greenplumn CDXLScalarOpExpr 源码
greenplumn CDXLScalarOpExpr 代码
文件路径：/src/backend/gporca/libnaucrates/include/naucrates/dxl/operators/CDXLScalarOpExpr.h
//---------------------------------------------------------------------------
// Greenplum Database
// Copyright (C) 2010 Greenplum, Inc.
//
// @filename:
// CDXLScalarOpExpr.h
//
// @doc:
// Class for representing DXL scalar OpExpr such as A.a1 + (B.b1 * C.c1)
//---------------------------------------------------------------------------
#ifndef GPDXL_CDXLScalarOpExpr_H
#define GPDXL_CDXLScalarOpExpr_H
#include "gpos/base.h"
#include "naucrates/dxl/operators/CDXLScalar.h"
#include "naucrates/md/IMDId.h"
namespace gpdxl
{
using namespace gpos;
using namespace gpmd;
//---------------------------------------------------------------------------
// @class:
// CDXLScalarOpExpr
//
// @doc:
// Class for representing DXL scalar OpExpr
//
//---------------------------------------------------------------------------
class CDXLScalarOpExpr : public CDXLScalar
{
private:
// operator number in the catalog
IMDId *m_mdid;
// return type (or invalid if type can be infered from the metadata)
IMDId *m_return_type_mdid;
// operator name
const CWStringConst *m_str_opname;
public:
CDXLScalarOpExpr(const CDXLScalarOpExpr &) = delete;
// ctor/dtor
CDXLScalarOpExpr(CMemoryPool *mp, IMDId *mdid_op, IMDId *return_type_mdid,
const CWStringConst *str_opname);
~CDXLScalarOpExpr() override;
// ident accessors
Edxlopid GetDXLOperator() const override;
// name of the DXL operator
const CWStringConst *GetOpNameStr() const override;
// name of the operator
const CWStringConst *GetScalarOpNameStr() const;
// operator id
IMDId *MDId() const;
// operator return type
IMDId *GetReturnTypeMdId() const;
// serialize operator in DXL format
void SerializeToDXL(CXMLSerializer *, const CDXLNode *) const override;
// conversion function
static CDXLScalarOpExpr *
Cast(CDXLOperator *dxl_op)
{
GPOS_ASSERT(nullptr != dxl_op);
GPOS_ASSERT(EdxlopScalarOpExpr == dxl_op->GetDXLOperator());
return dynamic_cast<CDXLScalarOpExpr *>(dxl_op);
}
// 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
};
} // namespace gpdxl
#endif // !GPDXL_CDXLScalarOpExpr_H
// EOF
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