greenplumn CDXLScalarConstValue 代码
文件路径：/src/backend/gporca/libnaucrates/src/operators/CDXLScalarConstValue.cpp
/---------------------------------------------------------------------------
/ Greenplum Database
/ Copyright (C) 2010 Greenplum, Inc.
/
/ @filename:
/ CDXLScalarConstValue.cpp
/
/ @doc:
/ Implementation of DXL scalar const
/---------------------------------------------------------------------------
#include "naucrates/dxl/operators/CDXLScalarConstValue.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 gpopt;
using namespace gpos;
using namespace gpdxl;
/---------------------------------------------------------------------------
/ @function:
/ CDXLScalarConstValue::CDXLScalarConstValue
/
/ @doc:
/ Constructor
/
/---------------------------------------------------------------------------
CDXLScalarConstValue::CDXLScalarConstValue(CMemoryPool *mp,
CDXLDatum *dxl_datum)
: CDXLScalar(mp), m_dxl_datum(dxl_datum)
{
}
/---------------------------------------------------------------------------
/ @function:
/ CDXLScalarConstValue::~CDXLScalarConstValue
/
/ @doc:
/ Destructor
/
/---------------------------------------------------------------------------
CDXLScalarConstValue::~CDXLScalarConstValue()
{
m_dxl_datum->Release();
}
/---------------------------------------------------------------------------
/ @function:
/ CDXLScalarConstValue::GetDXLOperator
/
/ @doc:
/ Operator type
/
/---------------------------------------------------------------------------
Edxlopid
CDXLScalarConstValue::GetDXLOperator() const
{
return EdxlopScalarConstValue;
}
/---------------------------------------------------------------------------
/ @function:
/ CDXLScalarConstValue::GetOpNameStr
/
/ @doc:
/ Operator name
/
/---------------------------------------------------------------------------
const CWStringConst *
CDXLScalarConstValue::GetOpNameStr() const
{
return CDXLTokens::GetDXLTokenStr(EdxltokenScalarConstValue);
;
}
/---------------------------------------------------------------------------
/ @function:
/ CDXLScalarConstValue::SerializeToDXL
/
/ @doc:
/ Serialize operator in DXL format
/
/---------------------------------------------------------------------------
void
CDXLScalarConstValue::SerializeToDXL(CXMLSerializer *xml_serializer,
const CDXLNode * /node
) const
{
const CWStringConst *element_name = GetOpNameStr();
m_dxl_datum->Serialize(xml_serializer, element_name);
}
/---------------------------------------------------------------------------
/ @function:
/ CDXLScalarConstValue::HasBoolResult
/
/ @doc:
/ Does the operator return boolean result
/
/---------------------------------------------------------------------------
BOOL
CDXLScalarConstValue::HasBoolResult(CMDAccessor *md_accessor) const
{
return (IMDType::EtiBool ==
md_accessor->RetrieveType(m_dxl_datum->MDId())->GetDatumType());
}
#ifdef GPOS_DEBUG
/---------------------------------------------------------------------------
/ @function:
/ CDXLScalarConstValue::AssertValid
/
/ @doc:
/ Checks whether operator node is well-structured
/
/---------------------------------------------------------------------------
void
CDXLScalarConstValue::AssertValid(const CDXLNode *node,
BOOL / validate_children
) const
{
GPOS_ASSERT(0 == node->Arity());
GPOS_ASSERT(m_dxl_datum->MDId()->IsValid());
}
#endif / GPOS_DEBUG
/ EOF
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