greenplumn CDrvdPropScalar 代码
文件路径：/src/backend/gporca/libgpopt/include/gpopt/base/CDrvdPropScalar.h
/---------------------------------------------------------------------------
/ Greenplum Database
/ Copyright (C) 2009 Greenplum, Inc.
/
/ @filename:
/ CDrvdPropScalar.h
/
/ @doc:
/ Derived scalar properties
/---------------------------------------------------------------------------
#ifndef GPOPT_CDrvdPropScalar_H
#define GPOPT_CDrvdPropScalar_H
#include "gpos/base.h"
#include "gpos/common/CRefCount.h"
#include "gpopt/base/CColRef.h"
#include "gpopt/base/CColRefSet.h"
#include "gpopt/base/CDrvdProp.h"
#include "gpopt/base/CFunctionProp.h"
#include "gpopt/base/CPartInfo.h"
namespace gpopt
{
using namespace gpos;
/ forward declaration
class CExpressionHandle;
/---------------------------------------------------------------------------
/ @class:
/ CDrvdPropScalar
/
/ @doc:
/ Derived scalar properties container.
/
/ These are properties specific to scalar expressions like predicates and
/ project list. This includes used and defined columns.
/
/---------------------------------------------------------------------------
class CDrvdPropScalar : public CDrvdProp
{
friend class CExpression;
enum EDrvdPropType
{
EdptPcrsDefined = 0,
EdptPcrsUsed,
EdptPcrsSetReturningFunction,
EdptFHasSubquery,
EdptPPartInfo,
EdptPfp,
EdptFHasNonScalarFunction,
EdptUlDistinctAggs,
EdptUlOrderedAggs,
EdptFHasMultipleDistinctAggs,
EdptFHasScalarArrayCmp,
EdptFHasScalarFuncProject,
EdptSentinel
};
private:
CMemoryPool *m_mp;
CBitSet *m_is_prop_derived;
/ defined columns
CColRefSet *m_pcrsDefined;
/ columns generated by set-returning-function like 'unnest'
CColRefSet *m_pcrsSetReturningFunction;
/ used columns
CColRefSet *m_pcrsUsed;
/ do subqueries appear in the operator's tree?
BOOL m_fHasSubquery;
/ partition table consumers in subqueries
CPartInfo *m_ppartinfo;
/ function properties
CFunctionProp *m_pfp;
/ scalar expression contains non-scalar function?
BOOL m_fHasNonScalarFunction;
/ total number of Distinct Aggs (e.g., {count(distinct a), sum(distinct a), count(distinct b)}, the value is 3),
/ only applicable to project lists
ULONG m_ulDistinctAggs;
/ only applicable to project lists
BOOL m_fHasScalarFunc;
/ does operator define Distinct Aggs on different arguments (e.g., count(distinct a), sum(distinct b)),
/ only applicable to project lists
BOOL m_fHasMultipleDistinctAggs;
ULONG m_ulOrderedAggs;
/ does expression contain ScalarArrayCmp generated for "scalar op ANY/ALL (array)" construct
BOOL m_fHasScalarArrayCmp;
/ Have all the properties been derived?
/
/ NOTE1: This is set ONLY when Derive() is called. If all the properties
/ are independently derived, m_is_complete will remain false. In that
/ case, even though Derive() would attempt to derive all the properties
/ once again, it should be quick, since each individual member has been
/ cached.
/ NOTE2: Once these properties are detached from the
/ corresponding expression used to derive it, this MUST be set to true,
/ since after the detachment, there will be no way to derive the
/ properties once again.
BOOL m_is_complete;
protected:
CColRefSet *DeriveDefinedColumns(CExpressionHandle &);
CColRefSet *DeriveUsedColumns(CExpressionHandle &);
CColRefSet *DeriveSetReturningFunctionColumns(CExpressionHandle &);
BOOL DeriveHasSubquery(CExpressionHandle &);
CPartInfo *DerivePartitionInfo(CExpressionHandle &);
CFunctionProp *DeriveFunctionProperties(CExpressionHandle &);
BOOL DeriveHasNonScalarFunction(CExpressionHandle &);
ULONG DeriveTotalDistinctAggs(CExpressionHandle &);
BOOL DeriveHasScalarFuncProject(CExpressionHandle &);
BOOL DeriveHasMultipleDistinctAggs(CExpressionHandle &);
BOOL DeriveHasScalarArrayCmp(CExpressionHandle &);
ULONG DeriveTotalOrderedAggs(CExpressionHandle &);
public:
CDrvdPropScalar(const CDrvdPropScalar &) = delete;
/ ctor
CDrvdPropScalar(CMemoryPool *mp);
/ dtor
~CDrvdPropScalar() override;
/ type of properties
EPropType
Ept() override
{
return EptScalar;
}
BOOL
IsComplete() const override
{
return m_is_complete;
}
/ derivation function
void Derive(CMemoryPool *mp, CExpressionHandle &exprhdl,
CDrvdPropCtxt *pdpctxt) override;
/ check for satisfying required plan properties
BOOL FSatisfies(const CReqdPropPlan *prpp) const override;
/ defined columns
CColRefSet *GetDefinedColumns() const;
/ used columns
CColRefSet *GetUsedColumns() const;
/ columns containing set-returning function
CColRefSet *GetSetReturningFunctionColumns() const;
/ do subqueries appear in the operator's tree?
BOOL HasSubquery() const;
/ derived partition consumers
CPartInfo *GetPartitionInfo() const;
/ function properties
CFunctionProp *GetFunctionProperties() const;
/ scalar expression contains non-scalar function?
virtual BOOL HasNonScalarFunction() const;
/ return total number of Distinct Aggs, only applicable to project list
ULONG GetTotalDistinctAggs() const;
BOOL HasScalarFuncProject() const;
/ does operator define Distinct Aggs on different arguments, only applicable to project lists
BOOL HasMultipleDistinctAggs() const;
BOOL HasScalarArrayCmp() const;
/ short hand for conversion
static CDrvdPropScalar *GetDrvdScalarProps(CDrvdProp *pdp);
/ print function
IOstream &OsPrint(IOstream &os) const override;
}; / class CDrvdPropScalar
} / namespace gpopt
#endif / !GPOPT_CDrvdPropScalar_H
/ EOF
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