vortex-data · gatesn · May 9, 2026
diff --git a/vortex-array/public-api.lock b/vortex-array/public-api.lock
@@ -17800,6 +17800,84 @@ pub fn vortex_array::scalar_fn::fns::select::Select::stat_falsification(&self, &
 
 pub fn vortex_array::scalar_fn::fns::select::Select::validity(&self, &Self::Options, &vortex_array::expr::Expression) -> vortex_error::VortexResult<core::option::Option<vortex_array::expr::Expression>>
 
+pub mod vortex_array::scalar_fn::fns::stat
+
+pub struct vortex_array::scalar_fn::fns::stat::StatFn
+
+impl core::clone::Clone for vortex_array::scalar_fn::fns::stat::StatFn
+
+pub fn vortex_array::scalar_fn::fns::stat::StatFn::clone(&self) -> vortex_array::scalar_fn::fns::stat::StatFn
+
+impl vortex_array::scalar_fn::ScalarFnVTable for vortex_array::scalar_fn::fns::stat::StatFn
+
+pub type vortex_array::scalar_fn::fns::stat::StatFn::Options = vortex_array::scalar_fn::fns::stat::StatOptions
+
+pub fn vortex_array::scalar_fn::fns::stat::StatFn::arity(&self, &Self::Options) -> vortex_array::scalar_fn::Arity
+
+pub fn vortex_array::scalar_fn::fns::stat::StatFn::child_name(&self, &Self::Options, usize) -> vortex_array::scalar_fn::ChildName
+
+pub fn vortex_array::scalar_fn::fns::stat::StatFn::coerce_args(&self, &Self::Options, &[vortex_array::dtype::DType]) -> vortex_error::VortexResult<alloc::vec::Vec<vortex_array::dtype::DType>>
+
+pub fn vortex_array::scalar_fn::fns::stat::StatFn::deserialize(&self, &[u8], &vortex_session::VortexSession) -> vortex_error::VortexResult<Self::Options>
+
+pub fn vortex_array::scalar_fn::fns::stat::StatFn::execute(&self, &Self::Options, &dyn vortex_array::scalar_fn::ExecutionArgs, &mut vortex_array::ExecutionCtx) -> vortex_error::VortexResult<vortex_array::ArrayRef>
+
+pub fn vortex_array::scalar_fn::fns::stat::StatFn::fmt_sql(&self, &Self::Options, &vortex_array::expr::Expression, &mut core::fmt::Formatter<'_>) -> core::fmt::Result
+
+pub fn vortex_array::scalar_fn::fns::stat::StatFn::id(&self) -> vortex_array::scalar_fn::ScalarFnId
+
+pub fn vortex_array::scalar_fn::fns::stat::StatFn::is_fallible(&self, &Self::Options) -> bool
+
+pub fn vortex_array::scalar_fn::fns::stat::StatFn::is_null_sensitive(&self, &Self::Options) -> bool
+
+pub fn vortex_array::scalar_fn::fns::stat::StatFn::reduce(&self, &Self::Options, &dyn vortex_array::scalar_fn::ReduceNode, &dyn vortex_array::scalar_fn::ReduceCtx) -> vortex_error::VortexResult<core::option::Option<vortex_array::scalar_fn::ReduceNodeRef>>
+
+pub fn vortex_array::scalar_fn::fns::stat::StatFn::return_dtype(&self, &Self::Options, &[vortex_array::dtype::DType]) -> vortex_error::VortexResult<vortex_array::dtype::DType>
+
+pub fn vortex_array::scalar_fn::fns::stat::StatFn::serialize(&self, &Self::Options) -> vortex_error::VortexResult<core::option::Option<alloc::vec::Vec<u8>>>
