The space available property is not computed correctly

The Database.SpaceAvailable property is not computed correctly. The reason for this issue is that the input used in the calculation of this property, as seen in the source code, relies on a join operation between the sys.allocation_units and sys.partitions DMVs. However, this inner join is incompatible with columnstore indexes, as clearly documented in the official documentation. Consequently, the size is inaccurately computed for databases using columnstores. The solution is straightforward: remove this incompatible join operation from the calculation.

从 src/Microsoft/SqlServer/Management/SqlEnum/PostProcessDatabaseInsideAttribs.cs 中 Database.SpaceAvailable 的相关计算开始。检查 sys.allocation_units 和 sys.partitions 的连接方式，然后针对使用列存储索引的数据库验证结果。完成标准是该属性在没有不兼容连接的情况下报告正确的可用空间。