greenplumn CPattern 代码
文件路径：/src/backend/gporca/libgpopt/src/operators/CPattern.cpp
/---------------------------------------------------------------------------
/ Greenplum Database
/ Copyright (C) 2009 Greenplum, Inc.
/
/ @filename:
/ CPattern.cpp
/
/ @doc:
/ Implementation of base class of pattern operators
/---------------------------------------------------------------------------
#include "gpopt/operators/CPattern.h"
#include "gpos/base.h"
using namespace gpopt;
/---------------------------------------------------------------------------
/ @function:
/ CPattern::PdpCreate
/
/ @doc:
/ Pattern operators cannot derive properties; the assembly of the
/ expression has to take care of this on a higher level
/
/---------------------------------------------------------------------------
CDrvdProp *
CPattern::PdpCreate(CMemoryPool * / mp
) const
{
GPOS_ASSERT(!"Cannot derive properties on pattern");
return nullptr;
}
/---------------------------------------------------------------------------
/ @function:
/ CPattern::PrpCreate
/
/ @doc:
/ Pattern operators cannot compute required properties; the assembly of the
/ expression has to take care of this on a higher level
/
/---------------------------------------------------------------------------
CReqdProp *
CPattern::PrpCreate(CMemoryPool * / mp
) const
{
GPOS_ASSERT(!"Cannot compute required properties on pattern");
return nullptr;
}
/---------------------------------------------------------------------------
/ @function:
/ CPattern::Matches
/
/ @doc:
/ match against an operator
/
/---------------------------------------------------------------------------
BOOL
CPattern::Matches(COperator *pop) const
{
return Eopid() == pop->Eopid();
}
/---------------------------------------------------------------------------
/ @function:
/ CPattern::FInputOrderSensitive
/
/ @doc:
/ By default patterns are leaves; no need to call this function ever
/
/---------------------------------------------------------------------------
BOOL
CPattern::FInputOrderSensitive() const
{
GPOS_ASSERT(!"Unexpected call to function FInputOrderSensitive");
return true;
}
/---------------------------------------------------------------------------
/ @function:
/ CPattern::PopCopyWithRemappedColumns
/
/ @doc:
/ Return a copy of the operator with remapped columns
/
/---------------------------------------------------------------------------
COperator *
CPattern::PopCopyWithRemappedColumns(CMemoryPool *, /mp,
UlongToColRefMap *, /colref_mapping,
BOOL /must_exist
)
{
GPOS_ASSERT(
!"PopCopyWithRemappedColumns should not be called for a pattern");
return nullptr;
}
/ EOF
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