+
+pub fn vortex_array::scalar_fn::fns::stat::StatFn::simplify(&self, &Self::Options, &vortex_array::expr::Expression, &dyn vortex_array::scalar_fn::SimplifyCtx) -> vortex_error::VortexResult<core::option::Option<vortex_array::expr::Expression>>
+
+pub fn vortex_array::scalar_fn::fns::stat::StatFn::simplify_untyped(&self, &Self::Options, &vortex_array::expr::Expression) -> vortex_error::VortexResult<core::option::Option<vortex_array::expr::Expression>>
+
+pub fn vortex_array::scalar_fn::fns::stat::StatFn::stat_expression(&self, &Self::Options, &vortex_array::expr::Expression, vortex_array::expr::stats::Stat, &dyn vortex_array::expr::pruning::StatsCatalog) -> core::option::Option<vortex_array::expr::Expression>
+
+pub fn vortex_array::scalar_fn::fns::stat::StatFn::stat_falsification(&self, &Self::Options, &vortex_array::expr::Expression, &dyn vortex_array::expr::pruning::StatsCatalog) -> core::option::Option<vortex_array::expr::Expression>
+
+pub fn vortex_array::scalar_fn::fns::stat::StatFn::validity(&self, &Self::Options, &vortex_array::expr::Expression) -> vortex_error::VortexResult<core::option::Option<vortex_array::expr::Expression>>
+
+pub struct vortex_array::scalar_fn::fns::stat::StatOptions
+
+impl vortex_array::scalar_fn::fns::stat::StatOptions
+
+pub fn vortex_array::scalar_fn::fns::stat::StatOptions::aggregate_fn(&self) -> &vortex_array::aggregate_fn::AggregateFnRef
+
+pub fn vortex_array::scalar_fn::fns::stat::StatOptions::new(vortex_array::aggregate_fn::AggregateFnRef) -> Self
+
+impl core::clone::Clone for vortex_array::scalar_fn::fns::stat::StatOptions
+
+pub fn vortex_array::scalar_fn::fns::stat::StatOptions::clone(&self) -> vortex_array::scalar_fn::fns::stat::StatOptions
+
+impl core::cmp::Eq for vortex_array::scalar_fn::fns::stat::StatOptions
+
+impl core::cmp::PartialEq for vortex_array::scalar_fn::fns::stat::StatOptions
+
+pub fn vortex_array::scalar_fn::fns::stat::StatOptions::eq(&self, &vortex_array::scalar_fn::fns::stat::StatOptions) -> bool
+
+impl core::fmt::Debug for vortex_array::scalar_fn::fns::stat::StatOptions
+
+pub fn vortex_array::scalar_fn::fns::stat::StatOptions::fmt(&self, &mut core::fmt::Formatter<'_>) -> core::fmt::Result
+
+impl core::fmt::Display for vortex_array::scalar_fn::fns::stat::StatOptions
+
+pub fn vortex_array::scalar_fn::fns::stat::StatOptions::fmt(&self, &mut core::fmt::Formatter<'_>) -> core::fmt::Result
+
+impl core::hash::Hash for vortex_array::scalar_fn::fns::stat::StatOptions
+
+pub fn vortex_array::scalar_fn::fns::stat::StatOptions::hash<__H: core::hash::Hasher>(&self, &mut __H)
+
+impl core::marker::StructuralPartialEq for vortex_array::scalar_fn::fns::stat::StatOptions
+
 pub mod vortex_array::scalar_fn::fns::zip
 
