[branch-53] fix: foreign inner ffi types (#21439) (#21524)

- Part of #21079
- Closes #21155 on branch-53

This PR:
- Backports #21439 from
@timsaucer to the branch-53 line

Co-authored-by: Tim Saucer <timsaucer@gmail.com>

Author: alamb

datafusion/ffi/src/catalog_provider.rs

@@ -250,6 +250,11 @@ impl FFI_CatalogProvider {
         runtime: Option<Handle>,
         logical_codec: FFI_LogicalExtensionCodec,
     ) -> Self {
+        if let Some(provider) = provider.as_any().downcast_ref::<ForeignCatalogProvider>()
+        {
+            return provider.0.clone();
+        }
+
         let private_data = Box::new(ProviderPrivateData { provider, runtime });
 
         Self {

datafusion/ffi/src/schema_provider.rs

@@ -259,6 +259,11 @@ impl FFI_SchemaProvider {
         runtime: Option<Handle>,
         logical_codec: FFI_LogicalExtensionCodec,
     ) -> Self {
+        if let Some(provider) = provider.as_any().downcast_ref::<ForeignSchemaProvider>()
+        {
+            return provider.0.clone();
+        }
+
         let owner_name = provider.owner_name().map(|s| s.into()).into();
         let private_data = Box::new(ProviderPrivateData { provider, runtime });
 

datafusion/ffi/src/table_provider.rs

@@ -391,6 +391,9 @@ impl FFI_TableProvider {
         runtime: Option<Handle>,
         logical_codec: FFI_LogicalExtensionCodec,
     ) -> Self {
+        if let Some(provider) = provider.as_any().downcast_ref::<ForeignTableProvider>() {
+            return provider.0.clone();
+        }
         let private_data = Box::new(ProviderPrivateData { provider, runtime });
 
         Self {