alamb commented on code in PR #8651:
URL: https://github.com/apache/arrow-datafusion/pull/8651#discussion_r1436435521


##########
datafusion-cli/src/print_format.rs:
##########
@@ -159,14 +191,41 @@ impl PrintFormat {
         }
         Ok(())
     }
+
+    pub fn print_stream(&self, batch: &RecordBatch, with_header: bool) -> 
Result<()> {

Review Comment:
   Specifically, I think you could write the functions in terms of 
`std::io::Write` and then pass in 
https://doc.rust-lang.org/std/io/fn.stdout.html to avoid having to both copy 
the code and the code could avoid copying strings



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