greenplumn CDXLScalarPartBound 源码
greenplumn CDXLScalarPartBound 代码
文件路径：/src/backend/gporca/libnaucrates/include/naucrates/dxl/operators/CDXLScalarPartBound.h
//---------------------------------------------------------------------------
// Greenplum Database
// Copyright (C) 2014 VMware, Inc. or its affiliates.
//
// @filename:
// CDXLScalarPartBound.h
//
// @doc:
// Class for representing DXL Part boundary expressions
//---------------------------------------------------------------------------
#ifndef GPDXL_CDXLScalarPartBound_H
#define GPDXL_CDXLScalarPartBound_H
#include "gpos/base.h"
#include "naucrates/dxl/operators/CDXLScalar.h"
namespace gpdxl
{
//---------------------------------------------------------------------------
// @class:
// CDXLScalarPartBound
//
// @doc:
// Class for representing DXL Part boundary expressions
// These expressions are created and consumed by the PartitionSelector operator
//
//---------------------------------------------------------------------------
class CDXLScalarPartBound : public CDXLScalar
{
private:
// partitioning level
ULONG m_partitioning_level;
// boundary type
IMDId *m_mdid_type;
// whether this represents a lower or upper bound
BOOL m_is_lower_bound;
public:
CDXLScalarPartBound(const CDXLScalarPartBound &) = delete;
// ctor
CDXLScalarPartBound(CMemoryPool *mp, ULONG partitioning_level,
IMDId *mdid_type, BOOL is_lower_bound);
// dtor
~CDXLScalarPartBound() override;
// operator type
Edxlopid GetDXLOperator() const override;
// operator name
const CWStringConst *GetOpNameStr() const override;
// partitioning level
ULONG
GetPartitioningLevel() const
{
return m_partitioning_level;
}
// boundary type
IMDId *
MdidType() const
{
return m_mdid_type;
}
// is this a lower (or upper) bound
BOOL
IsLowerBound() const
{
return m_is_lower_bound;
}
// serialize operator in DXL format
void SerializeToDXL(CXMLSerializer *xml_serializer,
const CDXLNode *dxlnode) const override;
// does the operator return a boolean result
BOOL HasBoolResult(CMDAccessor *md_accessor) const override;
#ifdef GPOS_DEBUG
// checks whether the operator has valid structure, i.e. number and
// types of child nodes
void AssertValid(const CDXLNode *dxlnode,
BOOL validate_children) const override;
#endif // GPOS_DEBUG
// conversion function
static CDXLScalarPartBound *
Cast(CDXLOperator *dxl_op)
{
GPOS_ASSERT(nullptr != dxl_op);
GPOS_ASSERT(EdxlopScalarPartBound == dxl_op->GetDXLOperator());
return dynamic_cast<CDXLScalarPartBound *>(dxl_op);
}
};
} // namespace gpdxl
#endif // !GPDXL_CDXLScalarPartBound_H
// EOF
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