diff --git a/crates/core-executor/src/duckdb/functions.rs b/crates/core-executor/src/duckdb/functions.rs
index e105c4f99..26e745001 100644
--- a/crates/core-executor/src/duckdb/functions.rs
+++ b/crates/core-executor/src/duckdb/functions.rs
@@ -2,30 +2,76 @@ use crate::error::{self as ex_error, Result as CoreResult};
 use arrow_schema::{DataType, Field, FieldRef};
 use datafusion::arrow::array::Array;
 use datafusion::arrow::record_batch::RecordBatch;
-use datafusion::logical_expr::{ColumnarValue, ScalarFunctionArgs, ScalarUDFImpl};
+use datafusion::logical_expr::{ColumnarValue, ScalarFunctionArgs, TypeSignature};
 use datafusion_common::config::ConfigOptions;
+use datafusion_common::internal_datafusion_err;
+use datafusion_expr::{ScalarUDF, ScalarUDFImpl};
 use duckdb::Connection;
 use duckdb::vscalar::{ArrowFunctionSignature, VArrowScalar};
-use embucket_functions::string_binary::length::LengthFunc;
+use embucket_functions::conditional::{
+    booland, boolor, boolxor, equal_null, iff, nullifzero, zeroifnull,
+};
+use embucket_functions::crypto::md5;
+use embucket_functions::datetime::date_part_extract::Interval;
+use embucket_functions::datetime::{
+    add_months, date_add, date_diff, date_from_parts, date_part_extract, dayname, last_day,
+    monthname, next_day, previous_day, time_from_parts, timestamp_from_parts,
+};
+use embucket_functions::numeric::div0;
+use embucket_functions::regexp::{
+    regexp_instr, regexp_like, regexp_replace, regexp_substr, regexp_substr_all,
+};
+use embucket_functions::string_binary::{
+    hex_decode_binary, hex_decode_string, hex_encode, insert, jarowinkler_similarity as js, length,
+    lower, parse_ip, randstr, replace, rtrimmed_length, sha2, split, strtok, substr,
+};
+use embucket_functions::system::{cancel_query, typeof_func};
 use snafu::ResultExt;
+use std::collections::HashMap;
+use std::fmt::Debug;
+use std::hash::BuildHasher;
 use std::{error::Error, sync::Arc};
-pub struct DfUdfWrapper<T: ScalarUDFImpl> {
-    _inner: T,
+use strum::IntoEnumIterator;
+
+/// Generic adapter between DF and `DuckDB`
+#[derive(Debug, Clone)]
+pub struct DfUdfWrapper<T: ScalarUDFImpl + Default> {
+    _marker: std::marker::PhantomData<T>,
+}
+
+/// Stores a specific `ScalarUDF` instance for `invoke()`
+#[derive(Clone)]
+pub struct UdfState {
+    udf: Arc<ScalarUDF>,
 }
 
-impl<T: ScalarUDFImpl> DfUdfWrapper<T> {
-    pub const fn new(inner: T) -> Self {
-        Self { _inner: inner }
+impl UdfState {
+    #[must_use]
+    pub const fn new(udf: Arc<ScalarUDF>) -> Self {
+        Self { udf }
+    }
+
+    #[must_use]
+    pub fn udf(&self) -> Arc<ScalarUDF> {
+        self.udf.clone()
+    }
+}
+
+impl Default for UdfState {
+    fn default() -> Self {
+        // dummy placeholder (will be overridden by register_with_state)
+        let fake = length::get_udf();
+        Self::new(fake)
     }
 }
 
 impl<T: ScalarUDFImpl + Default> VArrowScalar for DfUdfWrapper<T> {
-    type State = ();
+    type State = UdfState;
 
-    fn invoke(_state: &Self::State, input: RecordBatch) -> Result<Arc<dyn Array>, Box<dyn Error>> {
+    fn invoke(state: &Self::State, input: RecordBatch) -> Result<Arc<dyn Array>, Box<dyn Error>> {
         let num_rows = input.num_rows();
         let schema = input.schema();
-        let func = T::default();
+        let func = state.udf();
         let args: Vec<ColumnarValue> = input
             .columns()
             .iter()
@@ -68,38 +114,177 @@ impl<T: ScalarUDFImpl + Default> VArrowScalar for DfUdfWrapper<T> {
     fn signatures() -> Vec<ArrowFunctionSignature> {
         let func = T::default();
         let sig = func.signature();
+        expand_signature(&func, &sig.type_signature)
+    }
+}
 
