diff --git a/Cargo.lock b/Cargo.lock
index f96458214b..4790141c14 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -216,16 +216,6 @@ version = "0.7.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "96d30a06541fbafbc7f82ed10c06164cfbd2c401138f6addd8404629c4b16711"
 
-[[package]]
-name = "arrow-format"
-version = "0.8.1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "07884ea216994cdc32a2d5f8274a8bee979cfe90274b83f86f440866ee3132c7"
-dependencies = [
- "planus",
- "serde",
-]
-
 [[package]]
 name = "assert-json-diff"
 version = "2.0.2"
@@ -2138,6 +2128,12 @@ version = "1.0.10"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "b1a46d1a171d865aa5f83f92695765caa047a9b4cbae2cbf37dbd613a793fd4c"
 
+[[package]]
+name = "itoap"
+version = "1.0.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "9028f49264629065d057f340a86acb84867925865f73bbf8d47b4d149a7e88b8"
+
 [[package]]
 name = "jobserver"
 version = "0.1.27"
@@ -3941,9 +3937,9 @@ dependencies = [
 
 [[package]]
 name = "polars"
-version = "0.36.2"
+version = "0.37.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "938048fcda6a8e2ace6eb168bee1b415a92423ce51e418b853bf08fc40349b6b"
+checksum = "e43795c49010cb851d45227caa17769e83760e21d260ba6285c563b754e1652f"
 dependencies = [
  "getrandom",
  "polars-core",
@@ -3957,16 +3953,17 @@ dependencies = [
 
 [[package]]
 name = "polars-arrow"
-version = "0.36.2"
+version = "0.37.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "ce68a02f698ff7787c261aea1b4c040a8fe183a8fb200e2436d7f35d95a1b86f"
+checksum = "faacd21a2548fa6d50c72d6b8d4649a8e029a0f3c6c5545b7f436f0610e49b0f"
 dependencies = [
  "ahash 0.8.7",
- "arrow-format",
+ "atoi",
  "atoi_simd",
  "avro-schema",
  "bytemuck",
  "chrono",
+ "chrono-tz",
  "dyn-clone",
  "either",
  "ethnum",
@@ -3976,9 +3973,11 @@ dependencies = [
  "getrandom",
  "hashbrown 0.14.3",
  "itoa",
+ "itoap",
  "lz4",
  "multiversion",
  "num-traits",
+ "polars-arrow-format",
  "polars-error",
  "polars-utils",
  "ryu",
@@ -3991,28 +3990,40 @@ dependencies = [
 ]
 
 [[package]]
-name = "polars-compute"
-version = "0.36.2"
+name = "polars-arrow-format"
+version = "0.1.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "b14fbc5f141b29b656a4cec4802632e5bff10bf801c6809c6bbfbd4078a044dd"
+checksum = "19b0ef2474af9396b19025b189d96e992311e6a47f90c53cd998b36c4c64b84c"
+dependencies = [
+ "planus",
+ "serde",
+]
+
+[[package]]
+name = "polars-compute"
+version = "0.37.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "32d9dc87f8003ae0edeef5ad9ac92b2a345480bbe17adad64496113ae84706dd"
 dependencies = [
  "bytemuck",
  "num-traits",
  "polars-arrow",
+ "polars-error",
  "polars-utils",
  "version_check",
 ]
 
 [[package]]
 name = "polars-core"
-version = "0.36.2"
+version = "0.37.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "d0f5efe734b6cbe5f97ea769be8360df5324fade396f1f3f5ad7fe9360ca4a23"
+checksum = "befd4d280a82219a01035c4f901319ceba65998c594d0c64f9a439cdee1d7777"
 dependencies = [
  "ahash 0.8.7",
  "bitflags 2.4.2",
  "bytemuck",
  "chrono",
+ "chrono-tz",
  "comfy-table",
  "either",
  "hashbrown 0.14.3",
@@ -4038,12 +4049,12 @@ dependencies = [
 
