greenplumn CDXLScalarOneTimeFilter 源码
greenplumn CDXLScalarOneTimeFilter 代码
文件路径：/src/backend/gporca/libnaucrates/include/naucrates/dxl/operators/CDXLScalarOneTimeFilter.h
//---------------------------------------------------------------------------
// Greenplum Database
// Copyright (C) 2010 Greenplum, Inc.
//
// @filename:
// CDXLScalarOneTimeFilter.h
//
// @doc:
// Class for representing a scalar filter that is executed once inside DXL physical operators.
//---------------------------------------------------------------------------
#ifndef GPDXL_CDXLScalarOneTimeFilter_H
#define GPDXL_CDXLScalarOneTimeFilter_H
#include "gpos/base.h"
#include "naucrates/dxl/operators/CDXLScalarFilter.h"
namespace gpdxl
{
//---------------------------------------------------------------------------
// @class:
// CDXLScalarOneTimeFilter
//
// @doc:
// Class for representing DXL filter operators
//
//---------------------------------------------------------------------------
class CDXLScalarOneTimeFilter : public CDXLScalarFilter
{
private:
public:
CDXLScalarOneTimeFilter(CDXLScalarOneTimeFilter &) = delete;
// ctor
explicit CDXLScalarOneTimeFilter(CMemoryPool *mp);
// accessors
Edxlopid GetDXLOperator() const override;
const CWStringConst *GetOpNameStr() const override;
// conversion function
static CDXLScalarOneTimeFilter *
Cast(CDXLOperator *dxl_op)
{
GPOS_ASSERT(nullptr != dxl_op);
GPOS_ASSERT(EdxlopScalarOneTimeFilter == dxl_op->GetDXLOperator());
return dynamic_cast<CDXLScalarOneTimeFilter *>(dxl_op);
}
// serialize operator in DXL format
void SerializeToDXL(CXMLSerializer *, const CDXLNode *) const override;
// does the operator return a boolean result
BOOL
HasBoolResult(CMDAccessor * //md_accessor
) const override
{
GPOS_ASSERT(!"Invalid function call for a container operator");
return false;
}
};
} // namespace gpdxl
#endif // !GPDXL_CDXLScalarOneTimeFilter_H
// EOF
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