greenplumn CDXLScalarFuncExpr 代码
文件路径：/src/backend/gporca/libnaucrates/include/naucrates/dxl/operators/CDXLScalarFuncExpr.h
/---------------------------------------------------------------------------
/ Greenplum Database
/ Copyright (C) 2011 Greenplum, Inc.
/
/ @filename:
/ CDXLScalarFuncExpr.h
/
/ @doc:
/ Class for representing DXL scalar FuncExpr
/---------------------------------------------------------------------------
#ifndef GPDXL_CDXLScalarFuncExpr_H
#define GPDXL_CDXLScalarFuncExpr_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:
/ CDXLScalarFuncExpr
/
/ @doc:
/ Class for representing DXL scalar FuncExpr
/
/---------------------------------------------------------------------------
class CDXLScalarFuncExpr : public CDXLScalar
{
private:
/ catalog id of the function
IMDId *m_func_mdid;
/ return type
IMDId *m_return_type_mdid;
const INT m_return_type_modifier;
/ does the func return a set
BOOL m_returns_set;
public:
CDXLScalarFuncExpr(const CDXLScalarFuncExpr &) = delete;
/ ctor
CDXLScalarFuncExpr(CMemoryPool *mp, IMDId *mdid_func,
IMDId *mdid_return_type, INT return_type_modifier,
BOOL returns_set);
/dtor
~CDXLScalarFuncExpr() override;
/ ident accessors
Edxlopid GetDXLOperator() const override;
/ name of the DXL operator
const CWStringConst *GetOpNameStr() const override;
/ function id
IMDId *FuncMdId() const;
/ return type
IMDId *ReturnTypeMdId() const;
INT TypeModifier() const;
/ does function return a set
BOOL ReturnsSet() const;
/ serialize operator in DXL format
void SerializeToDXL(CXMLSerializer *xml_serializer,
const CDXLNode *dxlnode) const override;
/ conversion function
static CDXLScalarFuncExpr *
Cast(CDXLOperator *dxl_op)
{
GPOS_ASSERT(nullptr != dxl_op);
GPOS_ASSERT(EdxlopScalarFuncExpr == dxl_op->GetDXLOperator());
return dynamic_cast<CDXLScalarFuncExpr *>(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_CDXLScalarFuncExpr_H
/ EOF
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