greenplumn CScalarArrayRef 代码
文件路径：/src/backend/gporca/libgpopt/include/gpopt/operators/CScalarArrayRef.h
/---------------------------------------------------------------------------
/ Greenplum Database
/ Copyright (C) 2014 VMware, Inc. or its affiliates.
/
/ @filename:
/ CScalarArrayRef.h
/
/ @doc:
/ Class for scalar arrayref
/---------------------------------------------------------------------------
#ifndef GPOPT_CScalarArrayRef_H
#define GPOPT_CScalarArrayRef_H
#include "gpos/base.h"
#include "gpopt/operators/CScalar.h"
#include "naucrates/md/IMDId.h"
namespace gpopt
{
using namespace gpos;
using namespace gpmd;
/---------------------------------------------------------------------------
/ @class:
/ CScalarArrayRef
/
/ @doc:
/ Scalar arrayref
/
/ Arrayrefs are used to reference array elements or subarrays
/ e.g. select a[1], b[1][2][3], c[3:5], d[1:2][4:9] from arrtest;
/
/---------------------------------------------------------------------------
class CScalarArrayRef : public CScalar
{
private:
/ element type id
IMDId *m_pmdidElem;
/ element type modifier
INT m_type_modifier;
/ array type id
IMDId *m_pmdidArray;
/ return type id
IMDId *m_mdid_type;
public:
CScalarArrayRef(const CScalarArrayRef &) = delete;
/ ctor
CScalarArrayRef(CMemoryPool *mp, IMDId *elem_type_mdid, INT type_modifier,
IMDId *array_type_mdid, IMDId *return_type_mdid);
/ dtor
~CScalarArrayRef() override;
/ ident accessors
EOperatorId
Eopid() const override
{
return EopScalarArrayRef;
}
/ operator name
const CHAR *
SzId() const override
{
return "CScalarArrayRef";
}
/ element type id
IMDId *
PmdidElem() const
{
return m_pmdidElem;
}
/ element type modifier
INT TypeModifier() const override;
/ array type id
IMDId *
PmdidArray() const
{
return m_pmdidArray;
}
/ operator specific hash function
ULONG HashValue() const override;
/ match function
BOOL Matches(COperator *pop) const override;
/ 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
{
return PopCopyDefault();
}
/ type of expression's result
IMDId *
MdidType() const override
{
return m_mdid_type;
}
/ conversion function
static CScalarArrayRef *
PopConvert(COperator *pop)
{
GPOS_ASSERT(nullptr != pop);
GPOS_ASSERT(EopScalarArrayRef == pop->Eopid());
return dynamic_cast<CScalarArrayRef *>(pop);
}
}; / class CScalarArrayRef
} / namespace gpopt
#endif / !GPOPT_CScalarArrayRef_H
/ EOF
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