-        match &sig.type_signature {
-            datafusion::logical_expr::TypeSignature::Exact(types) => {
-                vec![ArrowFunctionSignature::exact(
-                    types.clone(),
-                    func.return_type(types).unwrap_or(DataType::Utf8),
-                )]
-            }
-            datafusion::logical_expr::TypeSignature::Variadic(valid_types) => {
-                vec![ArrowFunctionSignature::exact(
-                    vec![valid_types.first().cloned().unwrap_or(DataType::Utf8)],
-                    func.return_type(&[valid_types.first().cloned().unwrap_or(DataType::Utf8)])
-                        .unwrap_or(DataType::Utf8),
-                )]
-            }
-            datafusion::logical_expr::TypeSignature::Any(n) => {
-                let args = vec![DataType::Utf8; *n];
-                let ret = func.return_type(&args).unwrap_or(DataType::Utf8);
-                vec![ArrowFunctionSignature::exact(args, ret)]
-            }
-            _ => {
-                let ret = func
-                    .return_type(&[DataType::Utf8])
-                    .unwrap_or(DataType::Utf8);
-                vec![ArrowFunctionSignature::exact(vec![DataType::Utf8], ret)]
-            }
-        }
+pub fn register_all_udfs<S>(
+    conn: &Connection,
+    udfs: &HashMap<String, Arc<ScalarUDF>, S>,
+) -> CoreResult<Vec<String>>
+where
+    S: BuildHasher,
+{
+    let mut failed: Vec<String> = Vec::new();
+
+    // String binary
+    register_duckdb_udf::<hex_decode_binary::HexDecodeBinaryFunc, S>(conn, udfs, &mut failed)?;
+    register_duckdb_udf_try::<hex_decode_binary::HexDecodeBinaryFunc, S>(conn, udfs, &mut failed)?;
+    register_duckdb_udf::<hex_decode_string::HexDecodeStringFunc, S>(conn, udfs, &mut failed)?;
+    register_duckdb_udf_try::<hex_decode_string::HexDecodeStringFunc, S>(conn, udfs, &mut failed)?;
+    register_duckdb_udf::<hex_encode::HexEncodeFunc, S>(conn, udfs, &mut failed)?;
+    register_duckdb_udf::<insert::Insert, S>(conn, udfs, &mut failed)?;
+    register_duckdb_udf::<js::JarowinklerSimilarityFunc, S>(conn, udfs, &mut failed)?;
+    register_duckdb_udf::<length::LengthFunc, S>(conn, udfs, &mut failed)?;
+
+    register_duckdb_udf::<lower::LowerFunc, S>(conn, udfs, &mut failed)?;
+    register_duckdb_udf::<parse_ip::ParseIpFunc, S>(conn, udfs, &mut failed)?;
+    register_duckdb_udf::<randstr::RandStrFunc, S>(conn, udfs, &mut failed)?;
+    register_duckdb_udf::<rtrimmed_length::RTrimmedLengthFunc, S>(conn, udfs, &mut failed)?;
+    register_duckdb_udf::<sha2::Sha2Func, S>(conn, udfs, &mut failed)?;
+    register_duckdb_udf::<split::SplitFunc, S>(conn, udfs, &mut failed)?;
+    register_duckdb_udf::<strtok::StrtokFunc, S>(conn, udfs, &mut failed)?;
+    register_duckdb_udf::<substr::SubstrFunc, S>(conn, udfs, &mut failed)?;
+    register_duckdb_udf::<replace::ReplaceFunc, S>(conn, udfs, &mut failed)?;
+
+    // Regexp
+    register_duckdb_udf::<regexp_instr::RegexpInstrFunc, S>(conn, udfs, &mut failed)?;
+    register_duckdb_udf::<regexp_like::RegexpLikeFunc, S>(conn, udfs, &mut failed)?;
+    register_duckdb_udf::<regexp_replace::RegexpReplaceFunc, S>(conn, udfs, &mut failed)?;
+    register_duckdb_udf::<regexp_substr::RegexpSubstrFunc, S>(conn, udfs, &mut failed)?;
+    register_duckdb_udf::<regexp_substr_all::RegexpSubstrAllFunc, S>(conn, udfs, &mut failed)?;
+
+    // Conditional
+    register_duckdb_udf::<booland::BoolAndFunc, S>(conn, udfs, &mut failed)?;
+    register_duckdb_udf::<boolor::BoolOrFunc, S>(conn, udfs, &mut failed)?;
+    register_duckdb_udf::<boolxor::BoolXorFunc, S>(conn, udfs, &mut failed)?;
+    register_duckdb_udf::<equal_null::EqualNullFunc, S>(conn, udfs, &mut failed)?;
+    register_duckdb_udf::<iff::IffFunc, S>(conn, udfs, &mut failed)?;
+    register_duckdb_udf::<nullifzero::NullIfZeroFunc, S>(conn, udfs, &mut failed)?;
+    register_duckdb_udf::<zeroifnull::ZeroIfNullFunc, S>(conn, udfs, &mut failed)?;
+
+    // Crypto
+    register_duckdb_udf::<md5::Md5Func, S>(conn, udfs, &mut failed)?;
+
+    // Datetime
+    register_duckdb_udf::<add_months::AddMonthsFunc, S>(conn, udfs, &mut failed)?;
+    register_duckdb_udf::<date_add::DateAddFunc, S>(conn, udfs, &mut failed)?;
+    register_duckdb_udf::<date_diff::DateDiffFunc, S>(conn, udfs, &mut failed)?;
+    register_duckdb_udf::<date_from_parts::DateFromPartsFunc, S>(conn, udfs, &mut failed)?;
+    register_duckdb_udf::<dayname::DayNameFunc, S>(conn, udfs, &mut failed)?;
+    register_duckdb_udf::<last_day::LastDayFunc, S>(conn, udfs, &mut failed)?;
+    register_duckdb_udf::<monthname::MonthNameFunc, S>(conn, udfs, &mut failed)?;
+    register_duckdb_udf::<next_day::NextDayFunc, S>(conn, udfs, &mut failed)?;
+    register_duckdb_udf::<previous_day::PreviousDayFunc, S>(conn, udfs, &mut failed)?;
+    register_duckdb_udf::<time_from_parts::TimeFromPartsFunc, S>(conn, udfs, &mut failed)?;
+    register_duckdb_udf::<timestamp_from_parts::TimestampFromPartsFunc, S>(
+        conn,
+        udfs,
+        &mut failed,
+    )?;
+    for interval in Interval::iter() {
+        register_duckdb_udf_internal::<date_part_extract::DatePartExtractFunc, S>(
+            conn,
+            udfs,
+            &interval.to_string(),
+            &mut failed,
+        )?;
     }
+
+    // Numeric
+    register_duckdb_udf_internal::<div0::Div0Func, S>(conn, udfs, "div0null", &mut failed)?;
+    register_duckdb_udf::<div0::Div0Func, S>(conn, udfs, &mut failed)?;
+
+    // System
+    register_duckdb_udf::<cancel_query::SystemCancelQuery, S>(conn, udfs, &mut failed)?;
+    register_duckdb_udf::<typeof_func::SystemTypeofFunc, S>(conn, udfs, &mut failed)?;
+    Ok(failed)
+}
+
+/// Registers a normal (non-try_) UDF in `DuckDB`.
+pub fn register_duckdb_udf<T, S>(
+    conn: &Connection,
+    udfs: &HashMap<String, Arc<ScalarUDF>, S>,
+    failed: &mut Vec<String>,
+) -> CoreResult<()>
+where
+    T: ScalarUDFImpl + Default + 'static,
+    S: BuildHasher,
+{
+    let name = T::default().name().to_string();
+    register_duckdb_udf_internal::<T, S>(conn, udfs, &name, failed)
+}
+
+/// Registers a “try_” variant of a UDF in `DuckDB`.
+pub fn register_duckdb_udf_try<T, S>(
+    conn: &Connection,
+    udfs: &HashMap<String, Arc<ScalarUDF>, S>,
+    failed: &mut Vec<String>,
+) -> CoreResult<()>
+where
+    T: ScalarUDFImpl + Default + 'static,
+    S: BuildHasher,
+{
+    let name = format!("try_{}", T::default().name());
+    register_duckdb_udf_internal::<T, S>(conn, udfs, &name, failed)
 }
 
