Slight refactoring to make things clearer with DeletedFilter

src/table/util.rs

@@ -0,0 +1,35 @@
+use serde::{Deserialize, Serialize};
+
+use garage_util::data::*;
+
+use crate::schema::*;
+
+#[derive(Clone, PartialEq, Eq, Serialize, Deserialize)]
+pub struct EmptyKey;
+impl SortKey for EmptyKey {
+	fn sort_key(&self) -> &[u8] {
+		&[]
+	}
+}
+impl PartitionKey for EmptyKey {
+	fn hash(&self) -> Hash {
+		[0u8; 32].into()
+	}
+}
+
+#[derive(Clone, Copy, Debug, Serialize, Deserialize)]
+pub enum DeletedFilter {
+	All,
+	Deleted,
+	NotDeleted,
+}
+
+impl DeletedFilter {
+	pub fn apply(&self, deleted: bool) -> bool {
+		match self {
+			DeletedFilter::All => true,
+			DeletedFilter::Deleted => deleted,
+			DeletedFilter::NotDeleted => !deleted,
+		}
+	}
+}