perf(query-compiler): skip nested-only update nodes

Signed-off-by: Alexey Orlenko's AI Agent <robot@aqrln.net>
prisma · tensordreams · Jun 12, 2026 · Jun 12, 2026 · Jun 12, 2026 · Jun 24, 2026
commit 23d89d56c15d5aa10a1d99e165f86483578ff9ff
diff --git a/query-compiler/core/src/query_graph_builder/write/nested/update_nested.rs b/query-compiler/core/src/query_graph_builder/write/nested/update_nested.rs
@@ -1,10 +1,11 @@
 use super::*;
-use crate::inputs::{UpdateManyRecordsSelectorsInput, UpdateRecordSelectorsInput};
+use crate::inputs::{ReturnInput, UpdateManyRecordsSelectorsInput, UpdateRecordSelectorsInput};
+use crate::query_graph_builder::write::write_args_parser::WriteArgsParser;
 use crate::query_graph_builder::write::update::UpdateManyRecordNodeOptionals;
 use crate::{DataExpectation, RowSink};
 use crate::{
     ParsedInputValue,
-    query_graph::{NodeRef, QueryGraph, QueryGraphDependency},
+    query_graph::{Flow, NodeRef, QueryGraph, QueryGraphDependency},
 };
 use query_structure::{Filter, Model, RelationFieldRef};
 use schema::constants::args;
@@ -89,8 +90,37 @@ pub fn nested_update(
         let find_child_records_node =
             utils::insert_find_children_by_parent_node(graph, parent, parent_relation_field, filter.clone())?;
 
-        let update_node = update::update_record_node(graph, query_schema, filter, child_model.clone(), data_map, None)?;
         let child_model_identifier = parent_relation_field.related_model().shard_aware_primary_identifier();
+        let update_args = WriteArgsParser::from(child_model, data_map)?;
+
+        if update_args.args.is_empty() && !update_args.nested.is_empty() {
+            let return_node = graph.create_node(Flow::Return(Vec::new()));
+
+            graph.create_edge(
+                &find_child_records_node,
+                &return_node,
+                QueryGraphDependency::ProjectedDataDependency(
+                    child_model_identifier,
+                    RowSink::All(&ReturnInput),
+                    Some(DataExpectation::non_empty_rows(
+                        MissingRelatedRecord::builder()
+                            .model(child_model)
+                            .relation(&parent_relation_field.relation())
+                            .operation(DataOperation::NestedUpdate)
+                            .build(),
+                    )),
+                ),
+            )?;
+
+            for (relation_field, data_map) in update_args.nested {
+                connect_nested_query(graph, query_schema, return_node, relation_field, data_map)?;
+            }
+
+            continue;
+        }
+
+        let update_node =
+            update::update_record_node_from_args(graph, query_schema, filter, child_model.clone(), update_args, None)?;
 
         graph.create_edge(
             &find_child_records_node,

diff --git a/query-compiler/core/src/query_graph_builder/write/update.rs b/query-compiler/core/src/query_graph_builder/write/update.rs
@@ -190,6 +190,21 @@ where
     T: Clone + Into<Filter>,
 {
     let update_args = WriteArgsParser::from(&model, data_map)?;
+
+    update_record_node_from_args(graph, query_schema, filter, model, update_args, field)
+}
+
+pub(crate) fn update_record_node_from_args<T>(
+    graph: &mut QueryGraph,
+    query_schema: &QuerySchema,
+    filter: T,
+    model: Model,
+    update_args: WriteArgsParser<'_>,
+    field: Option<&ParsedField<'_>>,
+) -> QueryGraphBuilderResult<NodeRef>
+where
+    T: Clone + Into<Filter>,
+{
     let mut args = update_args.args;
 
     args.update_datetimes(&model);

diff --git a/.../query-compiler/tests/snapshots/queries__queries@update-set-nested-prisma#27650.json.snap b/.../query-compiler/tests/snapshots/queries__queries@update-set-nested-prisma#27650.json.snap
@@ -20,16 +20,10 @@ transaction
                                 WHERE (1=1 AND "public"."User"."id" IN [$1,*])
                                 OFFSET $2»
                          params [var(0$userId as Int), const(BigInt(0))])
-         in let 1 = unique (validate (get 1)
+         in let 1 = validate (get 1)
                 [ rowCountNeq 0
-                ] orRaise "MISSING_RELATED_RECORD");
-                1$id = mapField id (get 1)
-            in let 2 = unique (query «SELECT "public"."User"."id" FROM
-                                      "public"."User" WHERE (1=1 AND
-                                      "public"."User"."id" IN [$1,*]) LIMIT $2
-                                      OFFSET $3»
-                               params [var(1$id as Int), const(BigInt(1)),
-                                       const(BigInt(0))])
+                ] orRaise "MISSING_RELATED_RECORD"
+            in let 2 = get 1
                in let 2$id = mapField id (get 2)
                   in let 3 = unique (query «SELECT
                                             "public"."NotificationSettings"."userId"