 [[package]]
 name = "polars-error"
-version = "0.36.2"
+version = "0.37.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "6396de788f99ebfc9968e7b6f523e23000506cde4ba6dfc62ae4ce949002a886"
+checksum = "50f2435b02d1ba36d8c1f6a722cad04e4c0b2705a3112c5706e6960d405d7798"
 dependencies = [
- "arrow-format",
  "avro-schema",
+ "polars-arrow-format",
  "regex",
  "simdutf8",
  "thiserror",
@@ -4051,9 +4062,9 @@ dependencies = [
 
 [[package]]
 name = "polars-io"
-version = "0.36.2"
+version = "0.37.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "7d0458efe8946f4718fd352f230c0db5a37926bd0d2bd25af79dc24746abaaea"
+checksum = "b51fba2cf014cb39c2b38353d601540fb9db643be65abb9ca8ff44b9c4c4a88e"
 dependencies = [
  "ahash 0.8.7",
  "async-trait",
@@ -4092,9 +4103,9 @@ dependencies = [
 
 [[package]]
 name = "polars-json"
-version = "0.36.2"
+version = "0.37.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "ea47d46b7a98fa683ef235ad48b783abf61734828e754096cfbdc77404fff9b3"
+checksum = "973d1f40ba964e70cf0038779056a7850f649538f72d8828c21bc1a7bce312ed"
 dependencies = [
  "ahash 0.8.7",
  "chrono",
@@ -4113,9 +4124,9 @@ dependencies = [
 
 [[package]]
 name = "polars-lazy"
-version = "0.36.2"
+version = "0.37.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "9d7105b40905bb38e8fc4a7fd736594b7491baa12fad3ac492969ca221a1b5d5"
+checksum = "d83343e413346f048f3a5ad07c0ea4b5d0bada701a482878213142970b0ddff8"
 dependencies = [
  "ahash 0.8.7",
  "bitflags 2.4.2",
@@ -4137,15 +4148,19 @@ dependencies = [
 
 [[package]]
 name = "polars-ops"
-version = "0.36.2"
+version = "0.37.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "2e09afc456ab11e75e5dcb43e00a01c71f3a46a2781e450054acb6bb096ca78e"
+checksum = "6395f5fd5e1adf016fd6403c0a493181c1a349a7a145b2687cdf50a0d630310a"
 dependencies = [
  "ahash 0.8.7",
  "argminmax",
+ "base64 0.21.7",
  "bytemuck",
+ "chrono",
+ "chrono-tz",
  "either",
  "hashbrown 0.14.3",
+ "hex",
  "indexmap",
  "memchr",
  "num-traits",
@@ -4160,14 +4175,15 @@ dependencies = [
  "regex",
  "serde",
  "smartstring",
+ "unicode-reverse",
  "version_check",
 ]
 
 [[package]]
 name = "polars-parquet"
-version = "0.36.2"
+version = "0.37.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "7ba24d67b1f64ab85143033dd46fa090b13c0f74acdf91b0780c16aecf005e3d"
+checksum = "b664cac41636cc9f146fba584a8e7c2790d7335a278964529fa3e9b4eae96daf"
 dependencies = [
  "ahash 0.8.7",
  "async-stream",
@@ -4191,9 +4207,9 @@ dependencies = [
 
 [[package]]
 name = "polars-pipe"
-version = "0.36.2"
+version = "0.37.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "d9b7ead073cc3917027d77b59861a9f071db47125de9314f8907db1a0a3e4100"
+checksum = "390a831b864bc57a4cb260b0595030dfb6a4260a3723cf8ca17968ee2078b8ff"
 dependencies = [
  "crossbeam-channel",
  "crossbeam-queue",
@@ -4215,12 +4231,13 @@ dependencies = [
 
 [[package]]
 name = "polars-plan"
-version = "0.36.2"
+version = "0.37.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "384a175624d050c31c473ee11df9d7af5d729ae626375e522158cfb3d150acd0"
+checksum = "7fb7d7527be2aa33baace9000f6772eb9df7cd57ec010a4b273435d2dc1349e8"
 dependencies = [
  "ahash 0.8.7",
  "bytemuck",
+ "chrono-tz",
  "once_cell",
  "percent-encoding",
  "polars-arrow",
@@ -4241,9 +4258,9 @@ dependencies = [
 
