Columnar Overview

let mut result = conn.execute("SELECT n FROM range(5000) t(n)")?;
let mut total = 0_i64;
while let Some(chunk) = result.fetch_chunk() {
    let chunk = chunk?;                       // DataChunkHandle
    let n = chunk.len();                      // rows in this chunk
    let col = chunk.vector(0)?;               // VectorRef over column 0
    let data: &[i64] = col.as_slice(n)?;      // zero-copy &[i64]
    total += data.iter().copied().sum::<i64>();
}