greenplumn CDXLScalarHashExpr 源码
greenplumn CDXLScalarHashExpr 代码
文件路径：/src/backend/gporca/libnaucrates/include/naucrates/dxl/operators/CDXLScalarHashExpr.h
//---------------------------------------------------------------------------
// Greenplum Database
// Copyright (C) 2010 Greenplum, Inc.
//
// @filename:
// CDXLScalarHashExpr.h
//
// @doc:
// Class for representing hash expressions list in DXL Redistribute motion nodes.
//---------------------------------------------------------------------------
#ifndef GPDXL_CDXLScalarHashExpr_H
#define GPDXL_CDXLScalarHashExpr_H
#include "gpos/base.h"
#include "naucrates/dxl/gpdb_types.h"
#include "naucrates/dxl/operators/CDXLScalar.h"
#include "naucrates/md/IMDId.h"
namespace gpdxl
{
using namespace gpmd;
//---------------------------------------------------------------------------
// @class:
// CDXLScalarHashExpr
//
// @doc:
// Hash expressions list in Redistribute motion nodes
//
//---------------------------------------------------------------------------
class CDXLScalarHashExpr : public CDXLScalar
{
private:
// catalog Oid of the distribution opfamily
IMDId *m_mdid_opfamily;
public:
CDXLScalarHashExpr(CDXLScalarHashExpr &) = delete;
// ctor/dtor
CDXLScalarHashExpr(CMemoryPool *mp, IMDId *mdid_type);
~CDXLScalarHashExpr() override;
// ident accessors
Edxlopid GetDXLOperator() const override;
// name of the operator
const CWStringConst *GetOpNameStr() const override;
IMDId *MdidOpfamily() const;
// serialize operator in DXL format
void SerializeToDXL(CXMLSerializer *xml_serializer,
const CDXLNode *node) const override;
// conversion function
static CDXLScalarHashExpr *
Cast(CDXLOperator *dxl_op)
{
GPOS_ASSERT(nullptr != dxl_op);
GPOS_ASSERT(EdxlopScalarHashExpr == dxl_op->GetDXLOperator());
return dynamic_cast<CDXLScalarHashExpr *>(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
void AssertValid(const CDXLNode *node,
BOOL validate_children) const override;
#endif // GPOS_DEBUG
};
} // namespace gpdxl
#endif // !GPDXL_CDXLScalarHashExpr_H
// EOF
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