vtab::Free is no longer needed

BindInfo and InitInfo will be dropped in the usual way when freed by duckdb core. Any necessary destructors can be in Drop impls.

crates/duckdb/examples/hello-ext/main.rs

@@ -6,7 +6,7 @@ extern crate libduckdb_sys;
 
 use duckdb::{
     core::{DataChunkHandle, Inserter, LogicalTypeHandle, LogicalTypeId},
-    vtab::{BindInfo, Free, FunctionInfo, InitInfo, VTab},
+    vtab::{BindInfo, FunctionInfo, InitInfo, VTab},
     Connection, Result,
 };
 use duckdb_loadable_macros::duckdb_entrypoint;
@@ -20,16 +20,12 @@ struct HelloBindData {
     name: String,
 }
 
-impl Free for HelloBindData {}
-
 struct HelloInitData {
     done: bool,
 }
 
 struct HelloVTab;
 
-impl Free for HelloInitData {}
-
 impl VTab for HelloVTab {
     type InitData = HelloInitData;
     type BindData = HelloBindData;

crates/duckdb/src/vtab/mod.rs

@@ -34,23 +34,15 @@ unsafe extern "C" fn drop_boxed<T>(v: *mut c_void) {
     drop(unsafe { Box::from_raw(v.cast::<T>()) });
 }
 
-/// Free trait for the bind and init data
-pub trait Free {
-    /// Free the data
-    fn free(&mut self) {}
-}
-
 /// Duckdb table function trait
 ///
 /// See to the HelloVTab example for more details
 /// <https://duckdb.org/docs/api/c/table_functions>
 pub trait VTab: Sized {
     /// The data type of the bind data
-    type InitData: Sized + Free;
+    type InitData: Sized;
     /// The data type of the init data
-    type BindData: Sized + Free; // TODO: and maybe Send + Sync as this might be called from multiple threads?
-
-    // TODO: Get rid of Free, just use Drop?
+    type BindData: Sized; // TODO: and maybe Send + Sync as this might be called from multiple threads?
 
     /// Bind data to the table function
     fn bind(bind: &BindInfo) -> Result<Self::BindData, Box<dyn std::error::Error>>;
@@ -186,16 +178,12 @@ mod test {
         name: String,
     }
 
-    impl Free for HelloBindData {}
-
     struct HelloInitData {
         done: bool,
     }
 
     struct HelloVTab;
 
-    impl Free for HelloInitData {}
-
     impl VTab for HelloVTab {
         type InitData = HelloInitData;
         type BindData = HelloBindData;