces to process an opening tag
/
/---------------------------------------------------------------------------
void
CParseHandlerLogicalSetOp::StartElement(const XMLCh *const element_uri,
const XMLCh *const element_local_name,
const XMLCh *const element_qname,
const Attributes &attrs)
{
if (0 == this->Length())
{
m_setop_type = GetSetOpType(element_local_name);
if (EdxlsetopSentinel == m_setop_type)
{
GPOS_RAISE(gpdxl::ExmaDXL, gpdxl::ExmiDXLUnexpectedTag,
CDXLUtils::CreateDynamicStringFromXMLChArray(
m_parse_handler_mgr->GetDXLMemoryManager(),
element_local_name)
->GetBuffer());
}
/ parse array of input colid arrays
const XMLCh *input_colids_array_str =
attrs.getValue(CDXLTokens::XmlstrToken(EdxltokenInputCols));
m_input_colids_arrays =
CDXLOperatorFactory::ExtractConvertUlongTo2DArray(
m_parse_handler_mgr->GetDXLMemoryManager(),
input_colids_array_str, EdxltokenInputCols,
EdxltokenLogicalSetOperation);
/ install column descriptor parsers
CParseHandlerBase *col_descr_parse_handler =
CParseHandlerFactory::GetParseHandler(
m_mp, CDXLTokens::XmlstrToken(EdxltokenColumns),
m_parse_handler_mgr, this);
m_parse_handler_mgr->ActivateParseHandler(col_descr_parse_handler);
m_cast_across_input_req =
CDXLOperatorFactory::ExtractConvertAttrValueToBool(
m_parse_handler_mgr->GetDXLMemoryManager(), attrs,
EdxltokenCastAcrossInputs, EdxltokenLogicalSetOperation);
/ store child parse handler in array
this->Append(col_descr_parse_handler);
}
else
{
/ already have seen a set operation
GPOS_ASSERT(EdxlsetopSentinel != m_setop_type);
/ create child node parsers
CParseHandlerBase *child_parse_handler =
CParseHandlerFactory::GetParseHandler(
m_mp, CDXLTokens::XmlstrToken(EdxltokenLogical),
m_parse_handler_mgr, this);
m_parse_handler_mgr->ActivateParseHandler(child_parse_handler);
this->Append(child_parse_handler);
child_parse_handler->startElement(element_uri, element_local_name,
element_qname, attrs);
}
}
/---------------------------------------------------------------------------
/ @function:
/ CParseHandlerLogicalSetOp::GetSetOpType
/
/ @doc:
/ Invoked by Xerces to process a closing tag
/
/---------------------------------------------------------------------------
EdxlSetOpType
CParseHandlerLogicalSetOp::GetSetOpType(const XMLCh *const element_local_name)
{
if (0 ==
XMLString::compareString(CDXLTokens::XmlstrToken(EdxltokenLogicalUnion),
element_local_name))
{
return EdxlsetopUnion;
}
if (0 == XMLString::compareString(
CDXLTokens::XmlstrToken(EdxltokenLogicalUnionAll),
element_local_name))
{
return EdxlsetopUnionAll;
}
if (0 == XMLString::compareString(
CDXLTokens::XmlstrToken(EdxltokenLogicalIntersect),
element_local_name))
{
return EdxlsetopIntersect;
}
if (0 == XMLString::compareString(
CDXLTokens::XmlstrToken(EdxltokenLogicalIntersectAll),
element_local_name))
{
return EdxlsetopIntersectAll;
}
if (0 == XMLString::compareString(
CDXLTokens::XmlstrToken(EdxltokenLogicalDifference),
element_local_name))
{
return EdxlsetopDifference;
}
if (0 == XMLString::compareString(
CDXLTokens::XmlstrToken(EdxltokenLogicalDifferenceAll),
element_local_name))
{
return EdxlsetopDifferenceAll;
}
return EdxlsetopSentinel;
}
/---------------------------------------------------------------------------
/ @function:
/ CParseHandlerLogicalSetOp::EndElement
/
/ @doc:
/ Invoked by Xerces to process a closing tag
/
/---------------------------------------------------------------------------
void
CParseHandlerLogicalSetOp::EndElement(const XMLCh *const, / element_uri,
const XMLCh *const element_local_name,
const XMLCh *const / element_qname
)
{
EdxlSetOpType setop_type = GetSetOpType(element_local_name);
if (EdxlsetopSentinel == setop_type && m_setop_type != setop_type)
{
CWStringDynamic *str = CDXLUtils::CreateDynamicStringFromXMLChArray(
m_parse_handler_mgr->GetDXLMemoryManager(), element_local_name);
GPOS_RAISE(gpdxl::ExmaDXL, gpdxl::ExmiDXLUnexpectedTag,
str->GetBuffer());
}
const ULONG length = this->Length();
GPOS_ASSERT(3 <= length);
/ get the columns descriptors
CParseHandlerColDescr *col_descr_parse_handler =
dynamic_cast<CParseHandlerColDescr *>((*this)[0]);
GPOS_ASSERT(nullptr != col_descr_parse_handler->GetDXLColumnDescrArray());
CDXLColDescrArray *cold_descr_dxl_array =
col_descr_parse_handler->GetDXLColumnDescrArray();
cold_descr_dxl_array->AddRef();
CDXLLogicalSetOp *dxl_op = GPOS_NEW(m_mp)
CDXLLogicalSetOp(m_mp, setop_type, cold_descr_dxl_array,
m_input_colids_arrays, m_cast_across_input_req);
m_dxl_node = GPOS_NEW(m_mp) CDXLNode(m_mp, dxl_op);
for (ULONG idx = 1; idx < length; idx++)
{
/ add constructed logical children from child parse handlers
CParseHandlerLogicalOp *child_parse_handler =
dynamic_cast<CParseHandlerLogicalOp *>((*this)[idx]);
AddChildFromParseHandler(child_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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