greenplumn CParseHandlerMDGPDBScalarOp 源码

2022-08-18
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greenplumn CParseHandlerMDGPDBScalarOp 代码

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

//---------------------------------------------------------------------------
//	Greenplum Database
//	Copyright (C) 2011 EMC Corp.
//
//	@filename:
//		CParseHandlerMDGPDBScalarOp.cpp
//
//	@doc:
//		Implementation of the SAX parse handler class for parsing metadata for
//		GPDB scalar operators.
//---------------------------------------------------------------------------

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

#include "naucrates/dxl/operators/CDXLOperatorFactory.h"
#include "naucrates/dxl/parser/CParseHandlerFactory.h"
#include "naucrates/dxl/parser/CParseHandlerManager.h"
#include "naucrates/dxl/parser/CParseHandlerMetadataIdList.h"
#include "naucrates/md/CMDScalarOpGPDB.h"

using namespace gpdxl;
using namespace gpmd;


XERCES_CPP_NAMESPACE_USE

//---------------------------------------------------------------------------
//	@function:
//		CParseHandlerMDGPDBScalarOp::CParseHandlerMDGPDBScalarOp
//
//	@doc:
//		Constructor
//
//---------------------------------------------------------------------------
CParseHandlerMDGPDBScalarOp::CParseHandlerMDGPDBScalarOp(
	CMemoryPool *mp, CParseHandlerManager *parse_handler_mgr,
	CParseHandlerBase *parse_handler_root)
	: CParseHandlerMetadataObject(mp, parse_handler_mgr, parse_handler_root),
	  m_mdid(nullptr),
	  m_mdname(nullptr),
	  m_mdid_type_left(nullptr),
	  m_mdid_type_right(nullptr),
	  m_mdid_type_result(nullptr),
	  m_func_mdid(nullptr),
	  m_mdid_commute_opr(nullptr),
	  m_mdid_inverse_opr(nullptr),
	  m_comparision_type(IMDType::EcmptOther),
	  m_returns_null_on_null_input(false),
	  m_mdid_hash_opfamily(nullptr),
	  m_mdid_legacy_hash_opfamily(nullptr),
	  m_is_ndv_preserving(false)
{
}

//---------------------------------------------------------------------------
//	@function:
//		CParseHandlerMDGPDBScalarOp::StartElement
//
//	@doc:
//		Invoked by Xerces to process an opening tag
//
//---------------------------------------------------------------------------
void
CParseHandlerMDGPDBScalarOp::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(EdxltokenGPDBScalarOp),
								 element_local_name))
	{
		// parse operator name
		const XMLCh *xml_str_op_name = CDXLOperatorFactory::ExtractAttrValue(
			attrs, EdxltokenName, EdxltokenGPDBScalarOp);

		CWStringDynamic *str_opname =
			CDXLUtils::CreateDynamicStringFromXMLChArray(
				m_parse_handler_mgr->GetDXLMemoryManager(), xml_str_op_name);

		// create a copy of the string in the CMDName constructor
		m_mdname = GPOS_NEW(m_mp) CMDName(m_mp, str_opname);

		GPOS_DELETE(str_opname);

		// parse metadata id info
		m_mdid = CDXLOperatorFactory::ExtractConvertAttrValueToMdId(
			m_parse_handler_mgr->GetDXLMemoryManager(), attrs, EdxltokenMdid,
			EdxltokenGPDBScalarOp);

		const XMLCh *xml_str_comp_type = CDXLOperatorFactory::ExtractAttrValue(
			attrs, EdxltokenGPDBScalarOpCmpType, EdxltokenGPDBScalarOp);

		m_comparision_type =
			CDXLOperatorFactory::ParseCmpType(xml_str_comp_type);

		// null-returning property is optional
		const XMLCh *xml_str_returns_null_on_null_input = attrs.getValue(
			CDXLTokens::XmlstrToken(EdxltokenReturnsNullOnNullInput));
		if (nullptr != xml_str_returns_null_on_null_input)
		{
			m_returns_null_on_null_input =
				CDXLOperatorFactory::ExtractConvertAttrValueToBool(
					m_parse_handler_mgr->GetDXLMemoryManager(), attrs,
					EdxltokenReturnsNullOnNullInput, EdxltokenGPDBScalarOp);
		}

