greenplumn CDXLScalarHashExprList 代码
文件路径：/src/backend/gporca/libnaucrates/include/naucrates/dxl/operators/CDXLScalarHashExprList.h
/---------------------------------------------------------------------------
/ Greenplum Database
/ Copyright (C) 2010 Greenplum, Inc.
/
/ @filename:
/ CDXLScalarHashExprList.h
/
/ @doc:
/ Class for representing hash expressions list in DXL Redistribute motion nodes.
/---------------------------------------------------------------------------
#ifndef GPDXL_CDXLScalarHashExprList_H
#define GPDXL_CDXLScalarHashExprList_H
#include "gpos/base.h"
#include "naucrates/dxl/operators/CDXLScalar.h"
namespace gpdxl
{
/---------------------------------------------------------------------------
/ @class:
/ CDXLScalarHashExprList
/
/ @doc:
/ Hash expressions list in Redistribute motion nodes
/
/---------------------------------------------------------------------------
class CDXLScalarHashExprList : public CDXLScalar
{
private:
public:
CDXLScalarHashExprList(CDXLScalarHashExprList &) = delete;
/ ctor/dtor
explicit CDXLScalarHashExprList(CMemoryPool *mp);
~CDXLScalarHashExprList() override = default;
/ ident accessors
Edxlopid GetDXLOperator() const override;
/ name of the operator
const CWStringConst *GetOpNameStr() const override;
/ serialize operator in DXL format
void SerializeToDXL(CXMLSerializer *xml_serializer,
const CDXLNode *node) const override;
/ conversion function
static CDXLScalarHashExprList *
Cast(CDXLOperator *dxl_op)
{
GPOS_ASSERT(nullptr != dxl_op);
GPOS_ASSERT(EdxlopScalarHashExprList == dxl_op->GetDXLOperator());
return dynamic_cast<CDXLScalarHashExprList *>(dxl_op);
}
/ does the operator return a boolean result
BOOL
HasBoolResult(CMDAccessor * /md_accessor
) const override
{
GPOS_ASSERT(!"Invalid function call on a container operator");
return false;
}
#ifdef GPOS_DEBUG
/ checks whether the operator has valid structure
void AssertValid(const CDXLNode *node,
BOOL validate_children) const override;
#endif / GPOS_DEBUG
};
} / namespace gpdxl
#endif / !GPDXL_CDXLScalarHashExprList_H
/ EOF
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