greenplumn CDXLScalarCoalesce 代码
文件路径：/src/backend/gporca/libnaucrates/src/operators/CDXLScalarCoalesce.cpp
/---------------------------------------------------------------------------
/ Greenplum Database
/ Copyright (C) 2012 EMC Corp.
/
/ @filename:
/ CDXLScalarCoalesce.cpp
/
/ @doc:
/ Implementation of DXL Coalesce
/---------------------------------------------------------------------------
#include "naucrates/dxl/operators/CDXLScalarCoalesce.h"
#include "gpopt/mdcache/CMDAccessor.h"
#include "naucrates/dxl/operators/CDXLNode.h"
#include "naucrates/dxl/xml/CXMLSerializer.h"
using namespace gpopt;
using namespace gpos;
using namespace gpdxl;
/---------------------------------------------------------------------------
/ @function:
/ CDXLScalarCoalesce::CDXLScalarCoalesce
/
/ @doc:
/ Ctor
/
/---------------------------------------------------------------------------
CDXLScalarCoalesce::CDXLScalarCoalesce(CMemoryPool *mp, IMDId *mdid_type)
: CDXLScalar(mp), m_mdid_type(mdid_type)
{
GPOS_ASSERT(m_mdid_type->IsValid());
}
/---------------------------------------------------------------------------
/ @function:
/ CDXLScalarCoalesce::~CDXLScalarCoalesce
/
/ @doc:
/ Dtor
/
/---------------------------------------------------------------------------
CDXLScalarCoalesce::~CDXLScalarCoalesce()
{
m_mdid_type->Release();
}
/---------------------------------------------------------------------------
/ @function:
/ CDXLScalarCoalesce::GetDXLOperator
/
/ @doc:
/ Operator type
/
/---------------------------------------------------------------------------
Edxlopid
CDXLScalarCoalesce::GetDXLOperator() const
{
return EdxlopScalarCoalesce;
}
/---------------------------------------------------------------------------
/ @function:
/ CDXLScalarCoalesce::GetOpNameStr
/
/ @doc:
/ Operator name
/
/---------------------------------------------------------------------------
const CWStringConst *
CDXLScalarCoalesce::GetOpNameStr() const
{
return CDXLTokens::GetDXLTokenStr(EdxltokenScalarCoalesce);
}
/---------------------------------------------------------------------------
/ @function:
/ CDXLScalarCoalesce::SerializeToDXL
/
/ @doc:
/ Serialize operator in DXL format
/
/---------------------------------------------------------------------------
void
CDXLScalarCoalesce::SerializeToDXL(CXMLSerializer *xml_serializer,
const CDXLNode *node) const
{
const CWStringConst *element_name = GetOpNameStr();
xml_serializer->OpenElement(
CDXLTokens::GetDXLTokenStr(EdxltokenNamespacePrefix), element_name);
m_mdid_type->Serialize(xml_serializer,
CDXLTokens::GetDXLTokenStr(EdxltokenTypeId));
node->SerializeChildrenToDXL(xml_serializer);
xml_serializer->CloseElement(
CDXLTokens::GetDXLTokenStr(EdxltokenNamespacePrefix), element_name);
}
/---------------------------------------------------------------------------
/ @function:
/ CDXLScalarCoalesce::HasBoolResult
/
/ @doc:
/ Does the operator return a boolean result
/
/---------------------------------------------------------------------------
BOOL
CDXLScalarCoalesce::HasBoolResult(CMDAccessor *md_accessor) const
{
return (IMDType::EtiBool ==
md_accessor->RetrieveType(m_mdid_type)->GetDatumType());
}
#ifdef GPOS_DEBUG
/---------------------------------------------------------------------------
/ @function:
/ CDXLScalarCoalesce::AssertValid
/
/ @doc:
/ Checks whether operator node is well-structured
/
/---------------------------------------------------------------------------
void
CDXLScalarCoalesce::AssertValid(const CDXLNode *node,
BOOL validate_children) const
{
GPOS_ASSERT(0 < node->Arity());
const ULONG arity = node->Arity();
for (ULONG ul = 0; ul < arity; ++ul)
{
CDXLNode *child_dxlnode = (*node)[ul];
GPOS_ASSERT(EdxloptypeScalar ==
child_dxlnode->GetOperator()->GetDXLOperatorType());
if (validate_children)
{
child_dxlnode->GetOperator()->AssertValid(child_dxlnode,
validate_children);
}
}
}
#endif / GPOS_DEBUG
/ EOF
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