		// ndv-preserving property is optional
		m_is_ndv_preserving =
			CDXLOperatorFactory::ExtractConvertAttrValueToBool(
				m_parse_handler_mgr->GetDXLMemoryManager(), attrs,
				EdxltokenIsNDVPreserving, EdxltokenGPDBScalarOp,
				true,  // is optional
				false  // default value
			);
	}
	else if (0 == XMLString::compareString(
					  CDXLTokens::XmlstrToken(EdxltokenGPDBScalarOpLeftTypeId),
					  element_local_name))
	{
		// parse left operand's type
		GPOS_ASSERT(nullptr != m_mdname);

		m_mdid_type_left = CDXLOperatorFactory::ExtractConvertAttrValueToMdId(
			m_parse_handler_mgr->GetDXLMemoryManager(), attrs, EdxltokenMdid,
			EdxltokenGPDBScalarOpLeftTypeId);
	}
	else if (0 == XMLString::compareString(
					  CDXLTokens::XmlstrToken(EdxltokenGPDBScalarOpRightTypeId),
					  element_local_name))
	{
		// parse right operand's type
		GPOS_ASSERT(nullptr != m_mdname);

		m_mdid_type_right = CDXLOperatorFactory::ExtractConvertAttrValueToMdId(
			m_parse_handler_mgr->GetDXLMemoryManager(), attrs, EdxltokenMdid,
			EdxltokenGPDBScalarOpRightTypeId);
	}
	else if (0 ==
			 XMLString::compareString(
				 CDXLTokens::XmlstrToken(EdxltokenGPDBScalarOpResultTypeId),
				 element_local_name))
	{
		// parse result type
		GPOS_ASSERT(nullptr != m_mdname);

		m_mdid_type_result = CDXLOperatorFactory::ExtractConvertAttrValueToMdId(
			m_parse_handler_mgr->GetDXLMemoryManager(), attrs, EdxltokenMdid,
			EdxltokenGPDBScalarOpResultTypeId);
	}
	else if (0 == XMLString::compareString(
					  CDXLTokens::XmlstrToken(EdxltokenGPDBScalarOpFuncId),
					  element_local_name))
	{
		// parse op func id
		GPOS_ASSERT(nullptr != m_mdname);

		m_func_mdid = CDXLOperatorFactory::ExtractConvertAttrValueToMdId(
			m_parse_handler_mgr->GetDXLMemoryManager(), attrs, EdxltokenMdid,
			EdxltokenGPDBScalarOpFuncId);
	}
	else if (0 == XMLString::compareString(
					  CDXLTokens::XmlstrToken(EdxltokenGPDBScalarOpCommOpId),
					  element_local_name))
	{
		// parse commutator operator
		GPOS_ASSERT(nullptr != m_mdname);

		m_mdid_commute_opr = CDXLOperatorFactory::ExtractConvertAttrValueToMdId(
			m_parse_handler_mgr->GetDXLMemoryManager(), attrs, EdxltokenMdid,
			EdxltokenGPDBScalarOpCommOpId);
	}
	else if (0 == XMLString::compareString(
					  CDXLTokens::XmlstrToken(EdxltokenGPDBScalarOpInverseOpId),
					  element_local_name))
	{
		// parse inverse operator id
		GPOS_ASSERT(nullptr != m_mdname);

		m_mdid_inverse_opr = CDXLOperatorFactory::ExtractConvertAttrValueToMdId(
			m_parse_handler_mgr->GetDXLMemoryManager(), attrs, EdxltokenMdid,
			EdxltokenGPDBScalarOpInverseOpId);
	}
	else if (0 == XMLString::compareString(
					  CDXLTokens::XmlstrToken(EdxltokenOpfamilies),
					  element_local_name))
	{
		// parse handler for operator class list
		CParseHandlerBase *opfamilies_list_parse_handler =
			CParseHandlerFactory::GetParseHandler(
				m_mp, CDXLTokens::XmlstrToken(EdxltokenMetadataIdList),
				m_parse_handler_mgr, this);
		m_parse_handler_mgr->ActivateParseHandler(
			opfamilies_list_parse_handler);
		this->Append(opfamilies_list_parse_handler);
		opfamilies_list_parse_handler->startElement(
			element_uri, element_local_name, element_qname, attrs);
	}
	else if (0 ==
			 XMLString::compareString(
				 CDXLTokens::XmlstrToken(EdxltokenGPDBScalarOpHashOpfamily),
				 element_local_name))
	{
		// parse inverse operator id
		GPOS_ASSERT(nullptr != m_mdname);

		m_mdid_hash_opfamily =
			CDXLOperatorFactory::ExtractConvertAttrValueToMdId(
				m_parse_handler_mgr->GetDXLMemoryManager(), attrs,
				EdxltokenMdid, EdxltokenGPDBScalarOpHashOpfamily);
	}
	else if (0 == XMLString::compareString(
					  CDXLTokens::XmlstrToken(
						  EdxltokenGPDBScalarOpLegacyHashOpfamily),
					  element_local_name))
	{
		// parse inverse operator id
		GPOS_ASSERT(nullptr != m_mdname);

		m_mdid_legacy_hash_opfamily =
			CDXLOperatorFactory::ExtractConvertAttrValueToMdId(
				m_parse_handler_mgr->GetDXLMemoryManager(), attrs,
				EdxltokenMdid, EdxltokenGPDBScalarOpLegacyHashOpfamily);
	}
	else
	{
		CWStringDynamic *str = CDXLUtils::CreateDynamicStringFromXMLChArray(
			m_parse_handler_mgr->GetDXLMemoryManager(), element_local_name);
		GPOS_RAISE(gpdxl::ExmaDXL, gpdxl::ExmiDXLUnexpectedTag,
				   str->GetBuffer());
	}
}


