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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