2 files changed, 35 insertions, 3 deletions

diff --git a/database/src/kv/index.rs b/database/src/kv/index.rs
index 5ceab1c..2c96b48 100644
--- a/database/src/kv/index.rs
+++ b/database/src/kv/index.rs
@@ -8,6 +8,7 @@ use crate::{
     MultiBehaviour, RowNum, Sort, SortOrder,
     kv::{
         SubtreeNum,
+        binning::BinningComponent,
         helpers::{read_counter, write_counter},
         index_key::{IndexKey, SortKey},
         prefix_iterator::PrefixIterator,
@@ -17,6 +18,33 @@ use anyhow::{Result, bail};
 use jellyobject::Object;
 use std::{collections::HashSet, iter::empty};
 
+pub fn test_index_identical(ik: &IndexKey, before: &Object, after: &Object) -> bool {
+    let mut identical = true;
+    for b in &ik.0.0 {
+        match b {
+            BinningComponent::Has(path) => {
+                identical &= path.get_matching_value(before).is_some()
+                    == path.get_matching_value(after).is_some();
+            }
+            BinningComponent::Match(path) => {
+                identical &= path.get_matching_values(before) == path.get_matching_values(after);
+            }
+        }
+    }
+    match &ik.1 {
+        SortKey::None | SortKey::Count | SortKey::Random => (),
+        SortKey::Value(path, _) => {
+            identical &= path.get_matching_values(before) == path.get_matching_values(after);
+        }
+        SortKey::Text(paths) => {
+            for p in paths {
+                identical &= p.get_matching_values(before) == p.get_matching_values(after);
+            }
+        }
+    }
+    identical
+}
+
 pub fn update_index(
     txn: &mut dyn jellykv::Transaction,
     is: SubtreeNum,
diff --git a/database/src/kv/mod.rs b/database/src/kv/mod.rs
index f391d31..0ce4683 100644
--- a/database/src/kv/mod.rs
+++ b/database/src/kv/mod.rs
@@ -17,7 +17,7 @@ use crate::{
     Database, Query, RowNum, Transaction,
     kv::{
         helpers::{read_counter, write_counter},
-        index::{iter_index, read_count_index, update_index},
+        index::{iter_index, read_count_index, test_index_identical, update_index},
         index_key::{IndexKey, SortKey},
         merge_iterator::MergeIterator,
         prefix_iterator::PrefixIterator,
@@ -85,12 +85,16 @@ impl Transaction for &mut dyn jellykv::Transaction {
     }
     fn update(&mut self, row: RowNum, entry: Box<Object>) -> Result<()> {
         debug!("update {row}");
+        let after = &entry;
         let before = self.get(row)?.ok_or(anyhow!("row to update missing"))?;
-        jellykv::Transaction::set(*self, &row_key(row), bytemuck::cast_slice(entry.export()))?;
+        jellykv::Transaction::set(*self, &row_key(row), bytemuck::cast_slice(after.export()))?;
 
         for (is, ik) in list_indices(*self)? {
+            if test_index_identical(&ik, &before, &after) {
+                continue;
+            }
             update_index(*self, is, &ik, row, &before, true)?;
-            update_index(*self, is, &ik, row, &entry, false)?;
+            update_index(*self, is, &ik, row, &after, false)?;
         }
 
         Ok(())