greenplumn CXformUnnestTVF 源码
greenplumn CXformUnnestTVF 代码
文件路径：/src/backend/gporca/libgpopt/include/gpopt/xforms/CXformUnnestTVF.h
//---------------------------------------------------------------------------
// Greenplum Database
// Copyright (C) 2013 EMC Corp.
//
// @filename:
// CXformUnnestTVF.h
//
// @doc:
// Unnest TVF with subquery arguments
//---------------------------------------------------------------------------
#ifndef GPOPT_CXformUnnestTVF_H
#define GPOPT_CXformUnnestTVF_H
#include "gpos/base.h"
#include "gpopt/xforms/CXformExploration.h"
namespace gpopt
{
using namespace gpos;
//---------------------------------------------------------------------------
// @class:
// CXformUnnestTVF
//
// @doc:
// Unnest TVF with subquery arguments
//
//---------------------------------------------------------------------------
class CXformUnnestTVF : public CXformExploration
{
private:
// helper for mapping subquery function arguments into columns
static CColRefArray *PdrgpcrSubqueries(CMemoryPool *mp,
CExpression *pexprCTEProducer,
CExpression *pexprCTEConsumer);
// collect subquery arguments and return a Project expression
static CExpression *PexprProjectSubqueries(CMemoryPool *mp,
CExpression *pexprTVF);
public:
CXformUnnestTVF(const CXformUnnestTVF &) = delete;
// ctor
explicit CXformUnnestTVF(CMemoryPool *mp);
// dtor
~CXformUnnestTVF() override = default;
// ident accessors
EXformId
Exfid() const override
{
return ExfUnnestTVF;
}
// return a string for xform name
const CHAR *
SzId() const override
{
return "CXformUnnestTVF";
}
// 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 CXformUnnestTVF
} // namespace gpopt
#endif // !GPOPT_CXformUnnestTVF_H
// EOF
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