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
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