Add an assertion to TransactionReadSet::_record_indexed that all index reads use the same fields (#37278)

GitOrigin-RevId: d3954684eaef86739da6b63afe95e039f005ca4a

Author: goffrie

crates/database/src/reads.rs

@@ -305,19 +305,25 @@ impl TransactionReadSet {
         intervals: impl IntoIterator<Item = Interval>,
     ) -> (usize, usize) {
         self.read_set.indexed.mutate_entry_or_insert_with(
-            index_name,
+            index_name.clone(),
             || IndexReads {
-                fields,
+                fields: fields.clone(),
                 intervals: IntervalSet::new(),
                 stack_traces: (*READ_SET_CAPTURE_BACKTRACES).then_some(vec![]),
             },
             |reads| {
                 let IndexReads {
                     intervals: range_set,
                     stack_traces,
-                    ..
+                    fields: existing_fields,
                 } = reads;
 
+                assert_eq!(
+                    *existing_fields, fields,
+                    "trying to change index fields for index {:?}!",
+                    index_name
+                );
+
                 let range_num_intervals_before = range_set.len();
                 for interval in intervals {
                     if let Some(stack_traces) = stack_traces.as_mut() {