diff --git a/fastfield_codecs/src/lib.rs b/fastfield_codecs/src/lib.rs
index 602c7fda0..deb3e7943 100644
--- a/fastfield_codecs/src/lib.rs
+++ b/fastfield_codecs/src/lib.rs
@@ -90,6 +90,7 @@ pub struct FastFieldStats {
     pub num_vals: u64,
 }
 
+#[cfg(test)]
 impl<'a> Column for &'a [u64] {
     fn get_val(&self, position: u64) -> u64 {
         self[position as usize]
@@ -112,26 +113,6 @@ impl<'a> Column for &'a [u64] {
     }
 }
 
-impl Column for Vec<u64> {
-    fn get_val(&self, position: u64) -> u64 {
-        self[position as usize]
-    }
-    fn iter<'b>(&'b self) -> Box<dyn Iterator<Item = u64> + 'b> {
-        Box::new((self as &[u64]).iter().cloned())
-    }
-    fn min_value(&self) -> u64 {
-        self.iter().min().unwrap_or(0)
-    }
-
-    fn max_value(&self) -> u64 {
-        self.iter().max().unwrap_or(0)
-    }
-
-    fn num_vals(&self) -> u64 {
-        self.len() as u64
-    }
-}
-
 #[cfg(test)]
 mod tests {
     use proptest::arbitrary::any;
@@ -235,6 +216,7 @@ mod tests {
     fn estimation_good_interpolation_case() {
         let data = (10..=20000_u64).collect::<Vec<_>>();
 
+        let data = data.as_slice();
         let linear_interpol_estimation = LinearCodec::estimate(&data).unwrap();
         assert_le!(linear_interpol_estimation, 0.01);
 
@@ -247,7 +229,7 @@ mod tests {
     }
     #[test]
     fn estimation_test_bad_interpolation_case() {
-        let data = vec![200, 10, 10, 10, 10, 1000, 20];
+        let data: &[u64] = &[200, 10, 10, 10, 10, 1000, 20];
 
         let linear_interpol_estimation = LinearCodec::estimate(&data).unwrap();
         assert_le!(linear_interpol_estimation, 0.32);
@@ -259,6 +241,7 @@ mod tests {
     fn estimation_test_bad_interpolation_case_monotonically_increasing() {
         let mut data: Vec<u64> = (200..=20000_u64).collect();
         data.push(1_000_000);
+        let data = data.as_slice();
 
         // in this case the linear interpolation can't in fact not be worse than bitpacking,
         // but the estimator adds some threshold, which leads to estimated worse behavior
diff --git a/fastfield_codecs/src/main.rs b/fastfield_codecs/src/main.rs
index 848392b66..cbe5b3198 100644
--- a/fastfield_codecs/src/main.rs
+++ b/fastfield_codecs/src/main.rs
@@ -3,9 +3,33 @@ extern crate prettytable;
 use fastfield_codecs::bitpacked::BitpackedCodec;
 use fastfield_codecs::blockwise_linear::BlockwiseLinearCodec;
 use fastfield_codecs::linear::LinearCodec;
-use fastfield_codecs::{FastFieldCodec, FastFieldCodecType, FastFieldStats};
+use fastfield_codecs::{Column, FastFieldCodec, FastFieldCodecType, FastFieldStats};
 use prettytable::{Cell, Row, Table};
 
+struct Data<'a>(&'a [u64]);
+
+impl<'a> Column for Data<'a> {
+    fn get_val(&self, position: u64) -> u64 {
+        self.0[position as usize]
+    }
+
+    fn iter<'b>(&'b self) -> Box<dyn Iterator<Item = u64> + 'b> {
+        Box::new(self.0.iter().cloned())
+    }
+
+    fn min_value(&self) -> u64 {
+        *self.0.iter().min().unwrap_or(&0)
+    }
+
+    fn max_value(&self) -> u64 {
+        *self.0.iter().max().unwrap_or(&0)
+    }
+
+    fn num_vals(&self) -> u64 {
+        self.0.len() as u64
+    }
+}
+
 fn main() {
     let mut table = Table::new();
 
@@ -86,10 +110,11 @@ pub fn get_codec_test_data_sets() -> Vec<(Vec<u64>, &'static str)> {
 pub fn serialize_with_codec<C: FastFieldCodec>(
     data: &[u64],
 ) -> Option<(f32, f32, FastFieldCodecType)> {
+    let data = Data(data);
     let estimation = C::estimate(&data)?;
     let mut out = Vec::new();
     C::serialize(&mut out, &data).unwrap();
-    let actual_compression = out.len() as f32 / (data.len() * 8) as f32;
+    let actual_compression = out.len() as f32 / (data.num_vals() * 8) as f32;
     Some((estimation, actual_compression, C::CODEC_TYPE))
 }
 
diff --git a/src/indexer/merger.rs b/src/indexer/merger.rs
index a3d6f9408..fa2bac324 100644
--- a/src/indexer/merger.rs
+++ b/src/indexer/merger.rs
@@ -133,7 +133,7 @@ impl TermOrdinalMapping {
     fn max_term_ord(&self) -> TermOrdinal {
         self.per_segment_new_term_ordinals
             .iter()
-            .flat_map(|term_ordinals| term_ordinals.iter().max())
+            .flat_map(|term_ordinals| term_ordinals.iter().max().cloned())
             .max()
             .unwrap_or_default()
     }
@@ -784,7 +784,7 @@ impl IndexMerger {
                 let new_doc_id: DocId =
                     self.offsets
                         .iter()
-                        .position(|offset| offset > pos)
+                        .position(|&offset| offset > pos)
                         .expect("pos is out of bounds") as DocId
                         - 1u32;