greenplumn CDXLScalarCoerceBase 源码
greenplumn CDXLScalarCoerceBase 代码
文件路径：/src/backend/gporca/libnaucrates/include/naucrates/dxl/operators/CDXLScalarCoerceBase.h
//---------------------------------------------------------------------------
// Greenplum Database
// Copyright (C) 2017 VMware, Inc. or its affiliates.
//
// @filename:
// CDXLScalarCoerceBase.h
//
// @doc:
// Base class for representing DXL coerce operators
//
// @owner:
//
// @test:
//
//---------------------------------------------------------------------------
#ifndef GPDXL_CDXLScalarCoerceBase_H
#define GPDXL_CDXLScalarCoerceBase_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:
// CDXLScalarCoerceBase
//
// @doc:
// Base class for representing DXL coerce operators
//
//---------------------------------------------------------------------------
class CDXLScalarCoerceBase : public CDXLScalar
{
private:
// catalog MDId of the result type
IMDId *m_result_type_mdid;
// output type modifier
INT m_type_modifier;
// coercion form
EdxlCoercionForm m_dxl_coerce_format;
// location of token to be coerced
INT m_location;
public:
CDXLScalarCoerceBase(const CDXLScalarCoerceBase &) = delete;
// ctor/dtor
CDXLScalarCoerceBase(CMemoryPool *mp, IMDId *mdid_type, INT type_modifier,
EdxlCoercionForm dxl_coerce_format, INT location);
~CDXLScalarCoerceBase() override;
// return result type
IMDId *
GetResultTypeMdId() const
{
return m_result_type_mdid;
}
// return type modifier
INT
TypeModifier() const
{
return m_type_modifier;
}
// return coercion form
EdxlCoercionForm
GetDXLCoercionForm() const
{
return m_dxl_coerce_format;
}
// return token location
INT
GetLocation() const
{
return m_location;
}
// 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
// serialize operator in DXL format
void SerializeToDXL(CXMLSerializer *xml_serializer,
const CDXLNode *node) const override;
};
} // namespace gpdxl
#endif // !GPDXL_CDXLScalarCoerceBase_H
// EOF
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