## sql.Unsupported


The plan is outside the Lean model, or the dialect cannot express it.


Usage

``` python
sql.Unsupported()
```


Raised by [sverify.engines.to_sql](engines.to_sql.md#sverify.engines.to_sql), and so by [sverify.engines.run](engines.run.md#sverify.engines.run) on DuckDB and Spark, and by [Node.to_sql](Node.to_sql.md#sverify.Node.to_sql) and [Report.to_sql](Report.to_sql.md#sverify.Report.to_sql); the message says which construct, and for a dialect, why (e.g. Snowflake tables have no row order, so a `FETCH` cannot follow the model's). A subclass of `ValueError`, and of [sverify.errors.Unsupported](errors.Unsupported.md#sverify.errors.Unsupported), which every refusal raises.