包括 MakeValid() 在内的 SQL 语句破坏了服务器

如何解决包括 MakeValid() 在内的 SQL 语句破坏了服务器

我认为这是 sql Server 中 MakeValid() 的一个有趣错误，我在 sql Server 2016 和 2019 中尝试过。以下 sql 将破坏您的 sql Server，您将不得不终止 sql Server 服务。这个几何体没有什么特别之处。在过去的 5 年中，我们一直在使用数百万个几何图形来执行此操作，但发现大海捞针会导致服务器宕机。

declare @wkt nvarchar(max) = 'MULTILInesTRING ((-78.063088844296 39.0923128276227,-78.0629933704493 39.0924209049056,-78.0628537704575 39.0925804994165,-78.0626985415764 39.0927655959674,-78.0625776031863 39.0929093443343,-78.0624772451994 39.0930271271681,-78.0624404735616 39.093069429965,-78.06242230244 39.0931060149791,-78.062417726422 39.0931460260255,-78.0624230534316 39.0931855915373,-78.0624414338606 39.0932160425133,-78.0624617321928 39.0932363736011,-78.0624857549401 39.0932547887746,-78.0625955308645 39.0933174085555,-78.0628091268828 39.0934413211804,-78.0623615448858 39.0939008841112,-78.0618945628718 39.0943812788732,-78.0621603492116 39.094522628407,-78.0625166974101 39.0947133754383,-78.0627689030194 39.0948489021124,-78.0630246488892 39.0949866567258,-78.0632038915344 39.0950820335129,-78.0632954936423 39.095126900709,-78.0633505648608 39.0951567951925,-78.0635673364237 39.0952755726356,-78.063682189626 39.0953377527927),(-78.0636821896416 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declare @g geometry = geometry::STGeomFromText(@wkt,4326)
select @g.MakeValid()

有人遇到过这种情况吗？

解决方法

根据文档：MultiLineString - Valid Instances 此输入形状 不能 作为单个 MultiLineString 有效，因为它违反了以下两个标准：

要使 MultiLineString 实例有效，它必须满足以下条件：

• 构成 MultiLineString 实例的所有实例都必须是有效的 LineString 实例。

• 组成 MultiLineString 实例的两个 LineString 实例不能在一个间隔内重叠。 LineString 实例只能在有限数量的点处与自身或其他 LineString 实例相交或接触。 ，也不能使其有效。

因此，要使其有效，首先您必须使所有组件行独立有效，然后您可能仍会遇到第二个约束的问题，这很难在简单的证明中显示，但是当您渲染所有这些时行独立很明显，它们中的大多数直接相互重叠：

我们可以（并且应该）使用 GEOGRAPHY 代替 GEOMETRY，因为这些点闻起来像 GPS 坐标，但我们可以轻松地使用 {{1}生成线条的扩展表示以尝试详细说明相交区域：

所以在这里我尝试用括号中与同一组中其他线相交的数量来标记这些线，例如 STBuffer() 表示该组中的第 14 条线在某个点与其他 4 条线相交.

第 13 行和第 16 行是最严重的违规行为，每行都与其他 13 行相交。

例如第 13 行：

我没有研究过，但 MakeValid() 可能尝试了多种算法来强制使一行或 MultiLineString 有效。可以通过更改系列中的起点、检测闭合和重叠或反转 Left Hand Rule 的方向来假设。

但是在这个给定的数据集中，重叠的线代表了一个堆栈溢出异常，因为有无数的排列来尝试解决冲突。

我能捕获的最接近的错误是这个 14:(4):

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将此报告为错误的问题在于我们只有在它失败后才真正知道它是一个错误，在运行时中构建一些复杂性来处理这个问题是违反直觉的，或者至少它会导致引入或使用环境变量或查询提示（如 Insufficient memory to continue the execution of the program 或 MAXDOP）以允许调用者控制在 MakeValid() 失败之前应该允许的工作量或时间。

在这种情况下，很明显多条线在许多段上相交，MAXRECURSION 不是表示此数据的有效形状类型，而是应将其作为 MultiLineString 的多条记录处理

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在这个证明中使用了以下 SQL，最初我发现只有 2 行本身是隐式有效的，以下覆盖了这些行，所以我们可以看到它们仍然会违反 MultiLineString 标准，无论它们的有效性如何：>

LineString