andygrove commented on a change in pull request #923:
URL: https://github.com/apache/arrow-datafusion/pull/923#discussion_r693514881
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File path: datafusion/src/dataframe.rs
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@@ -223,6 +223,21 @@ pub trait DataFrame: Send + Sync {
/// ```
async fn collect(&self) -> Result<Vec<RecordBatch>>;
+ /// Print results.
+ ///
+ /// ```
+ /// # use datafusion::prelude::*;
+ /// # use datafusion::error::Result;
+ /// # #[tokio::main]
+ /// # async fn main() -> Result<()> {
+ /// let mut ctx = ExecutionContext::new();
+ /// let df = ctx.read_csv("tests/example.csv", CsvReadOptions::new())?;
+ /// df.show().await?;
+ /// # Ok(())
+ /// # }
+ /// ```
+ async fn show(&self) -> Result<()>;
Review comment:
It would be nice if we could have similar behavior to Spark, where the
default for `show` is to just show the first 20 rows.
```scala
def show(numRows: Int): Unit = show(numRows, truncate = true)
def show(): Unit = show(20)
```
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