greenplumn CDXLScalarNullTest 源码
greenplumn CDXLScalarNullTest 代码
文件路径：/src/backend/gporca/libnaucrates/include/naucrates/dxl/operators/CDXLScalarNullTest.h
//---------------------------------------------------------------------------
// Greenplum Database
// Copyright (C) 2011 Greenplum, Inc.
//
// @filename:
// CDXLScalarNullTest.h
//
// @doc:
// Class for representing DXL NullTest that tests if the given expression
// is null or is not null.
// @owner:
//
//
// @test:
//
//---------------------------------------------------------------------------
#ifndef GPDXL_CDXLScalarNullTest_H
#define GPDXL_CDXLScalarNullTest_H
#include "gpos/base.h"
#include "naucrates/dxl/operators/CDXLScalar.h"
namespace gpdxl
{
using namespace gpos;
//---------------------------------------------------------------------------
// @class:
// CDXLScalarNullTest
//
// @doc:
// Class for representing DXL NullTest
//
//---------------------------------------------------------------------------
class CDXLScalarNullTest : public CDXLScalar
{
private:
// is nul or is not null operation
BOOL m_is_null;
// private copy ctor
CDXLScalarNullTest(const CDXLScalarNullTest &);
public:
// ctor/
CDXLScalarNullTest(CMemoryPool *mp, BOOL is_null);
// ident accessors
Edxlopid GetDXLOperator() const override;
// name of the DXL operator name
const CWStringConst *GetOpNameStr() const override;
// NullTest operator type
BOOL IsNullTest() const;
// name of the operator
const CWStringConst *PstrTestName() const;
// serialize operator in DXL format
void SerializeToDXL(CXMLSerializer *, const CDXLNode *) const override;
// conversion function
static CDXLScalarNullTest *
Cast(CDXLOperator *dxl_op)
{
GPOS_ASSERT(nullptr != dxl_op);
GPOS_ASSERT(EdxlopScalarNullTest == dxl_op->GetDXLOperator());
return dynamic_cast<CDXLScalarNullTest *>(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, 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_CDXLScalarNullTest_H
// EOF
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