 pub struct vortex_array::scalar_fn::fns::zip::Zip
@@ -19066,6 +19144,44 @@ pub fn vortex_array::scalar_fn::fns::select::Select::stat_falsification(&self, &
 
 pub fn vortex_array::scalar_fn::fns::select::Select::validity(&self, &Self::Options, &vortex_array::expr::Expression) -> vortex_error::VortexResult<core::option::Option<vortex_array::expr::Expression>>
 
+impl vortex_array::scalar_fn::ScalarFnVTable for vortex_array::scalar_fn::fns::stat::StatFn
+
+pub type vortex_array::scalar_fn::fns::stat::StatFn::Options = vortex_array::scalar_fn::fns::stat::StatOptions
+
+pub fn vortex_array::scalar_fn::fns::stat::StatFn::arity(&self, &Self::Options) -> vortex_array::scalar_fn::Arity
+
+pub fn vortex_array::scalar_fn::fns::stat::StatFn::child_name(&self, &Self::Options, usize) -> vortex_array::scalar_fn::ChildName
+
+pub fn vortex_array::scalar_fn::fns::stat::StatFn::coerce_args(&self, &Self::Options, &[vortex_array::dtype::DType]) -> vortex_error::VortexResult<alloc::vec::Vec<vortex_array::dtype::DType>>
+
+pub fn vortex_array::scalar_fn::fns::stat::StatFn::deserialize(&self, &[u8], &vortex_session::VortexSession) -> vortex_error::VortexResult<Self::Options>
+
+pub fn vortex_array::scalar_fn::fns::stat::StatFn::execute(&self, &Self::Options, &dyn vortex_array::scalar_fn::ExecutionArgs, &mut vortex_array::ExecutionCtx) -> vortex_error::VortexResult<vortex_array::ArrayRef>
+
+pub fn vortex_array::scalar_fn::fns::stat::StatFn::fmt_sql(&self, &Self::Options, &vortex_array::expr::Expression, &mut core::fmt::Formatter<'_>) -> core::fmt::Result
+
+pub fn vortex_array::scalar_fn::fns::stat::StatFn::id(&self) -> vortex_array::scalar_fn::ScalarFnId
+
+pub fn vortex_array::scalar_fn::fns::stat::StatFn::is_fallible(&self, &Self::Options) -> bool
+
+pub fn vortex_array::scalar_fn::fns::stat::StatFn::is_null_sensitive(&self, &Self::Options) -> bool
+
+pub fn vortex_array::scalar_fn::fns::stat::StatFn::reduce(&self, &Self::Options, &dyn vortex_array::scalar_fn::ReduceNode, &dyn vortex_array::scalar_fn::ReduceCtx) -> vortex_error::VortexResult<core::option::Option<vortex_array::scalar_fn::ReduceNodeRef>>
+
+pub fn vortex_array::scalar_fn::fns::stat::StatFn::return_dtype(&self, &Self::Options, &[vortex_array::dtype::DType]) -> vortex_error::VortexResult<vortex_array::dtype::DType>
+
+pub fn vortex_array::scalar_fn::fns::stat::StatFn::serialize(&self, &Self::Options) -> vortex_error::VortexResult<core::option::Option<alloc::vec::Vec<u8>>>
+
+pub fn vortex_array::scalar_fn::fns::stat::StatFn::simplify(&self, &Self::Options, &vortex_array::expr::Expression, &dyn vortex_array::scalar_fn::SimplifyCtx) -> vortex_error::VortexResult<core::option::Option<vortex_array::expr::Expression>>
+
+pub fn vortex_array::scalar_fn::fns::stat::StatFn::simplify_untyped(&self, &Self::Options, &vortex_array::expr::Expression) -> vortex_error::VortexResult<core::option::Option<vortex_array::expr::Expression>>
+
+pub fn vortex_array::scalar_fn::fns::stat::StatFn::stat_expression(&self, &Self::Options, &vortex_array::expr::Expression, vortex_array::expr::stats::Stat, &dyn vortex_array::expr::pruning::StatsCatalog) -> core::option::Option<vortex_array::expr::Expression>
+
+pub fn vortex_array::scalar_fn::fns::stat::StatFn::stat_falsification(&self, &Self::Options, &vortex_array::expr::Expression, &dyn vortex_array::expr::pruning::StatsCatalog) -> core::option::Option<vortex_array::expr::Expression>
+
+pub fn vortex_array::scalar_fn::fns::stat::StatFn::validity(&self, &Self::Options, &vortex_array::expr::Expression) -> vortex_error::VortexResult<core::option::Option<vortex_array::expr::Expression>>
+
 impl vortex_array::scalar_fn::ScalarFnVTable for vortex_array::scalar_fn::fns::zip::Zip
 
 pub type vortex_array::scalar_fn::fns::zip::Zip::Options = vortex_array::scalar_fn::EmptyOptions
@@ -19450,6 +19566,86 @@ pub type vortex_array::session::ArrayRegistry = vortex_session::registry::Regist
 
