Give BitsIter panic message more information

arrow/src/util/bit_util.rs

@@ -118,7 +118,7 @@ impl<'a> BitsIter<'a> {
     pub fn new(bytes: &'a [u8], offset: usize, len: usize) -> BitsIter<'a> {
         let end_offset = offset + len;
         if end_offset < offset || end_offset.div_ceil(8) > bytes.len() {
-            panic!("BitsIter::new called with invalid offset or len");
+            panic!("BitsIter::new called with invalid offset or len.  offset: {}, len: {}, bytes.len(): {}", offset, len, bytes.len());
         }
         BitsIter {
             bytes,