Function arrow_count

nodedb/src/control/arrow_convert.rs:216–220

Compute COUNT of non-null values in a column.

(batch: &RecordBatch, column_name: &str)

/// Compute COUNT of non-null values in a column.
pub fn arrow_count(batch: &RecordBatch, column_name: &str) -> Option<usize> {
    let idx = batch.schema().index_of(column_name).ok()?;
    let array = batch.column(idx);
    Some(array.len() - array.null_count())
}

/// Compute AVG of a numeric column (SUM / COUNT).
pub fn arrow_avg(batch: &RecordBatch, column_name: &str) -> Option<f64> {