Function create_hashes

datafusion/common/src/hash_utils.rs:1100–1115

Creates hash values for every row, based on the values in the columns. The number of rows to hash is determined by `hashes_buffer.len()`. `hashes_buffer` should be pre-sized appropriately.

(
    arrays: I,
    random_state: &RandomState,
    hashes_buffer: &'a mut [u64],
)

/// The number of rows to hash is determined by `hashes_buffer.len()`.
/// `hashes_buffer` should be pre-sized appropriately.
pub fn create_hashes<'a, I, T>(
    arrays: I,
    random_state: &RandomState,
    hashes_buffer: &'a mut [u64],
) -> Result<&'a mut [u64]>
where
    I: IntoIterator<Item = T>,
    T: AsDynArray,
{
    for (i, array) in arrays.into_iter().enumerate() {
        // combine hashes with `combine_hashes` for all columns besides the first
        let rehash = i >= 1;
        hash_single_array(array.as_dyn_array(), random_state, hashes_buffer, rehash)?;
    }
    Ok(hashes_buffer)
}

#[cfg(test)]
mod tests {