greenplumn CScalarArrayRef 源码
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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