//---------------------------------------------------------------------------
//	@function:
//		CParseHandlerMDGPDBScalarOp::EndElement
//
//	@doc:
//		Invoked by Xerces to process a closing tag
//
//---------------------------------------------------------------------------
void
CParseHandlerMDGPDBScalarOp::EndElement(const XMLCh *const,	 // element_uri,
										const XMLCh *const element_local_name,
										const XMLCh *const	// element_qname
)
{
	if (0 ==
		XMLString::compareString(CDXLTokens::XmlstrToken(EdxltokenGPDBScalarOp),
								 element_local_name))
	{
		// construct the MD scalar operator object from its part
		GPOS_ASSERT(m_mdid->IsValid() && nullptr != m_mdname);

		GPOS_ASSERT(0 == this->Length() || 1 == this->Length());

		IMdIdArray *mdid_opfamilies_array = nullptr;
		if (0 < this->Length())
		{
			CParseHandlerMetadataIdList *mdid_list_parse_handler =
				dynamic_cast<CParseHandlerMetadataIdList *>((*this)[0]);
			mdid_opfamilies_array = mdid_list_parse_handler->GetMdIdArray();
			mdid_opfamilies_array->AddRef();
		}
		else
		{
			mdid_opfamilies_array = GPOS_NEW(m_mp) IMdIdArray(m_mp);
		}
		m_imd_obj = GPOS_NEW(m_mp)
			CMDScalarOpGPDB(m_mp, m_mdid, m_mdname, m_mdid_type_left,
							m_mdid_type_right, m_mdid_type_result, m_func_mdid,
							m_mdid_commute_opr, m_mdid_inverse_opr,
							m_comparision_type, m_returns_null_on_null_input,
							mdid_opfamilies_array, m_mdid_hash_opfamily,
							m_mdid_legacy_hash_opfamily, m_is_ndv_preserving);

		// deactivate handler
		m_parse_handler_mgr->DeactivateHandler();
	}
	else if (!IsSupportedChildElem(element_local_name))
	{
		CWStringDynamic *str = CDXLUtils::CreateDynamicStringFromXMLChArray(
			m_parse_handler_mgr->GetDXLMemoryManager(), element_local_name);
		GPOS_RAISE(gpdxl::ExmaDXL, gpdxl::ExmiDXLUnexpectedTag,
				   str->GetBuffer());
	}
}


//---------------------------------------------------------------------------
//	@function:
//		CParseHandlerMDGPDBScalarOp::FSupportedElem
//
//	@doc:
//		Is this a supported child elem of the scalar op
//
//---------------------------------------------------------------------------
BOOL
CParseHandlerMDGPDBScalarOp::IsSupportedChildElem(const XMLCh *const xml_str)
{
	return (0 == XMLString::compareString(
					 CDXLTokens::XmlstrToken(EdxltokenGPDBScalarOpLeftTypeId),
					 xml_str) ||
			0 == XMLString::compareString(
					 CDXLTokens::XmlstrToken(EdxltokenGPDBScalarOpRightTypeId),
					 xml_str) ||
			0 == XMLString::compareString(
					 CDXLTokens::XmlstrToken(EdxltokenGPDBScalarOpResultTypeId),
					 xml_str) ||
			0 == XMLString::compareString(
					 CDXLTokens::XmlstrToken(EdxltokenGPDBScalarOpFuncId),
					 xml_str) ||
			0 == XMLString::compareString(
					 CDXLTokens::XmlstrToken(EdxltokenGPDBScalarOpCommOpId),
					 xml_str) ||
			0 == XMLString::compareString(
					 CDXLTokens::XmlstrToken(EdxltokenGPDBScalarOpInverseOpId),
					 xml_str) ||
			0 == XMLString::compareString(
					 CDXLTokens::XmlstrToken(EdxltokenGPDBScalarOpHashOpfamily),
					 xml_str) ||
			0 == XMLString::compareString(
					 CDXLTokens::XmlstrToken(
						 EdxltokenGPDBScalarOpLegacyHashOpfamily),
					 xml_str));
}

// EOF

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