greenplumn CDXLScalarComp 源码
greenplumn CDXLScalarComp 代码
文件路径：/src/backend/gporca/libnaucrates/include/naucrates/dxl/operators/CDXLScalarComp.h
//---------------------------------------------------------------------------
// Greenplum Database
// Copyright (C) 2010 Greenplum, Inc.
//
// @filename:
// CDXLScalarComp.h
//
// @doc:
// Class for representing DXL scalar comparison operators.
//---------------------------------------------------------------------------
#ifndef GPDXL_CDXLScalarComp_H
#define GPDXL_CDXLScalarComp_H
#include "gpos/base.h"
#include "naucrates/dxl/operators/CDXLScalar.h"
#include "naucrates/md/IMDId.h"
namespace gpdxl
{
using namespace gpos;
using namespace gpmd;
// indices of scalar comparison elements in the children array
enum Edxlsccmp
{
EdxlsccmpIndexLeft = 0,
EdxlsccmpIndexRight,
EdxlsccmpSentinel
};
//---------------------------------------------------------------------------
// @class:
// CDXLScalarComp
//
// @doc:
// Class for representing DXL scalar comparison operators
//
//---------------------------------------------------------------------------
class CDXLScalarComp : public CDXLScalar
{
protected:
// operator number in the catalog
IMDId *m_mdid;
// comparison operator name
const CWStringConst *m_comparison_operator_name;
private:
public:
CDXLScalarComp(CDXLScalarComp &) = delete;
// ctor/dtor
CDXLScalarComp(CMemoryPool *mp, IMDId *operator_mdid,
const CWStringConst *comparison_operator_name);
~CDXLScalarComp() override;
// accessor
// ident accessors
Edxlopid GetDXLOperator() const override;
// name of the DXL operator
const CWStringConst *GetOpNameStr() const override;
// name of the comparison operator
const CWStringConst *GetComparisonOpName() const;
// operator id
IMDId *MDId() const;
// serialize operator in DXL format
void SerializeToDXL(CXMLSerializer *xml_serializer,
const CDXLNode *node) const override;
// conversion function
static CDXLScalarComp *
Cast(CDXLOperator *dxl_op)
{
GPOS_ASSERT(nullptr != dxl_op);
GPOS_ASSERT(EdxlopScalarCmp == dxl_op->GetDXLOperator() ||
EdxlopScalarDistinct == dxl_op->GetDXLOperator() ||
EdxlopScalarArrayComp == dxl_op->GetDXLOperator());
return dynamic_cast<CDXLScalarComp *>(dxl_op);
}
// does the operator return a boolean result
BOOL
HasBoolResult(CMDAccessor * //md_accessor
) const override
{
return true;
}
#ifdef GPOS_DEBUG
// checks whether the operator has valid structure, i.e. number and
// types of child nodes
void AssertValid(const CDXLNode *node,
BOOL validate_children) const override;
#endif // GPOS_DEBUG
};
} // namespace gpdxl
#endif // !GPDXL_CDXLScalarComp_H
// EOF
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