fix: restore unused code, mark with expect(dead_code)

Signed-off-by: Andrew Lamb <[email protected]>

Author: alamb

crates/core/src/kernel/models/fields.rs

@@ -145,6 +145,19 @@ static REMOVE_FIELD: LazyLock<StructField> = LazyLock::new(|| {
         true,
     )
 });
+// TODO implement support for this checkpoint
+#[expect(dead_code)]
+static REMOVE_FIELD_CHECKPOINT: LazyLock<StructField> = LazyLock::new(|| {
+    StructField::new(
+        "remove",
+        StructType::new(vec![
+            StructField::new("path", DataType::STRING, false),
+            StructField::new("deletionTimestamp", DataType::LONG, true),
+            StructField::new("dataChange", DataType::BOOLEAN, false),
+        ]),
+        true,
+    )
+});
 // https://github.com/delta-io/delta/blob/master/PROTOCOL.md#add-cdc-file
 static CDC_FIELD: LazyLock<StructField> = LazyLock::new(|| {
     StructField::new(

crates/core/src/operations/filesystem_check.rs

@@ -22,7 +22,7 @@ use futures::future::BoxFuture;
 use futures::StreamExt;
 pub use object_store::path::Path;
 use object_store::ObjectStore;
-use serde::{Serialize, Serializer};
+use serde::{de::Error as DeError, Deserialize, Deserializer, Serialize, Serializer};
 use url::{ParseError, Url};
 use uuid::Uuid;
 
@@ -79,6 +79,16 @@ where
     serializer.serialize_str(&json_string)
 }
 
+// Custom deserialization that parses a JSON string into MetricDetails
+#[expect(dead_code)]
+fn deserialize_vec_string<'de, D>(deserializer: D) -> Result<Vec<String>, D::Error>
+where
+    D: Deserializer<'de>,
+{
+    let s: String = Deserialize::deserialize(deserializer)?;
+    serde_json::from_str(&s).map_err(DeError::custom)
+}
+
 fn is_absolute_path(path: &str) -> DeltaResult<bool> {
     match Url::parse(path) {
         Ok(_) => Ok(true),