-pub fn register_all_udfs(conn: &Connection) -> CoreResult<()> {
-    conn.register_scalar_function::<DfUdfWrapper<LengthFunc>>("length_test")
-        .context(ex_error::DuckdbSnafu)?;
+/// Shared internal logic for both normal and try_ function registration.
+fn register_duckdb_udf_internal<T, S>(
+    conn: &Connection,
+    udfs: &HashMap<String, Arc<ScalarUDF>, S>,
+    name: &str,
+    failed: &mut Vec<String>,
+) -> CoreResult<()>
+where
+    T: ScalarUDFImpl + Default + 'static,
+    S: BuildHasher,
+{
+    let func = udfs
+        .get(name)
+        .ok_or_else(|| internal_datafusion_err!("Unable to find expected '{name}' function"))
+        .context(ex_error::DataFusionSnafu)?;
+
+    let state = UdfState::new(func.clone());
+    if conn
+        .register_scalar_function_with_state::<DfUdfWrapper<T>>(name, &state)
+        .is_err()
+    {
+        failed.push(name.to_string());
+    }
     Ok(())
 }
+
+fn expand_signature<T: ScalarUDFImpl>(
+    func: &T,
+    sig: &TypeSignature,
+) -> Vec<ArrowFunctionSignature> {
+    // DataFusion already knows all valid argument type combinations for this signature
+    let example_sigs = match sig {
+        TypeSignature::Any(arg_count) => {
+            let types = vec![DataType::Utf8, DataType::LargeUtf8, DataType::Utf8View];
+            types
+                .into_iter()
+                .map(|dt| vec![dt; *arg_count])
+                .collect::<Vec<_>>()
+        }
+        _ => sig.get_example_types(),
+    };
+
+    if example_sigs.is_empty() {
+        // Fallback when no examples are available (e.g., for generic or nullary signatures)
+        let ret = func
+            .return_type(&[DataType::Utf8])
+            .unwrap_or(DataType::Utf8);
+        return vec![ArrowFunctionSignature::exact(vec![DataType::Utf8], ret)];
+    }
+
+    // Build a DuckDB signature for each valid argument combination
+    example_sigs
+        .into_iter()
+        .map(|types| {
+            let ret = func.return_type(&types).unwrap_or(DataType::Utf8);
+            ArrowFunctionSignature::exact(types, ret)
+        })
+        .collect()
+}
diff --git a/crates/core-executor/src/query.rs b/crates/core-executor/src/query.rs
index ad23bf63b..4d15b1946 100644
--- a/crates/core-executor/src/query.rs
+++ b/crates/core-executor/src/query.rs
@@ -512,7 +512,14 @@ impl UserQuery {
         let sql = self.query.clone();
 