 pub mod vortex_array::stats
 
+pub mod vortex_array::stats::expr
+
+pub struct vortex_array::stats::expr::StatFn
+
+impl core::clone::Clone for vortex_array::scalar_fn::fns::stat::StatFn
+
+pub fn vortex_array::scalar_fn::fns::stat::StatFn::clone(&self) -> vortex_array::scalar_fn::fns::stat::StatFn
+
+impl vortex_array::scalar_fn::ScalarFnVTable for vortex_array::scalar_fn::fns::stat::StatFn
+
+pub type vortex_array::scalar_fn::fns::stat::StatFn::Options = vortex_array::scalar_fn::fns::stat::StatOptions
+
+pub fn vortex_array::scalar_fn::fns::stat::StatFn::arity(&self, &Self::Options) -> vortex_array::scalar_fn::Arity
+
+pub fn vortex_array::scalar_fn::fns::stat::StatFn::child_name(&self, &Self::Options, usize) -> vortex_array::scalar_fn::ChildName
+
+pub fn vortex_array::scalar_fn::fns::stat::StatFn::coerce_args(&self, &Self::Options, &[vortex_array::dtype::DType]) -> vortex_error::VortexResult<alloc::vec::Vec<vortex_array::dtype::DType>>
+
+pub fn vortex_array::scalar_fn::fns::stat::StatFn::deserialize(&self, &[u8], &vortex_session::VortexSession) -> vortex_error::VortexResult<Self::Options>
+
+pub fn vortex_array::scalar_fn::fns::stat::StatFn::execute(&self, &Self::Options, &dyn vortex_array::scalar_fn::ExecutionArgs, &mut vortex_array::ExecutionCtx) -> vortex_error::VortexResult<vortex_array::ArrayRef>
+
+pub fn vortex_array::scalar_fn::fns::stat::StatFn::fmt_sql(&self, &Self::Options, &vortex_array::expr::Expression, &mut core::fmt::Formatter<'_>) -> core::fmt::Result
+
+pub fn vortex_array::scalar_fn::fns::stat::StatFn::id(&self) -> vortex_array::scalar_fn::ScalarFnId
+
+pub fn vortex_array::scalar_fn::fns::stat::StatFn::is_fallible(&self, &Self::Options) -> bool
+
+pub fn vortex_array::scalar_fn::fns::stat::StatFn::is_null_sensitive(&self, &Self::Options) -> bool
+
+pub fn vortex_array::scalar_fn::fns::stat::StatFn::reduce(&self, &Self::Options, &dyn vortex_array::scalar_fn::ReduceNode, &dyn vortex_array::scalar_fn::ReduceCtx) -> vortex_error::VortexResult<core::option::Option<vortex_array::scalar_fn::ReduceNodeRef>>
+
+pub fn vortex_array::scalar_fn::fns::stat::StatFn::return_dtype(&self, &Self::Options, &[vortex_array::dtype::DType]) -> vortex_error::VortexResult<vortex_array::dtype::DType>
+
+pub fn vortex_array::scalar_fn::fns::stat::StatFn::serialize(&self, &Self::Options) -> vortex_error::VortexResult<core::option::Option<alloc::vec::Vec<u8>>>
+
+pub fn vortex_array::scalar_fn::fns::stat::StatFn::simplify(&self, &Self::Options, &vortex_array::expr::Expression, &dyn vortex_array::scalar_fn::SimplifyCtx) -> vortex_error::VortexResult<core::option::Option<vortex_array::expr::Expression>>
+
+pub fn vortex_array::scalar_fn::fns::stat::StatFn::simplify_untyped(&self, &Self::Options, &vortex_array::expr::Expression) -> vortex_error::VortexResult<core::option::Option<vortex_array::expr::Expression>>
+
+pub fn vortex_array::scalar_fn::fns::stat::StatFn::stat_expression(&self, &Self::Options, &vortex_array::expr::Expression, vortex_array::expr::stats::Stat, &dyn vortex_array::expr::pruning::StatsCatalog) -> core::option::Option<vortex_array::expr::Expression>
+
+pub fn vortex_array::scalar_fn::fns::stat::StatFn::stat_falsification(&self, &Self::Options, &vortex_array::expr::Expression, &dyn vortex_array::expr::pruning::StatsCatalog) -> core::option::Option<vortex_array::expr::Expression>
+
+pub fn vortex_array::scalar_fn::fns::stat::StatFn::validity(&self, &Self::Options, &vortex_array::expr::Expression) -> vortex_error::VortexResult<core::option::Option<vortex_array::expr::Expression>>
+
+pub struct vortex_array::stats::expr::StatOptions
+
+impl vortex_array::scalar_fn::fns::stat::StatOptions
+
+pub fn vortex_array::scalar_fn::fns::stat::StatOptions::aggregate_fn(&self) -> &vortex_array::aggregate_fn::AggregateFnRef
+
+pub fn vortex_array::scalar_fn::fns::stat::StatOptions::new(vortex_array::aggregate_fn::AggregateFnRef) -> Self
+
+impl core::clone::Clone for vortex_array::scalar_fn::fns::stat::StatOptions
+
+pub fn vortex_array::scalar_fn::fns::stat::StatOptions::clone(&self) -> vortex_array::scalar_fn::fns::stat::StatOptions
+
+impl core::cmp::Eq for vortex_array::scalar_fn::fns::stat::StatOptions
+
+impl core::cmp::PartialEq for vortex_array::scalar_fn::fns::stat::StatOptions
+
+pub fn vortex_array::scalar_fn::fns::stat::StatOptions::eq(&self, &vortex_array::scalar_fn::fns::stat::StatOptions) -> bool
+
+impl core::fmt::Debug for vortex_array::scalar_fn::fns::stat::StatOptions
+
+pub fn vortex_array::scalar_fn::fns::stat::StatOptions::fmt(&self, &mut core::fmt::Formatter<'_>) -> core::fmt::Result
+
+impl core::fmt::Display for vortex_array::scalar_fn::fns::stat::StatOptions
+
+pub fn vortex_array::scalar_fn::fns::stat::StatOptions::fmt(&self, &mut core::fmt::Formatter<'_>) -> core::fmt::Result
+
+impl core::hash::Hash for vortex_array::scalar_fn::fns::stat::StatOptions
+
+pub fn vortex_array::scalar_fn::fns::stat::StatOptions::hash<__H: core::hash::Hasher>(&self, &mut __H)
+
+impl core::marker::StructuralPartialEq for vortex_array::scalar_fn::fns::stat::StatOptions
+
+pub fn vortex_array::stats::expr::stat(vortex_array::expr::Expression, vortex_array::aggregate_fn::AggregateFnRef) -> vortex_array::expr::Expression
+
 pub mod vortex_array::stats::flatbuffers
 
