viirya commented on code in PR #5071:
URL: https://github.com/apache/arrow-datafusion/pull/5071#discussion_r1087336452
##########
datafusion/core/src/dataframe.rs:
##########
@@ -361,6 +364,35 @@ impl DataFrame {
Ok(DataFrame::new(self.session_state, plan))
}
+ /// Run a count aggregate on the DataFrame and execute the DataFrame to
collect this
+ /// count and return it as a usize.
+ /// ```
+ /// # use datafusion::prelude::*;
+ /// # use datafusion::error::Result;
+ /// # #[tokio::main]
+ /// # async fn main() -> Result<()> {
+ /// let ctx = SessionContext::new();
+ /// let df = ctx.read_csv("tests/data/example.csv",
CsvReadOptions::new()).await?;
+ /// let length = df.len().await?;
+ /// # Ok(())
+ /// # }
+ /// ```
+ pub async fn len(self) -> Result<usize> {
Review Comment:
Hmm, could it be `count`? For DataFrame-like API (pandas, Spark, etc.),
there is commonly `count` for this.
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