Re: [I] Generate an Expr from string [arrow-datafusion]

["alamb (via GitHub)" <gi...@apache.org>]

alamb commented on issue #8736:
URL: https://github.com/apache/arrow-datafusion/issues/8736#issuecomment-1984495896

   I think you can do this today via [`SqlToRel::sql_to_expr`](https://docs.rs/datafusion/latest/datafusion/sql/planner/struct.SqlToRel.html#method.sql_to_expr) 
   
   
   ## Step 1:  Add an example to show how to use `SqlToRel::sql_to_expr`
   
    So add  an example (perhaps `expr_to_sql.rs`) in
   https://github.com/apache/arrow-datafusion/tree/main/datafusion-examples/examples that showed how to call `SqlToRel` to parser the expression above
   
   ## Step 2: Add an API to DataFusion that made parsing SQL easier 
   
   The idea is to avoid requiring  PlannerContext, a `DFSchema`, etc). 
   
   For example:
   ```rust
   let expr: Expr = parse_expr("c < 5")?;
   ```
   
   Note this doesn't provide a schema. 
   


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