greenplumn CScalarProjectElement 代码
文件路径：/src/backend/gporca/libgpopt/src/operators/CScalarProjectElement.cpp
/---------------------------------------------------------------------------
/ Greenplum Database
/ Copyright (C) 2011 Greenplum, Inc.
/
/ @filename:
/ CScalarProjectElement.cpp
/
/ @doc:
/ Implementation of scalar project operator
/---------------------------------------------------------------------------
#include "gpopt/operators/CScalarProjectElement.h"
#include "gpos/base.h"
#include "gpopt/base/CColRefSet.h"
#include "gpopt/base/COptCtxt.h"
using namespace gpopt;
/---------------------------------------------------------------------------
/ @function:
/ CScalarProjectElement::HashValue
/
/ @doc:
/ Hash value built from colref and Eop
/
/---------------------------------------------------------------------------
ULONG
CScalarProjectElement::HashValue() const
{
return gpos::CombineHashes(COperator::HashValue(),
gpos::HashPtr<CColRef>(m_pcr));
}
/---------------------------------------------------------------------------
/ @function:
/ CScalarProjectElement::Matches
/
/ @doc:
/ Match function on operator level
/
/---------------------------------------------------------------------------
BOOL
CScalarProjectElement::Matches(COperator *pop) const
{
if (pop->Eopid() == Eopid())
{
CScalarProjectElement *popScPrEl =
CScalarProjectElement::PopConvert(pop);
/ match if column reference is same
return Pcr() == popScPrEl->Pcr();
}
return false;
}
/---------------------------------------------------------------------------
/ @function:
/ CScalarProjectElement::FInputOrderSensitive
/
/ @doc:
/ Not called for leaf operators
/
/---------------------------------------------------------------------------
BOOL
CScalarProjectElement::FInputOrderSensitive() const
{
return false;
}
/---------------------------------------------------------------------------
/ @function:
/ CScalarProjectElement::PopCopyWithRemappedColumns
/
/ @doc:
/ Return a copy of the operator with remapped columns
/
/---------------------------------------------------------------------------
COperator *
CScalarProjectElement::PopCopyWithRemappedColumns(
CMemoryPool *mp, UlongToColRefMap *colref_mapping, BOOL must_exist)
{
ULONG id = m_pcr->Id();
CColRef *colref = colref_mapping->Find(&id);
if (nullptr == colref)
{
if (must_exist)
{
/ not found in hashmap, so create a new colref and add to hashmap
CColumnFactory *col_factory = COptCtxt::PoctxtFromTLS()->Pcf();
CName name(m_pcr->Name());
colref = col_factory->PcrCreate(m_pcr->RetrieveType(),
m_pcr->TypeModifier(), name);
BOOL result GPOS_ASSERTS_ONLY =
colref_mapping->Insert(GPOS_NEW(mp) ULONG(id), colref);
GPOS_ASSERT(result);
}
else
{
colref = m_pcr;
}
}
return GPOS_NEW(mp) CScalarProjectElement(mp, colref);
}
/---------------------------------------------------------------------------
/ @function:
/ CScalarProjectElement::OsPrint
/
/ @doc:
/ debug print
/
/---------------------------------------------------------------------------
IOstream &
CScalarProjectElement::OsPrint(IOstream &os) const
{
os << SzId() << " ";
m_pcr->OsPrint(os);
return os;
}
/ EOF
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