Method union

datafusion/core/src/dataframe/mod.rs:764–773

Calculate the union of two [`DataFrame`]s, preserving duplicate rows. The two [`DataFrame`]s must have exactly the same schema # Example ``` # use datafusion::prelude::*; # use datafusion::error::Result; # use datafusion_common::assert_batches_sorted_eq; # #[tokio::main] # async fn main() -> Result<()> { let ctx = SessionContext::new(); let df = ctx .read_csv("tests/data/example.csv", CsvReadOpt

(self, dataframe: DataFrame)

    /// # }
    /// ```
    pub fn union(self, dataframe: DataFrame) -> Result<DataFrame> {
        let plan = LogicalPlanBuilder::from(self.plan)
            .union(dataframe.plan)?
            .build()?;
        Ok(DataFrame {
            session_state: self.session_state,
            plan,
            projection_requires_validation: true,
        })
    }

    /// Calculate the union of two [`DataFrame`]s using column names, preserving duplicate rows.
    ///