diff --git a/src/utils/qdf/reduce_df.rs b/src/utils/qdf/reduce_df.rs
index 0f510dc..54686b2 100644
--- a/src/utils/qdf/reduce_df.rs
+++ b/src/utils/qdf/reduce_df.rs
@@ -30,12 +30,12 @@ pub fn reduce_dataframe(
     let df_size = df.shape();
     let mut new_df = df.clone();
 
-    let ticker_col: Column = get_ticker_column_for_quantamental_dataframe(&new_df)?;
+    let ticker_col = get_ticker_column_for_quantamental_dataframe(&new_df)?;
 
     // if cids is not provided, get all unique cids
-    let u_cids: Vec<String> = get_unique_cids(&new_df)?;
-    let u_xcats: Vec<String> = get_unique_xcats(&new_df)?;
-    let u_tickers: Vec<String> = _get_unique_strs_from_str_column_object(&ticker_col)?;
+    let u_cids = get_unique_cids(&new_df)?;
+    let u_xcats = get_unique_xcats(&new_df)?;
+    let u_tickers = _get_unique_strs_from_str_column_object(&ticker_col)?;
 
     let cids_vec = cids.unwrap_or_else(|| u_cids.clone());
     let specified_cids: Vec<&str> = cids_vec.iter().map(AsRef::as_ref).collect();