greenplumn CBinding 源码
greenplumn CBinding 代码
文件路径：/src/backend/gporca/libgpopt/include/gpopt/search/CBinding.h
//---------------------------------------------------------------------------
// Greenplum Database
// Copyright (C) 2009 Greenplum, Inc.
//
// @filename:
// CBinding.h
//
// @doc:
// Binding mechanism to extract expression from Memo according to pattern
//---------------------------------------------------------------------------
#ifndef GPOPT_CBinding_H
#define GPOPT_CBinding_H
#include "gpos/base.h"
#include "gpopt/operators/CExpression.h"
namespace gpopt
{
using namespace gpos;
// fwd declaration
class CGroupExpression;
class CGroup;
//---------------------------------------------------------------------------
// @class:
// CBinding
//
// @doc:
// Binding class used to iteratively generate expressions from the
// memo so that they match a given pattern
//
//
//---------------------------------------------------------------------------
class CBinding
{
private:
// initialize cursors of child expressions
BOOL FInitChildCursors(CMemoryPool *mp, CGroupExpression *pgexpr,
CExpression *pexprPattern,
CExpressionArray *pdrgpexpr);
// advance cursors of child expressions
BOOL FAdvanceChildCursors(CMemoryPool *mp, CGroupExpression *pgexpr,
CExpression *pexprPattern, CExpression *pexprLast,
CExpressionArray *pdrgpexpr);
// extraction of child expressions
BOOL FExtractChildren(CMemoryPool *mp, CExpression *pexprPattern,
CGroupExpression *pgexprCursor,
CExpressionArray *pdrgpexpr);
// move cursor
static CGroupExpression *PgexprNext(CGroup *pgroup,
CGroupExpression *pgexpr);
// expand n-th child of pattern
static CExpression *PexprExpandPattern(CExpression *pexpr, ULONG ulPos,
ULONG arity);
// get binding for children
BOOL FExtractChildren(CMemoryPool *mp, CGroupExpression *pgexpr,
CExpression *pexprPattern, CExpression *pexprLast,
CExpressionArray *pdrgpexprChildren);
// extract binding from a group
CExpression *PexprExtract(CMemoryPool *mp, CGroup *pgroup,
CExpression *pexprPattern,
CExpression *pexprLast);
// build expression
static CExpression *PexprFinalize(CMemoryPool *mp, CGroupExpression *pgexpr,
CExpressionArray *pdrgpexprChildren);
// private copy ctor
CBinding(const CBinding &);
public:
// ctor
CBinding() = default;
// dtor
~CBinding() = default;
// extract binding from group expression
CExpression *PexprExtract(CMemoryPool *mp, CGroupExpression *pgexpr,
CExpression *pexprPatetrn,
CExpression *pexprLast);
}; // class CBinding
} // namespace gpopt
#endif // !GPOPT_CBinding_H
// EOF
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