greenplumn CPhysicalUnionAll 代码
文件路径：/src/backend/gporca/libgpopt/include/gpopt/operators/CPhysicalUnionAll.h
/ Greenplum Database
/ Copyright (C) 2016 VMware, Inc. or its affiliates.
#ifndef GPOPT_CPhysicalUnionAll_H
#define GPOPT_CPhysicalUnionAll_H
#include "gpopt/base/CColRefSet.h"
#include "gpopt/base/CDistributionSpecHashed.h"
#include "gpopt/operators/COperator.h"
#include "gpopt/operators/CPhysical.h"
namespace gpopt
{
class CPhysicalUnionAll : public CPhysical
{
private:
/ output column array
CColRefArray *const m_pdrgpcrOutput;
/ input column array
CColRef2dArray *const m_pdrgpdrgpcrInput;
/ set representation of input columns
CColRefSetArray *m_pdrgpcrsInput;
/ array of child hashed distributions -- used locally for distribution derivation
CDistributionSpecArray *m_pdrgpds;
void PopulateDistrSpecs(CMemoryPool *mp, CColRefArray *pdrgpcrOutput,
CColRef2dArray *pdrgpdrgpcrInput);
/ map given array of scalar ident expressions to positions of UnionAll input columns in the given child;
ULongPtrArray *PdrgpulMap(CMemoryPool *mp, CExpressionArray *pdrgpexpr,
ULONG child_index) const;
/ map given ColRefSet, expressed in terms of outputs,
/ into an equivalent ColRefSet, expressed in terms
/ of input number n
CColRefSet *MapOutputColRefsToInput(CMemoryPool *mp,
CColRefSet *out_col_refs,
ULONG child_index);
/ derive hashed distribution from child operators
CDistributionSpecHashed *PdshashedDerive(CMemoryPool *mp,
CExpressionHandle &exprhdl) const;
/ derive strict random distribution spec if all the children of the parallel union all
/ node derive strict random; derive null spec otherwise
static CDistributionSpecRandom *PdsStrictRandomParallelUnionAllChildren(
CMemoryPool *mp, CExpressionHandle &expr_handle);
/ compute output hashed distribution matching the outer child's hashed distribution
CDistributionSpecHashed *PdsMatching(
CMemoryPool *mp, const ULongPtrArray *pdrgpulOuter) const;
/ derive output distribution based on child distribution
static CDistributionSpec *PdsDeriveFromChildren(CMemoryPool *mp,
CExpressionHandle &exprhdl);
protected:
/ compute required hashed distribution of the n-th child
CDistributionSpecHashed *PdshashedPassThru(
CMemoryPool *mp, CDistributionSpecHashed *pdshashedRequired,
ULONG child_index) const;
public:
CPhysicalUnionAll(CMemoryPool *mp, CColRefArray *pdrgpcrOutput,
CColRef2dArray *pdrgpdrgpcrInput);
~CPhysicalUnionAll() override;
/ match function
BOOL Matches(COperator *) const override;
/ ident accessors
EOperatorId Eopid() const override = 0;
const CHAR *SzId() const override = 0;
/ sensitivity to order of inputs
BOOL FInputOrderSensitive() const override;
/ accessor of output column array
CColRefArray *PdrgpcrOutput() const;
/ accessor of input column array
CColRef2dArray *PdrgpdrgpcrInput() const;
/ return true if operator passes through stats obtained from children,
/ this is used when computing stats during costing
BOOL FPassThruStats() const override;
/-------------------------------------------------------------------------------------
/ Required Plan Properties
/-------------------------------------------------------------------------------------
/ compute required output columns of the n-th child
CColRefSet *PcrsRequired(CMemoryPool *mp, CExpressionHandle &exprhdl,
CColRefSet *pcrsRequired, ULONG child_index,
CDrvdPropArray *pdrgpdpCtxt,
ULONG ulOptReq) override;
/ compute required ctes of the n-th child
CCTEReq *PcteRequired(CMemoryPool *mp, CExpressionHandle &exprhdl,
CCTEReq *pcter, ULONG child_index,
CDrvdPropArray *pdrgpdpCtxt,
ULONG ulOptReq) const override;
/ compute required sort order of the n-th child
COrderSpec *PosRequired(CMemoryPool *mp, CExpressionHandle &exprhdl,
COrderSpec *posRequired, ULONG child_index,
CDrvdPropArray *pdrgpdpCtxt,
ULONG ulOptReq) const override;
/ compute required rewindability of the n-th child
CRewindabilitySpec *PrsRequired(CMemoryPool *mp, CExpressionHandle &exprhdl,
CRewindabilitySpec *prsRequired,
ULONG child_index,
CDrvdPropArray *pdrgpdpCtxt,
ULONG ulOptReq) const override;
/ conversion function
static CPhysicalUnionAll *PopConvert(COperator *pop);
/ check if required columns are included in output columns
BOOL FProvidesReqdCols(CExpressionHandle &exprhdl, CColRefSet *pcrsRequired,
ULONG ulOptReq) const override;
/-------------------------------------------------------------------------------------
/ Derived Plan Properties
/-------------------------------------------------------------------------------------
/ derive sort order
COrderSpec *PosDerive(CMemoryPool *mp,
CExpressionHandle &exprhdl) const override;
/ derive distribution
CDistributionSpec *PdsDerive(CMemoryPool *mp,
CExpressionHandle &exprhdl) const override;
/ derive rewindability
CRewindabilitySpec *PrsDerive(CMemoryPool *mp,
CExpressionHandle &exprhdl) const override;
/-------------------------------------------------------------------------------------
/ Enforced Properties
/-------------------------------------------------------------------------------------
/ return order property enforcing type for this operator
CEnfdProp::EPropEnforcingType EpetOrder(
CExpressionHandle &exprhdl, const CEnfdOrder *peo) const override;
/ return rewindability property enforcing type for this operator
CEnfdProp::EPropEnforcingType EpetRewindability(
CExpressionHandle &, / exprhdl
const CEnfdRewindability * / per
) const override;
};
} / namespace gpopt
#endif
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