Fix/speedup for scheduling scope (#10341)

* LATERAL to reduce calculated descendants

The descendants are calculated to know when to stop calculating successors as they are (transitively) scheduled manually.

* linting

app/models/work_packages/scopes/for_scheduling.rb

@@ -119,7 +119,7 @@ module WorkPackages::Scopes
       def paths_sql(work_packages)
         values = work_packages.map { |wp| "(#{wp.id}, false)" }.join(', ')
 
-        <<~SQL
+        <<~SQL.squish
           to_schedule (id, manually) AS (
             SELECT * FROM (VALUES#{values}) AS t(id, manually)
 
@@ -131,7 +131,7 @@ module WorkPackages::Scopes
                 THEN relations.from_id
                 ELSE relations.to_id
               END id,
-                 (work_packages.schedule_manually OR COALESCE(descendants.schedule_manually, false)) manually
+              (related_work_packages.schedule_manually OR COALESCE(descendants.schedule_manually, false)) manually
             FROM
               to_schedule
             JOIN
@@ -141,13 +141,13 @@ module WorkPackages::Scopes
               AND
                 ((relations.to_id = to_schedule.id)
                 OR (relations.from_id = to_schedule.id AND relations.follows = 0))
-               LEFT JOIN work_packages
+            LEFT JOIN work_packages related_work_packages
               ON (CASE
                 WHEN relations.to_id = to_schedule.id
                 THEN relations.from_id
                 ELSE relations.to_id
-                   END) = work_packages.id
-               LEFT JOIN (
+                END) = related_work_packages.id
+            LEFT JOIN LATERAL (
               SELECT
                 relations.from_id,
                 bool_and(COALESCE(work_packages.schedule_manually, false)) schedule_manually
@@ -155,15 +155,16 @@ module WorkPackages::Scopes
               JOIN work_packages
               ON
                 work_packages.id = relations.to_id
+                AND related_work_packages.id = relations.from_id
                 AND relations.follows = 0 AND #{relations_condition_sql(transitive: true)}
               GROUP BY relations.from_id
-          ) descendants ON work_packages.id = descendants.from_id
+            ) descendants ON related_work_packages.id = descendants.from_id
           )
         SQL
       end
 
       def relations_condition_sql(transitive: false)
-        <<~SQL
+        <<~SQL.squish
           "relations"."relates" = 0 AND "relations"."duplicates" = 0 AND "relations"."blocks" = 0 AND "relations"."includes" = 0 AND "relations"."requires" = 0
             AND (relations.hierarchy + relations.relates + relations.duplicates + relations.follows + relations.blocks + relations.includes + relations.requires #{transitive ? '>' : ''}= 1)
         SQL