         let conn = Connection::open_in_memory().context(ex_error::DuckdbSnafu)?;
-        register_all_udfs(&conn)?;
+        let failed = register_all_udfs(&conn, self.session.ctx.state().scalar_functions())?;
+        if !failed.is_empty() {
+            tracing::warn!(
+                "Some UDFs were not registered/overloaded in DuckDB: {:?}",
+                failed
+            );
+        }
+
         apply_connection_setup_queries(&conn, &setup_queries)?;
 
         if self.session.config.use_duck_db_explain
diff --git a/crates/embucket-functions/src/datetime/date_part_extract.rs b/crates/embucket-functions/src/datetime/date_part_extract.rs
index ed6d1c8f2..04278964a 100644
--- a/crates/embucket-functions/src/datetime/date_part_extract.rs
+++ b/crates/embucket-functions/src/datetime/date_part_extract.rs
@@ -13,6 +13,7 @@ use datafusion_expr::registry::FunctionRegistry;
 use datafusion_expr::{ScalarFunctionArgs, ScalarUDF, ScalarUDFImpl, Signature, Volatility};
 use snafu::OptionExt;
 use std::any::Any;
+use std::fmt;
 use std::sync::Arc;
 use strum::IntoEnumIterator;
 use strum_macros::EnumIter;
@@ -37,6 +38,30 @@ pub enum Interval {
     Second,
 }
 
+impl fmt::Display for Interval {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        let s = match self {
+            Self::Year => "year",
+            Self::YearOfWeek => "yearofweek",
+            Self::YearOfWeekIso => "yearofweekiso",
+            Self::Day => "day",
+            Self::DayOfMonth => "dayofmonth",
+            Self::DayOfWeek => "dayofweek",
+            Self::DayOfWeekIso => "dayofweekiso",
+            Self::DayOfYear => "dayofyear",
+            Self::Week => "week",
+            Self::WeekOfYear => "weekofyear",
+            Self::WeekIso => "weekiso",
+            Self::Month => "month",
+            Self::Quarter => "quarter",
+            Self::Hour => "hour",
+            Self::Minute => "minute",
+            Self::Second => "second",
+        };
+        write!(f, "{s}")
+    }
+}
+
 /// `YEAR*` / `DAY*` / `WEEK*` / `MONTH` / `QUARTER` / `HOUR` / `MINUTE` / `SECOND` SQL function
 ///
 /// Extracts a specific part of a date or timestamp.
diff --git a/crates/embucket-functions/src/regexp/mod.rs b/crates/embucket-functions/src/regexp/mod.rs
index f3a3ca384..03396d3e3 100644
--- a/crates/embucket-functions/src/regexp/mod.rs
+++ b/crates/embucket-functions/src/regexp/mod.rs
@@ -1,9 +1,9 @@
 pub mod errors;
 pub mod regexp_instr;
-mod regexp_like;
-mod regexp_replace;
-mod regexp_substr;
-mod regexp_substr_all;
+pub mod regexp_like;
+pub mod regexp_replace;
+pub mod regexp_substr;
+pub mod regexp_substr_all;
 
