greenplumn CDXLScalarNullIf 源码

greenplumn CDXLScalarNullIf 代码

文件路径：/src/backend/gporca/libnaucrates/src/operators/CDXLScalarNullIf.cpp

//---------------------------------------------------------------------------
//	Greenplum Database
//	Copyright (C) 2012 EMC Corp.
//
//	@filename:
//		CDXLScalarNullIf.cpp
//
//	@doc:
//		Implementation of DXL NullIf operator
//---------------------------------------------------------------------------

#include "naucrates/dxl/operators/CDXLScalarNullIf.h"

#include "gpopt/mdcache/CMDAccessor.h"
#include "naucrates/dxl/CDXLUtils.h"
#include "naucrates/dxl/operators/CDXLNode.h"
#include "naucrates/dxl/xml/CXMLSerializer.h"

using namespace gpos;
using namespace gpdxl;

//---------------------------------------------------------------------------
//	@function:
//		CDXLScalarNullIf::CDXLScalarNullIf
//
//	@doc:
//		Ctor
//
//---------------------------------------------------------------------------
CDXLScalarNullIf::CDXLScalarNullIf(CMemoryPool *mp, IMDId *mdid_op,
								   IMDId *mdid_type)
	: CDXLScalar(mp), m_mdid_op(mdid_op), m_mdid_type(mdid_type)
{
	GPOS_ASSERT(mdid_op->IsValid());
	GPOS_ASSERT(mdid_type->IsValid());
}

//---------------------------------------------------------------------------
//	@function:
//		CDXLScalarNullIf::~CDXLScalarNullIf
//
//	@doc:
//		Dtor
//
//---------------------------------------------------------------------------
CDXLScalarNullIf::~CDXLScalarNullIf()
{
	m_mdid_op->Release();
	m_mdid_type->Release();
}

//---------------------------------------------------------------------------
//	@function:
//		CDXLScalarNullIf::GetDXLOperator
//
//	@doc:
//		Operator type
//
//---------------------------------------------------------------------------
Edxlopid
CDXLScalarNullIf::GetDXLOperator() const
{
	return EdxlopScalarNullIf;
}

//---------------------------------------------------------------------------
//	@function:
//		CDXLScalarNullIf::MdIdOp
//
//	@doc:
//		Operator id
//
//---------------------------------------------------------------------------
IMDId *
CDXLScalarNullIf::MdIdOp() const
{
	return m_mdid_op;
}

//---------------------------------------------------------------------------
//	@function:
//		CDXLScalarNullIf::MdidType
//
//	@doc:
//		Return type
//
//---------------------------------------------------------------------------
IMDId *
CDXLScalarNullIf::MdidType() const
{
	return m_mdid_type;
}

//---------------------------------------------------------------------------
//	@function:
//		CDXLScalarNullIf::GetOpNameStr
//
//	@doc:
//		Operator name
//
//---------------------------------------------------------------------------
const CWStringConst *
CDXLScalarNullIf::GetOpNameStr() const
{
	return CDXLTokens::GetDXLTokenStr(EdxltokenScalarNullIf);
	;
}

//---------------------------------------------------------------------------
//	@function:
//		CDXLScalarNullIf::HasBoolResult
//
//	@doc:
//		Does the operator return boolean result
//
//---------------------------------------------------------------------------
BOOL
CDXLScalarNullIf::HasBoolResult(CMDAccessor *md_accessor) const
{
	return (IMDType::EtiBool ==
			md_accessor->RetrieveType(m_mdid_type)->GetDatumType());
}

//---------------------------------------------------------------------------
//	@function:
//		CDXLScalarNullIf::SerializeToDXL
//
//	@doc:
//		Serialize operator in DXL format
//
//---------------------------------------------------------------------------
void
CDXLScalarNullIf::SerializeToDXL(CXMLSerializer *xml_serializer,
								 const CDXLNode *dxlnode) const
{
	const CWStringConst *element_name = GetOpNameStr();

	xml_serializer->OpenElement(
		CDXLTokens::GetDXLTokenStr(EdxltokenNamespacePrefix), element_name);

	m_mdid_op->Serialize(xml_serializer,
						 CDXLTokens::GetDXLTokenStr(EdxltokenOpNo));
	m_mdid_type->Serialize(xml_serializer,
						   CDXLTokens::GetDXLTokenStr(EdxltokenTypeId));

	dxlnode->SerializeChildrenToDXL(xml_serializer);
	xml_serializer->CloseElement(
		CDXLTokens::GetDXLTokenStr(EdxltokenNamespacePrefix), element_name);
}

#ifdef GPOS_DEBUG
//---------------------------------------------------------------------------
//	@function:
//		CDXLScalarNullIf::AssertValid
//
//	@doc:
//		Checks whether operator node is well-structured
//
//---------------------------------------------------------------------------
void
CDXLScalarNullIf::AssertValid(const CDXLNode *dxlnode,
							  BOOL validate_children) const
{
	const ULONG arity = dxlnode->Arity();
	GPOS_ASSERT(2 == arity);

	for (ULONG idx = 0; idx < arity; ++idx)
	{
		CDXLNode *child_dxlnode = (*dxlnode)[idx];
		GPOS_ASSERT(EdxloptypeScalar ==
					child_dxlnode->GetOperator()->GetDXLOperatorType());

		if (validate_children)
		{
			child_dxlnode->GetOperator()->AssertValid(child_dxlnode,
													  validate_children);
		}
	}
}
#endif	// GPOS_DEBUG

// EOF

相关信息

greenplumn 源码目录

相关文章

greenplumn CDXLColDescr 源码

greenplumn CDXLColRef 源码

greenplumn CDXLCtasStorageOptions 源码

greenplumn CDXLDatum 源码

greenplumn CDXLDatumBool 源码

greenplumn CDXLDatumGeneric 源码

greenplumn CDXLDatumInt2 源码

greenplumn CDXLDatumInt4 源码

greenplumn CDXLDatumInt8 源码

greenplumn CDXLDatumOid 源码