pg999 opened a new issue, #18578:
URL: https://github.com/apache/datafusion/issues/18578

   ### Describe the bug
   
   It seems that literals and any built-in/custom udaf are not working on 
custom datasource. 
   
   ### To Reproduce
   
   Use this as your custom datasource 
   
https://github.com/apache/datafusion/blob/main/datafusion-examples/examples/custom_data_source/custom_datasource.rs
   
   and try this
   
   ```
   ctx.register_table("test", Arc::new(db.clone()))?;
   
   let x = ctx.sql("select * from test").await?.collect().await?;
   
   arrow::util::pretty::print_batches(&x)?;
   ```
   
   which will work, but this 👇 
   
   ```
   ctx.register_table("test", Arc::new(db.clone()))?;
   let x = ctx.sql("select 1 a from test").await?.collect().await?;
   arrow::util::pretty::print_batches(&x)?;
   ```
   or this 👇 
   
   ```
   ctx.register_table("test", Arc::new(db.clone()))?;
   let x = ctx.sql("select COUNT(a) from test").await?.collect().await?;
   arrow::util::pretty::print_batches(&x)?;
   ```
   
   fails...
   
   ### Expected behavior
   
   _No response_
   
   ### Additional context
   
   _No response_


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