update polars (#5791)

crates/nu-command/src/dataframe/eager/open.rs

@@ -155,7 +155,7 @@ fn from_json(
     call: &Call,
 ) -> Result<polars::prelude::DataFrame, ShellError> {
     let file: Spanned<PathBuf> = call.req(engine_state, stack, 0)?;
-    let mut file = File::open(&file.item).map_err(|e| {
+    let file = File::open(&file.item).map_err(|e| {
         ShellError::GenericError(
             "Error opening file".into(),
             e.to_string(),
@@ -165,7 +165,7 @@ fn from_json(
         )
     })?;
 
-    let buf_reader = BufReader::new(&mut file);
+    let buf_reader = BufReader::new(file);
     let reader = JsonReader::new(buf_reader);
 
     reader.finish().map_err(|e| {

crates/nu-command/src/dataframe/eager/sample.rs

@@ -40,6 +40,7 @@ impl Command for SampleDF {
                 Some('s'),
             )
             .switch("replace", "sample with replace", Some('e'))
+            .switch("shuffle", "shuffle sample", Some('u'))
             .category(Category::Custom("dataframe".into()))
     }
 
@@ -89,22 +90,26 @@ fn command(
         .get_flag::<i64>(engine_state, stack, "seed")?
         .map(|val| val as u64);
     let replace: bool = call.has_flag("replace");
+    let shuffle: bool = call.has_flag("shuffle");
 
     let df = NuDataFrame::try_from_pipeline(input, call.head)?;
 
     match (rows, fraction) {
-        (Some(rows), None) => df.as_ref().sample_n(rows.item, replace, seed).map_err(|e| {
-            ShellError::GenericError(
-                "Error creating sample".into(),
-                e.to_string(),
-                Some(rows.span),
-                None,
-                Vec::new(),
-            )
-        }),
+        (Some(rows), None) => df
+            .as_ref()
+            .sample_n(rows.item, replace, shuffle, seed)
+            .map_err(|e| {
+                ShellError::GenericError(
+                    "Error creating sample".into(),
+                    e.to_string(),
+                    Some(rows.span),
+                    None,
+                    Vec::new(),
+                )
+            }),
         (None, Some(frac)) => df
             .as_ref()
-            .sample_frac(frac.item, replace, seed)
+            .sample_frac(frac.item, replace, shuffle, seed)
             .map_err(|e| {
                 ShellError::GenericError(
                     "Error creating sample".into(),

crates/nu-command/src/dataframe/eager/to_csv.rs

@@ -99,7 +99,7 @@ fn command(
         writer.has_header(true)
     };
 
-    let writer = match delimiter {
+    let mut writer = match delimiter {
         None => writer,
         Some(d) => {
             if d.item.len() != 1 {