greenplumn CDXLScalarSubquery 代码
文件路径：/src/backend/gporca/libnaucrates/include/naucrates/dxl/operators/CDXLScalarSubquery.h
/---------------------------------------------------------------------------
/ Greenplum Database
/ Copyright (C) 2011 EMC, Corp.
/
/ @filename:
/ CDXLScalarSubquery.h
/
/ @doc:
/ Class for representing subqueries computing scalar values
/---------------------------------------------------------------------------
#ifndef GPDXL_CDXLScalarSubquery_H
#define GPDXL_CDXLScalarSubquery_H
#include "gpos/base.h"
#include "naucrates/dxl/operators/CDXLNode.h"
#include "naucrates/dxl/operators/CDXLScalar.h"
namespace gpdxl
{
/---------------------------------------------------------------------------
/ @class:
/ CDXLScalarSubquery
/
/ @doc:
/ Class for representing subqueries computing scalar values
/
/---------------------------------------------------------------------------
class CDXLScalarSubquery : public CDXLScalar
{
private:
/ id of column computed by the subquery
ULONG m_colid;
public:
CDXLScalarSubquery(CDXLScalarSubquery &) = delete;
/ ctor/dtor
CDXLScalarSubquery(CMemoryPool *mp, ULONG colid);
~CDXLScalarSubquery() override;
/ ident accessors
Edxlopid GetDXLOperator() const override;
/ colid of subquery column
ULONG
GetColId() const
{
return m_colid;
}
/ name of the operator
const CWStringConst *GetOpNameStr() const override;
/ serialize operator in DXL format
void SerializeToDXL(CXMLSerializer *, const CDXLNode *) const override;
/ conversion function
static CDXLScalarSubquery *
Cast(CDXLOperator *dxl_op)
{
GPOS_ASSERT(nullptr != dxl_op);
GPOS_ASSERT(EdxlopScalarSubquery == dxl_op->GetDXLOperator());
return dynamic_cast<CDXLScalarSubquery *>(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_CDXLScalarSubquery_H
/ EOF
相关信息
相关文章
greenplumn CDXLCtasStorageOptions 源码