greenplumn CLogicalProject 源码
greenplumn CLogicalProject 代码
文件路径:/src/backend/gporca/libgpopt/include/gpopt/operators/CLogicalProject.h
//---------------------------------------------------------------------------
// Greenplum Database
// Copyright (C) 2011 EMC Corp.
//
// @filename:
// CLogicalProject.h
//
// @doc:
// Project operator
//---------------------------------------------------------------------------
#ifndef GPOS_CLogicalProject_H
#define GPOS_CLogicalProject_H
#include "gpos/base.h"
#include "gpopt/operators/CExpressionHandle.h"
#include "gpopt/operators/CLogicalUnary.h"
namespace gpopt
{
// fwd declaration
class CColRefSet;
//---------------------------------------------------------------------------
// @class:
// CLogicalProject
//
// @doc:
// Project operator
//
//---------------------------------------------------------------------------
class CLogicalProject : public CLogicalUnary
{
private:
// return equivalence class from scalar ident project element
static CColRefSetArray *PdrgpcrsEquivClassFromScIdent(
CMemoryPool *mp, CExpression *pexprPrEl, CColRefSet *not_null_columns);
// extract constraint from scalar constant project element
static void ExtractConstraintFromScConst(CMemoryPool *mp,
CExpression *pexprPrEl,
CConstraintArray *pdrgpcnstr,
CColRefSetArray *pdrgpcrs);
public:
CLogicalProject(const CLogicalProject &) = delete;
// ctor
explicit CLogicalProject(CMemoryPool *mp);
// dtor
~CLogicalProject() override = default;
// ident accessors
EOperatorId
Eopid() const override
{
return EopLogicalProject;
}
const CHAR *
SzId() const override
{
return "CLogicalProject";
}
//-------------------------------------------------------------------------------------
// Derived Relational Properties
//-------------------------------------------------------------------------------------
// derive output columns
CColRefSet *DeriveOutputColumns(CMemoryPool *mp,
CExpressionHandle &exprhdl) override;
// dervive keys
CKeyCollection *DeriveKeyCollection(
CMemoryPool *mp, CExpressionHandle &exprhdl) const override;
// derive max card
CMaxCard DeriveMaxCard(CMemoryPool *mp,
CExpressionHandle &exprhdl) const override;
// derive constraint property
CPropConstraint *DerivePropertyConstraint(
CMemoryPool *mp, CExpressionHandle &exprhdl) const override;
//-------------------------------------------------------------------------------------
// Transformations
//-------------------------------------------------------------------------------------
// candidate set of xforms
CXformSet *PxfsCandidates(CMemoryPool *mp) const override;
// derive statistics
IStatistics *PstatsDerive(CMemoryPool *mp, CExpressionHandle &exprhdl,
IStatisticsArray *stats_ctxt) const override;
//-------------------------------------------------------------------------------------
//-------------------------------------------------------------------------------------
//-------------------------------------------------------------------------------------
// conversion function
static CLogicalProject *
PopConvert(COperator *pop)
{
GPOS_ASSERT(nullptr != pop);
GPOS_ASSERT(EopLogicalProject == pop->Eopid());
return dynamic_cast<CLogicalProject *>(pop);
}
}; // class CLogicalProject
} // namespace gpopt
#endif // !GPOS_CLogicalProject_H
// EOF
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