greenplumn CDXLScalarCast 源码
greenplumn CDXLScalarCast 代码
文件路径：/src/backend/gporca/libnaucrates/include/naucrates/dxl/operators/CDXLScalarCast.h
//---------------------------------------------------------------------------
// Greenplum Database
// Copyright (C) 2011 Greenplum, Inc.
//
// @filename:
// CDXLScalarCast.h
//
// @doc:
// Class for representing DXL casting operation
//
// @owner:
//
//
// @test:
//
//---------------------------------------------------------------------------
#ifndef GPDXL_CDXLScalarCast_H
#define GPDXL_CDXLScalarCast_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:
// CDXLScalarCast
//
// @doc:
// Class for representing DXL casting operator
//
//---------------------------------------------------------------------------
class CDXLScalarCast : public CDXLScalar
{
private:
// catalog MDId of the column's type
IMDId *m_mdid_type;
// catalog MDId of the function implementing the casting
IMDId *m_func_mdid;
public:
CDXLScalarCast(const CDXLScalarCast &) = delete;
// ctor/dtor
CDXLScalarCast(CMemoryPool *mp, IMDId *mdid_type, IMDId *func_mdid);
~CDXLScalarCast() override;
// ident accessors
Edxlopid GetDXLOperator() const override;
IMDId *MdidType() const;
IMDId *FuncMdId() const;
// name of the DXL operator name
const CWStringConst *GetOpNameStr() const override;
// conversion function
static CDXLScalarCast *
Cast(CDXLOperator *dxl_op)
{
GPOS_ASSERT(nullptr != dxl_op);
GPOS_ASSERT(EdxlopScalarCast == dxl_op->GetDXLOperator());
return dynamic_cast<CDXLScalarCast *>(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
// serialize operator in DXL format
void SerializeToDXL(CXMLSerializer *xml_serializer,
const CDXLNode *dxlnode) const override;
};
} // namespace gpdxl
#endif // !GPDXL_CDXLScalarCast_H
// EOF
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