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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