Function get_array_len 

pub fn get_array_len<B: Buf>(
    buf: &mut B,
    flexible: bool,
) -> Result<usize, ProtocolError>

Reads a non-nullable array length. Returns an error if the encoded value is null, which is −1 or 0.

Errors

Returns the underlying protocol error when input is truncated, contains an invalid length or tag, or cannot be encoded for the selected version.