greenplumn CLogicalUnionAll 源码
greenplumn CLogicalUnionAll 代码
文件路径：/src/backend/gporca/libgpopt/include/gpopt/operators/CLogicalUnionAll.h
//---------------------------------------------------------------------------
// Greenplum Database
// Copyright (C) 2012 EMC Corp.
//
// @filename:
// CLogicalUnionAll.h
//
// @doc:
// Logical Union all operator
//---------------------------------------------------------------------------
#ifndef GPOPT_CLogicalUnionAll_H
#define GPOPT_CLogicalUnionAll_H
#include "gpos/base.h"
#include "gpopt/operators/CExpressionHandle.h"
#include "gpopt/operators/CLogicalUnion.h"
namespace gpopt
{
//---------------------------------------------------------------------------
// @class:
// CLogicalUnionAll
//
// @doc:
// Union all operators
//
//---------------------------------------------------------------------------
class CLogicalUnionAll : public CLogicalUnion
{
public:
CLogicalUnionAll(const CLogicalUnionAll &) = delete;
// ctor
explicit CLogicalUnionAll(CMemoryPool *mp);
CLogicalUnionAll(CMemoryPool *mp, CColRefArray *pdrgpcrOutput,
CColRef2dArray *pdrgpdrgpcrInput);
// dtor
~CLogicalUnionAll() override;
// ident accessors
EOperatorId
Eopid() const override
{
return EopLogicalUnionAll;
}
// return a string for operator name
const CHAR *
SzId() const override
{
return "CLogicalUnionAll";
}
// sensitivity to order of inputs
BOOL
FInputOrderSensitive() const override
{
return true;
}
// return a copy of the operator with remapped columns
COperator *PopCopyWithRemappedColumns(CMemoryPool *mp,
UlongToColRefMap *colref_mapping,
BOOL must_exist) override;
//-------------------------------------------------------------------------------------
// Derived Relational Properties
//-------------------------------------------------------------------------------------
// derive max card
CMaxCard DeriveMaxCard(CMemoryPool *mp,
CExpressionHandle &exprhdl) const override;
// derive key collections
CKeyCollection *DeriveKeyCollection(
CMemoryPool *mp, CExpressionHandle &exprhdl) const override;
//-------------------------------------------------------------------------------------
// Transformations
//-------------------------------------------------------------------------------------
// candidate set of xforms
CXformSet *PxfsCandidates(CMemoryPool *mp) const override;
// stat promise
EStatPromise
Esp(CExpressionHandle &) const override
{
return CLogical::EspHigh;
}
// derive statistics
IStatistics *PstatsDerive(CMemoryPool *mp, CExpressionHandle &exprhdl,
IStatisticsArray *stats_ctxt) const override;
// conversion function
static CLogicalUnionAll *
PopConvert(COperator *pop)
{
GPOS_ASSERT(nullptr != pop);
GPOS_ASSERT(EopLogicalUnionAll == pop->Eopid());
return dynamic_cast<CLogicalUnionAll *>(pop);
}
// derive statistics based on union all semantics
static IStatistics *PstatsDeriveUnionAll(CMemoryPool *mp,
CExpressionHandle &exprhdl);
}; // class CLogicalUnionAll
} // namespace gpopt
#endif // !GPOPT_CLogicalUnionAll_H
// EOF
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