Update Delta table URL construction

Author: wi11dey

crates/arroyo-connectors/src/filesystem/sink/delta.rs

@@ -1,5 +1,5 @@
 use super::FinishedFile;
-use anyhow::Result;
+use anyhow::{Result, anyhow};
 use arrow::datatypes::Schema;
 use arroyo_storage::{BackendConfig, R2Config, S3Config, StorageProvider};
 use arroyo_types::to_millis;
@@ -87,7 +87,10 @@ pub(crate) async fn load_or_create_table(
         BackendConfig::Local(_) => (storage_provider.get_backing_store(), "/".to_string()),
     };
 
-    let mut delta = DeltaTableBuilder::from_url(&url)
+    let table_url = Url::parse(&url).or_else(|_| {
+        Url::from_directory_path(&url).map_err(|_| anyhow!("invalid Delta table URL: {url}"))
+    })?;
+    let mut delta = DeltaTableBuilder::from_url(table_url)?
         .with_storage_backend(backing_store, Url::parse(storage_provider.canonical_url())?)
         .build()?;