Avoid compute/store another fp on content if uuid is already the key.

src/base/schema.rs

@@ -359,7 +359,7 @@ impl std::fmt::Display for FieldSchema {
 pub struct CollectorSchema {
     pub fields: Vec<FieldSchema>,
     /// If specified, the collector will have an automatically generated UUID field with the given index.
-    pub auto_uuid_field_idx: Option<usize>,
+    pub auto_uuid_field_idx: Option<u32>,
 }
 
 impl std::fmt::Display for CollectorSchema {

src/builder/analyzer.rs

@@ -971,6 +971,12 @@ impl AnalyzerContext<'_> {
             })
             .transpose()?;
 
+        let value_stable = collector_schema
+            .auto_uuid_field_idx
+            .map(|uuid_idx| match &primary_key_def {
+                AnalyzedPrimaryKeyDef::Fields(fields) => fields.contains(&uuid_idx),
+            })
+            .unwrap_or(false);
         Ok(async move {
             trace!("Start building executor for export op `{}`", export_op.name);
             let (executor, query_target) = executor_fut
@@ -990,6 +996,7 @@ impl AnalyzerContext<'_> {
                 primary_key_def,
                 primary_key_type,
                 value_fields: value_fields_idx,
+                value_stable,
             })
         })
     }

src/builder/plan.rs

@@ -109,6 +109,9 @@ pub struct AnalyzedExportOp {
     pub primary_key_type: ValueType,
     /// idx for value fields - excluding the primary key field.
     pub value_fields: Vec<u32>,
+    /// If true, value is never changed on the same primary key.
+    /// This is guaranteed if the primary key contains auto-generated UUIDs.
+    pub value_stable: bool,
 }
 
 pub enum AnalyzedReactiveOp {

src/execution/indexer.rs

@@ -226,17 +226,20 @@ async fn precommit_source_tracking_info(
                         .fields
                         .push(value.fields[*field as usize].clone());
                 }
-                let curr_fp = Some(
-                    Fingerprinter::default()
-                        .with(&field_values)?
-                        .into_fingerprint(),
-                );
-
                 let existing_target_keys = target_info.existing_keys_info.remove(&primary_key_json);
                 let existing_staging_target_keys = target_info
                     .existing_staging_keys_info
                     .remove(&primary_key_json);
 
+                let curr_fp = if !export_op.value_stable {
+                    Some(
+                        Fingerprinter::default()
+                            .with(&field_values)?
+                            .into_fingerprint(),
+                    )
+                } else {
+                    None
+                };
                 if existing_target_keys
                     .as_ref()
                     .map(|keys| !keys.is_empty() && keys.iter().all(|(_, fp)| fp == &curr_fp))