greenplumn CPatternNode 源码
greenplumn CPatternNode 代码
文件路径：/src/backend/gporca/libgpopt/include/gpopt/operators/CPatternNode.h
//---------------------------------------------------------------------------
// Greenplum Database
// Copyright (c) 2020 VMware and affiliates, Inc.
//
// CPatternNode.h
//
// A node that matches multiple operators, to be used in patterns of xforms.
// The exact matching algorithm depends on an enum that is passed in the
// constructor.
//---------------------------------------------------------------------------
#ifndef GPOPT_CPatternNode_H
#define GPOPT_CPatternNode_H
#include "gpos/base.h"
#include "gpos/common/CRefCount.h"
#include "gpopt/operators/CPattern.h"
namespace gpopt
{
using namespace gpos;
//---------------------------------------------------------------------------
// CPatternNode
//
// An operator that can match multiple other operator types
//---------------------------------------------------------------------------
class CPatternNode : public CPattern
{
public:
enum EMatchType
{
EmtMatchInnerOrLeftOuterJoin,
EmtSentinel
};
enum EMatchType m_match;
public:
CPatternNode(COperator &) = delete;
// ctor
explicit CPatternNode(CMemoryPool *mp, enum EMatchType matchType)
: CPattern(mp), m_match(matchType)
{
}
// dtor
~CPatternNode() override = default;
// match function
BOOL
Matches(COperator *pop) const override
{
return Eopid() == pop->Eopid() &&
m_match == static_cast<CPatternNode *>(pop)->m_match;
}
// check if operator is a pattern leaf
BOOL
FLeaf() const override
{
return false;
}
// conversion function
static CPatternNode *
PopConvert(COperator *pop)
{
GPOS_ASSERT(nullptr != pop);
GPOS_ASSERT(COperator::EopPatternNode == pop->Eopid());
return static_cast<CPatternNode *>(pop);
}
// ident accessors
EOperatorId
Eopid() const override
{
return EopPatternNode;
}
// return a string for operator name
const CHAR *
SzId() const override
{
return "CPatternNode";
}
BOOL
MatchesOperator(enum COperator::EOperatorId opid) const
{
switch (m_match)
{
case EmtMatchInnerOrLeftOuterJoin:
return COperator::EopLogicalInnerJoin == opid ||
COperator::EopLogicalLeftOuterJoin == opid;
default:
return false;
}
}
}; // class CPatternNode
} // namespace gpopt
#endif // !GPOPT_CPatternNode_H
// EOF
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