 [[package]]
 name = "polars-row"
-version = "0.36.2"
+version = "0.37.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "32322f7acbb83db3e9c7697dc821be73d06238da89c817dcc8bc1549a5e9c72f"
+checksum = "f4984d97aad3d0db92afe76ebcab10b5e37a1216618b5703ae0d2917ccd6168c"
 dependencies = [
  "polars-arrow",
  "polars-error",
@@ -4252,10 +4269,11 @@ dependencies = [
 
 [[package]]
 name = "polars-sql"
-version = "0.36.2"
+version = "0.37.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "9f0b4c6ddffdfd0453e84bc3918572c633014d661d166654399cf93752aa95b5"
+checksum = "77f62a8b8f93146ec1eb2ef340d77eeb174e8010035e449bfdd424d2b1fd944a"
 dependencies = [
+ "hex",
  "polars-arrow",
  "polars-core",
  "polars-error",
@@ -4269,12 +4287,13 @@ dependencies = [
 
 [[package]]
 name = "polars-time"
-version = "0.36.2"
+version = "0.37.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "dee2649fc96bd1b6584e0e4a4b3ca7d22ed3d117a990e63ad438ecb26f7544d0"
+checksum = "6d75348a51d0c97f3b83df860ecb35a6ac6c5dafc6278cac4e1ac101d96dc753"
 dependencies = [
  "atoi",
  "chrono",
+ "chrono-tz",
  "now",
  "once_cell",
  "polars-arrow",
@@ -4289,9 +4308,9 @@ dependencies = [
 
 [[package]]
 name = "polars-utils"
-version = "0.36.2"
+version = "0.37.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "b174ca4a77ad47d7b91a0460aaae65bbf874c8bfbaaa5308675dadef3976bbda"
+checksum = "38f9c955bb1e9b55d835aeb7fe4e4e8826e01abe5f0ada979ceb7d2b9af7b569"
 dependencies = [
  "ahash 0.8.7",
  "bytemuck",
@@ -6073,6 +6092,15 @@ dependencies = [
  "tinyvec",
 ]
 
+[[package]]
+name = "unicode-reverse"
+version = "1.0.8"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "0bea5dacebb0d2d0a69a6700a05b59b3908bf801bf563a49bd27a1b60122962c"
+dependencies = [
+ "unicode-segmentation",
+]
+
 [[package]]
 name = "unicode-segmentation"
 version = "1.10.1"
diff --git a/crates/nu-cmd-dataframe/Cargo.toml b/crates/nu-cmd-dataframe/Cargo.toml
index e46233885a..58623f9e38 100644
--- a/crates/nu-cmd-dataframe/Cargo.toml
+++ b/crates/nu-cmd-dataframe/Cargo.toml
@@ -25,11 +25,11 @@ indexmap = { version = "2.2" }
 num = { version = "0.4", optional = true }
 serde = { version = "1.0", features = ["derive"] }
 sqlparser = { version = "0.43", optional = true }
-polars-io = { version = "0.36", features = ["avro"], optional = true }
-polars-arrow = { version = "0.36", optional = true }
-polars-ops = { version = "0.36", optional = true }
-polars-plan = { version = "0.36", optional = true }
-polars-utils = { version = "0.36", optional = true }
+polars-io = { version = "0.37", features = ["avro"], optional = true }
+polars-arrow = { version = "0.37", optional = true }
+polars-ops = { version = "0.37", optional = true }
+polars-plan = { version = "0.37", features = ["regex"], optional = true }
+polars-utils = { version = "0.37", optional = true }
 
 [dependencies.polars]
 features = [
@@ -63,7 +63,7 @@ features = [
 	"to_dummies",
 ]
 optional = true
-version = "0.36"
+version = "0.37"
 
