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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