alamb commented on issue #1610:
URL: 
https://github.com/apache/arrow-datafusion/issues/1610#issuecomment-1016866295


   `binary_array_op_scalar!` calls `compute_op_scalar!` 
https://github.com/apache/arrow-datafusion/blob/ad392fd529f9f8631b90271f7dbf3a4f2feadb7b/datafusion/src/physical_plan/expressions/binary.rs#L595-L601
 
   
   `compute_op_scalar!` then calls the `eq_scalar` or other kernel in 
https://github.com/apache/arrow-datafusion/blob/ad392fd529f9f8631b90271f7dbf3a4f2feadb7b/datafusion/src/physical_plan/expressions/binary.rs#L475-L489
   
   Specifically, this bit of macro magic:
   
https://github.com/apache/arrow-datafusion/blob/ad392fd529f9f8631b90271f7dbf3a4f2feadb7b/datafusion/src/physical_plan/expressions/binary.rs#L484
   Slaps a `_scalar` on to the argument
   
   So when invoked with `$OP = lt`, this
   ```rust
   paste::expr! {[<$OP _scalar>]}
   ```
   
   Becomes
   ```rust
   lt_scalar
   ```
   
   Does that help @matthewmturner ?
   


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