 use crate::regexp::regexp_instr::RegexpInstrFunc;
 use crate::regexp::regexp_like::RegexpLikeFunc;
diff --git a/crates/embucket-functions/src/regexp/regexp_like.rs b/crates/embucket-functions/src/regexp/regexp_like.rs
index 63221191f..88f2407f8 100644
--- a/crates/embucket-functions/src/regexp/regexp_like.rs
+++ b/crates/embucket-functions/src/regexp/regexp_like.rs
@@ -55,6 +55,7 @@ impl Default for RegexpLikeFunc {
 }
 
 impl RegexpLikeFunc {
+    #[must_use]
     pub fn new() -> Self {
         Self {
             signature: Signature::one_of(
diff --git a/crates/embucket-functions/src/regexp/regexp_replace.rs b/crates/embucket-functions/src/regexp/regexp_replace.rs
index 5a54b7870..a9f807d6c 100644
--- a/crates/embucket-functions/src/regexp/regexp_replace.rs
+++ b/crates/embucket-functions/src/regexp/regexp_replace.rs
@@ -59,6 +59,7 @@ impl Default for RegexpReplaceFunc {
 }
 
 impl RegexpReplaceFunc {
+    #[must_use]
     pub fn new() -> Self {
         Self {
             signature: Signature::one_of(
diff --git a/crates/embucket-functions/src/regexp/regexp_substr.rs b/crates/embucket-functions/src/regexp/regexp_substr.rs
index 2c403960c..370b9d8d8 100644
--- a/crates/embucket-functions/src/regexp/regexp_substr.rs
+++ b/crates/embucket-functions/src/regexp/regexp_substr.rs
@@ -65,6 +65,7 @@ impl Default for RegexpSubstrFunc {
 }
 
 impl RegexpSubstrFunc {
+    #[must_use]
     pub fn new() -> Self {
         Self {
             signature: Signature::one_of(
diff --git a/crates/embucket-functions/src/regexp/regexp_substr_all.rs b/crates/embucket-functions/src/regexp/regexp_substr_all.rs
index 8681fbd52..3695ce6bc 100644
--- a/crates/embucket-functions/src/regexp/regexp_substr_all.rs
+++ b/crates/embucket-functions/src/regexp/regexp_substr_all.rs
@@ -67,6 +67,7 @@ impl Default for RegexpSubstrAllFunc {
 }
 
 impl RegexpSubstrAllFunc {
+    #[must_use]
     pub fn new() -> Self {
         Self {
             signature: Signature::one_of(
diff --git a/crates/embucket-functions/src/string-binary/parse_ip.rs b/crates/embucket-functions/src/string-binary/parse_ip.rs
index cb76279c2..ee512648c 100644
--- a/crates/embucket-functions/src/string-binary/parse_ip.rs
+++ b/crates/embucket-functions/src/string-binary/parse_ip.rs
@@ -7,9 +7,7 @@ use datafusion::logical_expr::{
 };
 use datafusion_common::ScalarValue;
 use datafusion_common::cast::as_generic_string_array;
-use datafusion_common::types::{
-    NativeType, logical_float16, logical_float32, logical_float64, logical_string,
-};
+use datafusion_common::types::{NativeType, logical_float32, logical_float64, logical_string};
 use datafusion_expr::{ScalarFunctionArgs, ScalarUDFImpl};
 use ipnet::IpNet;
 use serde_json::json;
@@ -65,7 +63,6 @@ impl ParseIpFunc {
                             TypeSignatureClass::Native(logical_float64()),
                             vec![
                                 TypeSignatureClass::Integer,
-                                TypeSignatureClass::Native(logical_float16()),
                                 TypeSignatureClass::Native(logical_float32()),
                             ],
                             NativeType::Float64,