greenplumn CDXLScalarPartListNullTest 源码
greenplumn CDXLScalarPartListNullTest 代码
文件路径：/src/backend/gporca/libnaucrates/include/naucrates/dxl/operators/CDXLScalarPartListNullTest.h
//---------------------------------------------------------------------------
// Greenplum Database
// Copyright (C) 2017 VMware, Inc. or its affiliates.
//
// Class for representing DXL Part list null test expressions
// These expressions indicate whether the list values of a part
// contain NULL value or not
//---------------------------------------------------------------------------
#ifndef GPDXL_CDXLScalarPartListNullTest_H
#define GPDXL_CDXLScalarPartListNullTest_H
#include "gpos/base.h"
#include "naucrates/dxl/operators/CDXLScalar.h"
namespace gpdxl
{
class CDXLScalarPartListNullTest : public CDXLScalar
{
private:
// partitioning level
ULONG m_partitioning_level;
// Null Test type (true for 'is null', false for 'is not null')
BOOL m_is_null;
public:
CDXLScalarPartListNullTest(const CDXLScalarPartListNullTest &) = delete;
// ctor
CDXLScalarPartListNullTest(CMemoryPool *mp, ULONG partitioning_level,
BOOL is_null);
// operator type
Edxlopid GetDXLOperator() const override;
// operator name
const CWStringConst *GetOpNameStr() const override;
// partitioning level
ULONG GetPartitioningLevel() const;
// Null Test type (true for 'is null', false for 'is not null')
BOOL IsNull() const;
// serialize operator in DXL format
void SerializeToDXL(CXMLSerializer *xml_serializer,
const CDXLNode *dxlnode) const override;
// 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
// conversion function
static CDXLScalarPartListNullTest *Cast(CDXLOperator *dxl_op);
};
} // namespace gpdxl
#endif // !GPDXL_CDXLScalarPartListNullTest_H
// EOF
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