greenplumn CXformImplementFullOuterMergeJoin 源码
greenplumn CXformImplementFullOuterMergeJoin 代码
文件路径：/src/backend/gporca/libgpopt/include/gpopt/xforms/CXformImplementFullOuterMergeJoin.h
//---------------------------------------------------------------------------
// Greenplum Database
// Copyright (C) 2019 VMware, Inc. or its affiliates.
//
#ifndef GPOPT_CXformImplementFullOuterMergeJoin_H
#define GPOPT_CXformImplementFullOuterMergeJoin_H
#include "gpos/base.h"
#include "gpopt/xforms/CXformExploration.h"
namespace gpopt
{
using namespace gpos;
// FIXME: This should derive from CXformImplementation, but there is an unrelated bug
// with ImplementMergeJoin() that causes us to generate an invalid plan in some
// cases if we change this without fixing the bug.
class CXformImplementFullOuterMergeJoin : public CXformExploration
{
private:
public:
CXformImplementFullOuterMergeJoin(
const CXformImplementFullOuterMergeJoin &) = delete;
// ctor
explicit CXformImplementFullOuterMergeJoin(CMemoryPool *mp);
// dtor
~CXformImplementFullOuterMergeJoin() override = default;
// ident accessors
EXformId
Exfid() const override
{
return ExfImplementFullOuterMergeJoin;
}
// return a string for xform name
const CHAR *
SzId() const override
{
return "CXformImplementFullOuterMergeJoin";
}
// compute xform promise for a given expression handle
EXformPromise Exfp(CExpressionHandle &exprhdl) const override;
// actual transform
void Transform(CXformContext *pxfctxt, CXformResult *pxfres,
CExpression *pexpr) const override;
}; // class CXformImplementFullOuterMergeJoin
} // namespace gpopt
#endif // !GPOPT_CXformImplementFullOuterMergeJoin_H
// EOF
相关信息
相关文章
greenplumn CJoinOrderGreedy 源码
greenplumn CJoinOrderMinCard 源码
greenplumn CSubqueryHandler 源码
0
赞
热门推荐
-
2、 - 优质文章
-
3、 gate.io
-
8、 golang
-
9、 openharmony
-
10、 Vue中input框自动聚焦