Function col_str

datafusion/core/tests/sql/mod.rs:207–218

Specialized String representation

(column: &ArrayRef, row_index: usize)

/// Specialized String representation
fn col_str(column: &ArrayRef, row_index: usize) -> String {
    // NullArray::is_null() does not work on NullArray.
    // can remove check for DataType::Null when
    // https://github.com/apache/arrow-rs/issues/4835 is fixed
    if column.data_type() == &DataType::Null || column.is_null(row_index) {
        return "NULL".to_string();
    }

    array_value_to_string(column, row_index)
        .ok()
        .unwrap_or_else(|| "???".to_string())
}

/// Converts the results into a 2d array of strings, `result[row][column]`
/// Special cases nulls to NULL for testing