Method num_columns

arrow-array/src/record_batch.rs:594–596

Returns the number of columns in the record batch. # Example ``` # use std::sync::Arc; # use arrow_array::{Int32Array, RecordBatch}; # use arrow_schema::{DataType, Field, Schema}; let id_array = Int32Array::from(vec![1, 2, 3, 4, 5]); let schema = Schema::new(vec![ Field::new("id", DataType::Int32, false) ]); let batch = RecordBatch::try_new(Arc::new(schema), vec![Arc::new(id_array)]).unwrap();

(&self)

    /// assert_eq!(batch.num_columns(), 1);
    /// ```
    pub fn num_columns(&self) -> usize {
        self.columns.len()
    }

    /// Returns the number of rows in each column.
    ///