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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