greenplumn CPattern 源码
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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