Method alias

datafusion/core/src/dataframe/mod.rs:2415–2422

Apply an alias to the DataFrame. This method replaces the qualifiers of output columns with the given alias.

(self, alias: &str)

    ///
    /// This method replaces the qualifiers of output columns with the given alias.
    pub fn alias(self, alias: &str) -> Result<DataFrame> {
        let plan = LogicalPlanBuilder::from(self.plan).alias(alias)?.build()?;
        Ok(DataFrame {
            session_state: self.session_state,
            plan,
            projection_requires_validation: self.projection_requires_validation,
        })
    }

    /// Fill null values in specified columns with a given value
    /// If no columns are specified (empty vector), applies to all columns