greenplumn CXformInnerApplyWithOuterKey2InnerJoin 源码
greenplumn CXformInnerApplyWithOuterKey2InnerJoin 代码
文件路径：/src/backend/gporca/libgpopt/include/gpopt/xforms/CXformInnerApplyWithOuterKey2InnerJoin.h
//---------------------------------------------------------------------------
// Greenplum Database
// Copyright (C) 2012 EMC Corp.
//
// @filename:
// CXformInnerApplyWithOuterKey2InnerJoin.h
//
// @doc:
// Turn inner apply into inner join under the condition that
// outer child of apply has key
//---------------------------------------------------------------------------
#ifndef GPOPT_CXformInnerApplyWithOuterKey2InnerJoin_H
#define GPOPT_CXformInnerApplyWithOuterKey2InnerJoin_H
#include "gpos/base.h"
#include "gpopt/xforms/CDecorrelator.h"
#include "gpopt/xforms/CXformExploration.h"
namespace gpopt
{
using namespace gpos;
//---------------------------------------------------------------------------
// @class:
// CXformInnerApplyWithOuterKey2InnerJoin
//
// @doc:
// Transform inner apply into inner join under the condition that
// outer child of apply has key
//
//---------------------------------------------------------------------------
class CXformInnerApplyWithOuterKey2InnerJoin : public CXformExploration
{
private:
public:
CXformInnerApplyWithOuterKey2InnerJoin(
const CXformInnerApplyWithOuterKey2InnerJoin &) = delete;
// ctor
explicit CXformInnerApplyWithOuterKey2InnerJoin(CMemoryPool *mp);
// dtor
~CXformInnerApplyWithOuterKey2InnerJoin() override = default;
// transformation promise
EXformPromise Exfp(CExpressionHandle &exprhdl) const override;
// ident accessors
EXformId
Exfid() const override
{
return ExfInnerApplyWithOuterKey2InnerJoin;
}
const CHAR *
SzId() const override
{
return "CXformInnerApplyWithOuterKey2InnerJoin";
}
// is transformation an Apply decorrelation (Apply To Join) xform?
BOOL
FApplyDecorrelating() const override
{
return true;
}
// actual transform
void Transform(CXformContext *pxfctxt, CXformResult *pxfres,
CExpression *pexpr) const override;
}; // class CXformInnerApplyWithOuterKey2InnerJoin
} // namespace gpopt
#endif // !GPOPT_CXformInnerApplyWithOuterKey2InnerJoin_H
// EOF
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