 pub struct vortex_array::stats::ArrayStats
@@ -19682,6 +19878,8 @@ pub const vortex_array::stats::PRUNING_STATS: &[vortex_array::expr::stats::Stat]
 
 pub fn vortex_array::stats::as_stat_bitset_bytes(&[vortex_array::expr::stats::Stat]) -> alloc::vec::Vec<u8>
 
+pub fn vortex_array::stats::stat(vortex_array::expr::Expression, vortex_array::aggregate_fn::AggregateFnRef) -> vortex_array::expr::Expression
+
 pub fn vortex_array::stats::stats_from_bitset_bytes(&[u8]) -> alloc::vec::Vec<vortex_array::expr::stats::Stat>
 
 pub type vortex_array::stats::StatsArray = [(vortex_array::expr::stats::Stat, vortex_array::expr::stats::Precision<vortex_array::scalar::ScalarValue>); 4]

diff --git a/vortex-array/src/scalar_fn/fns/mod.rs b/vortex-array/src/scalar_fn/fns/mod.rs
@@ -20,4 +20,5 @@ pub mod operators;
 pub mod pack;
 pub mod root;
 pub mod select;
+pub mod stat;
 pub mod zip;
diff --git a/vortex-array/src/scalar_fn/fns/stat.rs b/vortex-array/src/scalar_fn/fns/stat.rs
@@ -0,0 +1,141 @@
+// SPDX-License-Identifier: Apache-2.0
+// SPDX-FileCopyrightText: Copyright the Vortex contributors
+
+//! Scalar function implementation for aggregate-backed stat expressions.
+
+use std::fmt::Display;
+use std::fmt::Formatter;
+
+use vortex_error::VortexResult;
+use vortex_error::vortex_bail;
+
+use crate::ArrayRef;
+use crate::ExecutionCtx;
+use crate::IntoArray;
+use crate::aggregate_fn::AggregateFnRef;
+use crate::arrays::Chunked;
+use crate::arrays::ChunkedArray;
+use crate::arrays::ConstantArray;
+use crate::arrays::chunked::ChunkedArrayExt;
+use crate::dtype::DType;
+use crate::expr::Expression;
+use crate::expr::stats::StatsProvider;
+use crate::scalar::Scalar;
+use crate::scalar_fn::Arity;
+use crate::scalar_fn::ChildName;
+use crate::scalar_fn::ExecutionArgs;
+use crate::scalar_fn::ScalarFnId;
+use crate::scalar_fn::ScalarFnVTable;
+use crate::stats::legacy::legacy_stat_for_aggregate;
+
+/// Options for the `stat` scalar function.
+#[derive(Clone, Debug, PartialEq, Eq, Hash)]
+pub struct StatOptions {
+    aggregate_fn: AggregateFnRef,
+}
+
+impl StatOptions {
+    /// Creates options for the provided aggregate statistic.
+    pub fn new(aggregate_fn: AggregateFnRef) -> Self {
+        Self { aggregate_fn }
+    }
+
+    /// Returns the aggregate function backing this statistic lookup.
+    pub fn aggregate_fn(&self) -> &AggregateFnRef {
+        &self.aggregate_fn
+    }
+}
+
+impl Display for StatOptions {
+    fn fmt(&self, f: &mut Formatter<'_>) -> std::fmt::Result {
+        Display::fmt(&self.aggregate_fn, f)
+    }
+}
+
+/// Scalar function that evaluates stored aggregate statistics.
+#[derive(Clone)]
+pub struct StatFn;
+
+impl ScalarFnVTable for StatFn {
+    type Options = StatOptions;
+
+    fn id(&self) -> ScalarFnId {
+        ScalarFnId::new("vortex.stat")
+    }
+
+    fn arity(&self, _options: &Self::Options) -> Arity {
+        Arity::Exact(1)
+    }
+
