Document Clone bound

Author: mlafeldt

crates/duckdb/src/vscalar/function.rs

@@ -131,7 +131,6 @@ impl ScalarFunction {
     ///
     /// # Arguments
     /// * `info`: The extra information to store
-    /// ```
     pub fn set_extra_info<T>(&self, info: T) -> &Self
     where
         T: Send + Sync + 'static,

crates/duckdb/src/vscalar/mod.rs

@@ -151,6 +151,8 @@ impl Connection {
     }
 
     /// Register the given ScalarFunction with custom state.
+    ///
+    /// The state is cloned once per function signature (overload) and stored in DuckDB's catalog.
     #[inline]
     pub fn register_scalar_function_with_state<S: VScalar>(&self, name: &str, state: &S::State) -> crate::Result<()>
     where

crates/duckdb/src/vtab/mod.rs

@@ -155,6 +155,8 @@ impl Connection {
     ///
     /// This allows you to pass extra info that can be accessed during bind, init, and execution
     /// via `BindInfo::get_extra_info`, `InitInfo::get_extra_info`, or `TableFunctionInfo::get_extra_info`.
+    ///
+    /// The extra info is cloned once during registration and stored in DuckDB's catalog.
     #[inline]
     pub fn register_table_function_with_extra_info<T: VTab, E>(&self, name: &str, extra_info: &E) -> Result<()>
     where