 [features]
 dataframe = ["num", "polars", "polars-io", "polars-arrow", "polars-ops", "polars-plan", "polars-utils", "sqlparser"]
diff --git a/crates/nu-cmd-dataframe/src/dataframe/eager/open.rs b/crates/nu-cmd-dataframe/src/dataframe/eager/open.rs
index b83013c011..99ef78792f 100644
--- a/crates/nu-cmd-dataframe/src/dataframe/eager/open.rs
+++ b/crates/nu-cmd-dataframe/src/dataframe/eager/open.rs
@@ -154,7 +154,7 @@ fn from_parquet(
             cache: true,
             parallel: ParallelStrategy::Auto,
             rechunk: false,
-            row_count: None,
+            row_index: None,
             low_memory: false,
             cloud_options: None,
             use_statistics: false,
@@ -252,7 +252,7 @@ fn from_ipc(
             n_rows: None,
             cache: true,
             rechunk: false,
-            row_count: None,
+            row_index: None,
             memmap: true,
         };
 
diff --git a/crates/nu-cmd-dataframe/src/dataframe/expressions/concat_str.rs b/crates/nu-cmd-dataframe/src/dataframe/expressions/concat_str.rs
index 0bab26b644..5a80af4855 100644
--- a/crates/nu-cmd-dataframe/src/dataframe/expressions/concat_str.rs
+++ b/crates/nu-cmd-dataframe/src/dataframe/expressions/concat_str.rs
@@ -86,7 +86,7 @@ impl Command for ExprConcatStr {
         let value: Value = call.req(engine_state, stack, 1)?;
 
         let expressions = NuExpression::extract_exprs(value)?;
-        let expr: NuExpression = concat_str(expressions, &separator).into();
+        let expr: NuExpression = concat_str(expressions, &separator, false).into();
 
         Ok(PipelineData::Value(expr.into_value(call.head), None))
     }
diff --git a/crates/nu-cmd-dataframe/src/dataframe/lazy/aggregate.rs b/crates/nu-cmd-dataframe/src/dataframe/lazy/aggregate.rs
index 562fa5de18..bbbe710073 100644
--- a/crates/nu-cmd-dataframe/src/dataframe/lazy/aggregate.rs
+++ b/crates/nu-cmd-dataframe/src/dataframe/lazy/aggregate.rs
@@ -193,7 +193,7 @@ fn get_col_name(expr: &Expr) -> Option<String> {
         | Expr::Window { .. }
         | Expr::Wildcard
         | Expr::RenameAlias { .. }
-        | Expr::Count
+        | Expr::Len
         | Expr::Nth(_)
         | Expr::SubPlan(_, _)
         | Expr::Selector(_) => None,
diff --git a/crates/nu-cmd-dataframe/src/dataframe/series/string/str_slice.rs b/crates/nu-cmd-dataframe/src/dataframe/series/string/str_slice.rs
index 7e7ed2e875..3f71e0ef75 100644
--- a/crates/nu-cmd-dataframe/src/dataframe/series/string/str_slice.rs
+++ b/crates/nu-cmd-dataframe/src/dataframe/series/string/str_slice.rs
@@ -6,7 +6,10 @@ use nu_protocol::{
     engine::{Command, EngineState, Stack},
     Category, Example, PipelineData, ShellError, Signature, Span, SyntaxShape, Type, Value,
 };
-use polars::prelude::{IntoSeries, StringNameSpaceImpl};
+use polars::{
+    prelude::{IntoSeries, NamedFrom, StringNameSpaceImpl},
+    series::Series,
+};
 
 #[derive(Clone)]
 pub struct StrSlice;
@@ -32,25 +35,46 @@ impl Command for StrSlice {
     }
 
