greenplumn CDXLScalarIfStmt 源码
greenplumn CDXLScalarIfStmt 代码
文件路径：/src/backend/gporca/libnaucrates/include/naucrates/dxl/operators/CDXLScalarIfStmt.h
//---------------------------------------------------------------------------
// Greenplum Database
// Copyright (C) 2010 Greenplum, Inc.
//
// @filename:
// CDXLScalarIfStmt.h
//
// @doc:
//
// Class for representing DXL If Statement (Case Statement is represented as a nested if statement)
//---------------------------------------------------------------------------
#ifndef GPDXL_CDXLScalarIfStmt_H
#define GPDXL_CDXLScalarIfStmt_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:
// CDXLScalarIfStmt
//
// @doc:
// Class for representing DXL IF statement
//
//---------------------------------------------------------------------------
class CDXLScalarIfStmt : public CDXLScalar
{
private:
// catalog MDId of the return type
IMDId *m_result_type_mdid;
public:
CDXLScalarIfStmt(const CDXLScalarIfStmt &) = delete;
// ctor
CDXLScalarIfStmt(CMemoryPool *mp, IMDId *mdid_type);
//dtor
~CDXLScalarIfStmt() override;
// name of the operator
const CWStringConst *GetOpNameStr() const override;
IMDId *GetResultTypeMdId() const;
// DXL Operator ID
Edxlopid GetDXLOperator() const override;
// serialize operator in DXL format
void SerializeToDXL(CXMLSerializer *xml_serializer,
const CDXLNode *node) const override;
// conversion function
static CDXLScalarIfStmt *
Cast(CDXLOperator *dxl_op)
{
GPOS_ASSERT(nullptr != dxl_op);
GPOS_ASSERT(EdxlopScalarIfStmt == dxl_op->GetDXLOperator());
return dynamic_cast<CDXLScalarIfStmt *>(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 *node,
BOOL validate_children) const override;
#endif // GPOS_DEBUG
};
} // namespace gpdxl
#endif // !GPDXL_CDXLScalarIfStmt_H
// EOF
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