alamb opened a new pull request #1075:
URL: https://github.com/apache/arrow-datafusion/pull/1075


   # Which issue does this PR close?
   
   Resolves https://github.com/apache/arrow-datafusion/issues/1074
   
    # Rationale for this change
   I have code in IOx (https://github.com/influxdata/influxdb_iox/pull/2756) 
that builds up custom plans using `LogicalPlanBuilder` and for one of those 
steps I find myself needing to `cast` expressions (will link PR) but casting 
requires access to the input schema for which I have to use code like this:
   
   
   ```rust
   let temp_plan = plan_builder.build().unwrap();
   let schema = temp_plan.schema();
   ```
   
   I would like a function so I can do
   ```rust
   let schema = plan_builder.schema();
   ```
   
   
   # What changes are included in this PR?
   Add `LogicalPlanBuilder::schema()` function
   
   # Are there any user-facing changes?
   
   Yes there is new function, so it is backwards compatible


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