+    fn child_name(&self, _options: &Self::Options, child_idx: usize) -> ChildName {
+        match child_idx {
+            0 => ChildName::from("input"),
+            _ => unreachable!("Invalid child index {} for Stat expression", child_idx),
+        }
+    }
+
+    fn fmt_sql(
+        &self,
+        options: &Self::Options,
+        expr: &Expression,
+        f: &mut Formatter<'_>,
+    ) -> std::fmt::Result {
+        write!(f, "stat(")?;
+        expr.child(0).fmt_sql(f)?;
+        write!(f, ", {})", options.aggregate_fn())
+    }
+
+    fn return_dtype(&self, options: &Self::Options, arg_dtypes: &[DType]) -> VortexResult<DType> {
+        stat_dtype(options.aggregate_fn(), &arg_dtypes[0])
+    }
+
+    fn execute(
+        &self,
+        options: &Self::Options,
+        args: &dyn ExecutionArgs,
+        _ctx: &mut ExecutionCtx,
+    ) -> VortexResult<ArrayRef> {
+        let input = args.get(0)?;
+        let dtype = stat_dtype(options.aggregate_fn(), input.dtype())?;
+
+        if let Some(chunked) = input.as_opt::<Chunked>() {
+            let chunks = chunked
+                .iter_chunks()
+                .map(|chunk| stat_array(chunk, options.aggregate_fn(), dtype.clone(), chunk.len()))
+                .collect::<VortexResult<Vec<_>>>()?;
+            return Ok(ChunkedArray::try_new(chunks, dtype)?.into_array());
+        }
+
+        stat_array(&input, options.aggregate_fn(), dtype, args.row_count())
+    }
+}
+
+fn stat_dtype(aggregate_fn: &AggregateFnRef, input_dtype: &DType) -> VortexResult<DType> {
+    let Some(dtype) = aggregate_fn.return_dtype(input_dtype) else {
+        vortex_bail!(
+            "Aggregate function {} does not support input dtype {}",
+            aggregate_fn,
+            input_dtype
+        );
+    };
+    Ok(dtype.as_nullable())
+}
+
+fn stat_array(
+    array: &ArrayRef,
+    aggregate_fn: &AggregateFnRef,
+    dtype: DType,
+    len: usize,
+) -> VortexResult<ArrayRef> {
+    let value = legacy_stat_for_aggregate(aggregate_fn)
+        .and_then(|stat| {
+            array
+                .statistics()
+                .with_typed_stats_set(|stats| stats.get(stat))
+        })
+        .and_then(|stat| stat.as_exact())
+        .and_then(Scalar::into_value);
+
+    let scalar = Scalar::try_new(dtype, value)?;
+    Ok(ConstantArray::new(scalar, len).into_array())
+}
diff --git a/vortex-array/src/scalar_fn/session.rs b/vortex-array/src/scalar_fn/session.rs
@@ -26,6 +26,7 @@ use crate::scalar_fn::fns::not::Not;
 use crate::scalar_fn::fns::pack::Pack;
 use crate::scalar_fn::fns::root::Root;
 use crate::scalar_fn::fns::select::Select;
+use crate::scalar_fn::fns::stat::StatFn;
 
 /// Registry of scalar function vtables.
 pub type ScalarFnRegistry = Registry<ScalarFnPluginRef>;
@@ -70,6 +71,7 @@ impl Default for ScalarFnSession {
         this.register(Pack);
         this.register(Root);
         this.register(Select);
+        this.register(StatFn);
 
         this
     }