     fn examples(&self) -> Vec<Example> {
-        vec![Example {
-            description: "Creates slices from the strings",
-            example: "[abcded abc321 abc123] | dfr into-df | dfr str-slice 1 --length 2",
-            result: Some(
-                NuDataFrame::try_from_columns(
-                    vec![Column::new(
-                        "0".to_string(),
-                        vec![
-                            Value::test_string("bc"),
-                            Value::test_string("bc"),
-                            Value::test_string("bc"),
-                        ],
-                    )],
-                    None,
-                )
-                .expect("simple df for test should not fail")
-                .into_value(Span::test_data()),
-            ),
-        }]
+        vec![
+            Example {
+                description: "Creates slices from the strings",
+                example: "[abcded abc321 abc123] | dfr into-df | dfr str-slice 1 --length 2",
+                result: Some(
+                    NuDataFrame::try_from_columns(
+                        vec![Column::new(
+                            "0".to_string(),
+                            vec![
+                                Value::test_string("bc"),
+                                Value::test_string("bc"),
+                                Value::test_string("bc"),
+                            ],
+                        )],
+                        None,
+                    )
+                    .expect("simple df for test should not fail")
+                    .into_value(Span::test_data()),
+                ),
+            },
+            Example {
+                description: "Creates slices from the strings without length",
+                example: "[abcded abc321 abc123] | dfr into-df | dfr str-slice 1",
+                result: Some(
+                    NuDataFrame::try_from_columns(
+                        vec![Column::new(
+                            "0".to_string(),
+                            vec![
+                                Value::test_string("bcded"),
+                                Value::test_string("bc321"),
+                                Value::test_string("bc123"),
+                            ],
+                        )],
+                        None,
+                    )
+                    .expect("simple df for test should not fail")
+                    .into_value(Span::test_data()),
+                ),
+            },
+        ]
     }
 
     fn run(
@@ -71,9 +95,13 @@ fn command(
     input: PipelineData,
 ) -> Result<PipelineData, ShellError> {
     let start: i64 = call.req(engine_state, stack, 0)?;
+    let start = Series::new("", &[start]);
 
     let length: Option<i64> = call.get_flag(engine_state, stack, "length")?;
-    let length = length.map(|v| v as u64);
+    let length = match length {
+        Some(v) => Series::new("", &[v as u64]),
+        None => Series::new_null("", 1),
+    };
 
     let df = NuDataFrame::try_from_pipeline(input, call.head)?;
     let series = df.as_series(call.head)?;
@@ -86,8 +114,16 @@ fn command(
         inner: vec![],
     })?;
 
-    let mut res = chunked.str_slice(start, length);
-    res.rename(series.name());
+    let res = chunked
+        .str_slice(&start, &length)
+        .map_err(|e| ShellError::GenericError {
+            error: "Dataframe Error".into(),
+            msg: e.to_string(),
+            span: Some(call.head),
+            help: None,
+            inner: vec![],
+        })?
+        .with_name(series.name());
 
     NuDataFrame::try_from_series(vec![res.into_series()], call.head)
         .map(|df| PipelineData::Value(NuDataFrame::into_value(df, call.head), None))
diff --git a/crates/nu-cmd-dataframe/src/dataframe/values/nu_dataframe/conversion.rs b/crates/nu-cmd-dataframe/src/dataframe/values/nu_dataframe/conversion.rs
index fabb26f3a7..1fb12c627e 100644
--- a/crates/nu-cmd-dataframe/src/dataframe/values/nu_dataframe/conversion.rs
+++ b/crates/nu-cmd-dataframe/src/dataframe/values/nu_dataframe/conversion.rs
@@ -1426,7 +1426,7 @@ mod tests {
         let test_int_arr = PrimitiveArray::from([Some(1_i32)]);
         let test_bool_arr = BooleanArray::from([Some(true)]);
         let test_struct_arr = StructArray::new(
-            DataType::Struct(fields.clone()).to_arrow(),
+            DataType::Struct(fields.clone()).to_arrow(true),
             vec![Box::new(test_int_arr), Box::new(test_bool_arr)],
             None,
         );
diff --git a/crates/nu-cmd-dataframe/src/dataframe/values/nu_expression/mod.rs b/crates/nu-cmd-dataframe/src/dataframe/values/nu_expression/mod.rs
index d41aa6b291..3ffb7b7c2b 100644
--- a/crates/nu-cmd-dataframe/src/dataframe/values/nu_expression/mod.rs
+++ b/crates/nu-cmd-dataframe/src/dataframe/values/nu_expression/mod.rs
@@ -252,7 +252,7 @@ pub fn expr_to_value(expr: &Expr, span: Span) -> Result<Value, ShellError> {
                 span,
             ))
         }
-        Expr::Count => Ok(Value::record(
+        Expr::Len => Ok(Value::record(
             record! { "expr" => Value::string("count", span) },
             span,
         )),