greenplumn CDXLScalarSubqueryQuantified 源码
greenplumn CDXLScalarSubqueryQuantified 代码
文件路径：/src/backend/gporca/libnaucrates/include/naucrates/dxl/operators/CDXLScalarSubqueryQuantified.h
//---------------------------------------------------------------------------
// Greenplum Database
// Copyright (C) 2012 EMC, Corp.
//
// @filename:
// CDXLScalarSubqueryQuantified.h
//
// @doc:
// Base class for ANY/ALL subqueries
//---------------------------------------------------------------------------
#ifndef GPDXL_CDXLScalarSubqueryQuantified_H
#define GPDXL_CDXLScalarSubqueryQuantified_H
#include "gpos/base.h"
#include "naucrates/dxl/operators/CDXLNode.h"
#include "naucrates/dxl/operators/CDXLScalar.h"
#include "naucrates/md/CMDName.h"
#include "naucrates/md/IMDId.h"
namespace gpdxl
{
using namespace gpmd;
//---------------------------------------------------------------------------
// @class:
// CDXLScalarSubqueryQuantified
//
// @doc:
// Base class for ANY/ALL subqueries
//
//---------------------------------------------------------------------------
class CDXLScalarSubqueryQuantified : public CDXLScalar
{
public:
// indices of the subquery elements in the children array
enum Edxlsqquantified
{
EdxlsqquantifiedIndexScalar,
EdxlsqquantifiedIndexRelational,
EdxlsqquantifiedIndexSentinel
};
private:
// id of the scalar comparison operator
IMDId *m_scalar_op_mdid;
// name of scalar comparison operator
CMDName *m_scalar_op_mdname;
// colid produced by the relational child of the AnySubquery operator
ULONG m_colid;
public:
CDXLScalarSubqueryQuantified(CDXLScalarSubqueryQuantified &) = delete;
// ctor
CDXLScalarSubqueryQuantified(CMemoryPool *mp, IMDId *scalar_op_mdid,
CMDName *mdname, ULONG colid);
// dtor
~CDXLScalarSubqueryQuantified() override;
// scalar operator id
IMDId *
GetScalarOpMdId() const
{
return m_scalar_op_mdid;
}
// scalar operator name
const CMDName *
GetScalarOpMdName() const
{
return m_scalar_op_mdname;
}
// subquery colid
ULONG
GetColId() const
{
return m_colid;
}
// serialize operator in DXL format
void SerializeToDXL(CXMLSerializer *, const CDXLNode *) const override;
// conversion function
static CDXLScalarSubqueryQuantified *
Cast(CDXLOperator *dxl_op)
{
GPOS_ASSERT(nullptr != dxl_op);
GPOS_ASSERT(EdxlopScalarSubqueryAll == dxl_op->GetDXLOperator() ||
EdxlopScalarSubqueryAny == dxl_op->GetDXLOperator());
return dynamic_cast<CDXLScalarSubqueryQuantified *>(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_CDXLScalarSubqueryQuantified_H
// EOF
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