Upgrade delta_kernel to 0.9 (spiceai#5343)

* Upgrade delta_kernel to 0.7

* Upgrade to delta_kernel 0.9

Author: phillipleblanc

Cargo.lock

@@ -29,9 +29,10 @@ datafusion-federation = { workspace = true }
 datafusion-federation-sql = { workspace = true }
 datafusion-table-providers = { workspace = true }
 db_connection_pool = { path = "../db_connection_pool" }
-delta_kernel = { version = "0.6.1", features = [
+delta_kernel = { version = "0.9", features = [
     "default-engine",
     "cloud",
+    "arrow_54",
 ], optional = true }
 document_parse = { path = "../document_parse" }
 duckdb = { workspace = true, features = [

crates/data_components/Cargo.toml

@@ -37,6 +37,7 @@ use datafusion::physical_plan::metrics::ExecutionPlanMetricsSet;
 use datafusion::physical_plan::{ExecutionPlan, PhysicalExpr};
 use datafusion::scalar::ScalarValue;
 use datafusion::sql::TableReference;
+use delta_kernel::ExpressionRef;
 use delta_kernel::Table;
 use delta_kernel::engine::default::DefaultEngine;
 use delta_kernel::engine::default::executor::tokio::TokioBackgroundExecutor;
@@ -144,13 +145,13 @@ impl DeltaTable {
             .map_err(handle_delta_error)?;
 
         let arrow_schema = Self::get_schema(&snapshot);
-        let delta_schema = snapshot.schema().clone();
+        let delta_schema = snapshot.schema();
 
         Ok(Self {
             table,
             engine,
             arrow_schema: Arc::new(arrow_schema),
-            delta_schema: Arc::new(delta_schema),
+            delta_schema,
         })
     }
 
@@ -359,18 +360,14 @@ impl TableProvider for DeltaTable {
                 let mut scan_context = ScanContext::new(scan_state, Arc::clone(&engine));
 
                 let scan_iter = scan
-                    .scan_data(engine.as_ref())
+                    .scan_metadata(engine.as_ref())
                     .map_err(map_delta_error_to_datafusion_err)?;
 
                 for scan_result in scan_iter {
-                    let data = scan_result.map_err(map_delta_error_to_datafusion_err)?;
-                    scan_context = delta_kernel::scan::state::visit_scan_files(
-                        data.0.as_ref(),
-                        data.1.as_ref(),
-                        scan_context,
-                        handle_scan_file,
-                    )
-                    .map_err(map_delta_error_to_datafusion_err)?;
+                    let scan = scan_result.map_err(map_delta_error_to_datafusion_err)?;
+                    scan_context = scan
+                        .visit_scan_files(scan_context, handle_scan_file)
+                        .map_err(map_delta_error_to_datafusion_err)?;
                 }
 
                 Ok::<_, datafusion::error::DataFusionError>((
@@ -546,6 +543,16 @@ struct PartitionFileContext {
     partitioned_file: PartitionedFile,
     selection_vector: Option<Vec<bool>>,
     partition_values: HashMap<String, String>,
+
+    /// These are transforms that Delta wants to apply to the physical data read from the Parquet files.
+    /// Currently this is only used for adding partition columns and mapping the columns read from the Parquet files
+    /// into the correct place in the output schema.
+    ///
+    /// Both of these functions are already handled for us by the `DataFusion` `ParquetExec`. However, we may need to
+    /// revisit this if more complex transformations are required.
+    ///
+    /// See: <https://github.com/delta-io/delta-kernel-rs/blob/7e62d12def00f248eccef23e7672fd4db553274f/kernel/src/scan/mod.rs#L444>
+    _transform: Option<ExpressionRef>,
 }
 
 #[allow(clippy::needless_pass_by_value)]
@@ -557,6 +564,7 @@ fn handle_scan_file(
     size: i64,
     _stats: Option<Stats>,
     dv_info: DvInfo,
+    transform: Option<ExpressionRef>,
     partition_values: HashMap<String, String>,
 ) {
     let root_url = match Url::parse(&scan_context.scan_state.table_root) {
@@ -619,6 +627,7 @@ fn handle_scan_file(
         partitioned_file,
         selection_vector,
         partition_values,
+        _transform: transform,
     });
 }