Method register_udwf

datafusion/core/src/execution/context/mod.rs:1652–1654

Registers a window UDF within this context. Note in SQL queries, window function names are looked up using lowercase unless the query uses quotes. For example, - `SELECT MY_UDWF(x)...` will look for a window function named `"my_udwf"` - `SELECT "my_UDWF"(x)` will look for a window function named `"my_UDWF"`

(&self, f: WindowUDF)

    /// - `SELECT MY_UDWF(x)...` will look for a window function named `"my_udwf"`
    /// - `SELECT "my_UDWF"(x)` will look for a window function named `"my_UDWF"`
    pub fn register_udwf(&self, f: WindowUDF) {
        self.state.write().register_udwf(Arc::new(f)).ok();
    }

    #[cfg(feature = "sql")]
    /// Registers a [`RelationPlanner`] to customize SQL table-factor planning.