greenplumn CDXLScalarBoolExpr 源码
greenplumn CDXLScalarBoolExpr 代码
文件路径：/src/backend/gporca/libnaucrates/include/naucrates/dxl/operators/CDXLScalarBoolExpr.h
//---------------------------------------------------------------------------
// Greenplum Database
// Copyright (C) 2010 Greenplum, Inc.
//
// @filename:
// CDXLScalarBoolExpr.h
//
// @doc:
// Class for representing DXL BoolExpr
//---------------------------------------------------------------------------
#ifndef GPDXL_CDXLScalarBoolExpr_H
#define GPDXL_CDXLScalarBoolExpr_H
#include "gpos/base.h"
#include "naucrates/dxl/operators/CDXLScalar.h"
namespace gpdxl
{
using namespace gpos;
enum EdxlBoolExprType
{
Edxland,
Edxlor,
Edxlnot,
EdxlBoolExprTypeSentinel
};
//---------------------------------------------------------------------------
// @class:
// CDXLScalarBoolExpr
//
// @doc:
// Class for representing DXL BoolExpr
//
//---------------------------------------------------------------------------
class CDXLScalarBoolExpr : public CDXLScalar
{
private:
// operator type
const EdxlBoolExprType m_bool_type;
public:
CDXLScalarBoolExpr(const CDXLScalarBoolExpr &) = delete;
// ctor/dtor
explicit CDXLScalarBoolExpr(CMemoryPool *mp,
const EdxlBoolExprType bool_type);
// ident accessors
Edxlopid GetDXLOperator() const override;
// BoolExpr operator type
EdxlBoolExprType GetDxlBoolTypeStr() const;
// name of the DXL operator name
const CWStringConst *GetOpNameStr() const override;
// serialize operator in DXL format
void SerializeToDXL(CXMLSerializer *, const CDXLNode *) const override;
// conversion function
static CDXLScalarBoolExpr *
Cast(CDXLOperator *dxl_op)
{
GPOS_ASSERT(nullptr != dxl_op);
GPOS_ASSERT(EdxlopScalarBoolExpr == dxl_op->GetDXLOperator());
return dynamic_cast<CDXLScalarBoolExpr *>(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_CDXLScalarBoolExpr_H
// EOF
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