Implement index removal

src/main.rs

@@ -372,12 +372,13 @@ impl Table {
 
     fn delete_row_by_id(&mut self, id: UUID) -> usize {
         if let Some(row) = self.rows.remove(&id) {
+            let mut something_was_deleted = false;
             for (column_position, column_index) in &mut self.indexes {
                 if let DbValue::Indexable(value) = &row[*column_position] {
-                    column_index.remove(value, id)
+                    something_was_deleted = something_was_deleted || column_index.remove(value, id);
                 };
             }
-            1
+            if something_was_deleted { 1 } else { 0 }
         } else {
             0
         }
@@ -522,8 +523,16 @@ impl ColumnIndex {
         }
     }
 
-    fn remove(&mut self, value: &IndexableDbValue, id: UUID) {
-        todo!()
+    fn remove(&mut self, value: &IndexableDbValue, id_to_be_removed: UUID) -> bool {
+        match self.index.get_mut(value) {
+            Some(ids) => {
+                let was_present = ids.remove(&id_to_be_removed);
+                was_present
+            },
+            None => {
+                false
+            }
+        }
     }
 }