query hint should be part of the PackagePredicate

Author: tayloraswift

Sources/UnidocQueries/Packages/Unidoc.PackageCreated.swift

@@ -19,7 +19,7 @@ extension Unidoc
         @usableFromInline
         let limit:Int
 
-        @inlinable internal
+        @inlinable
         init(during timeframe:Range<UnixDate>, limit:Int)
         {
             self.timeframe = timeframe
@@ -29,6 +29,9 @@ extension Unidoc
 }
 extension Unidoc.PackageCreated:Unidoc.PackagePredicate
 {
+    @inlinable public
+    var hint:Mongo.CollectionIndex? { Unidoc.DB.Packages.indexRepoCreated }
+
     public
     func extend(pipeline:inout Mongo.PipelineEncoder)
     {

Sources/UnidocQueries/Packages/Unidoc.PackagePredicate.swift

@@ -1,4 +1,5 @@
 import MongoQL
+import UnidocDB
 
 extension Unidoc
 {
@@ -11,4 +12,6 @@ public
 protocol _UnidocPackagePredicate:Equatable, Hashable, Sendable
 {
     func extend(pipeline:inout Mongo.PipelineEncoder)
+
+    var hint:Mongo.CollectionIndex? { get }
 }

Sources/UnidocQueries/Packages/Unidoc.PackagesQuery.swift

@@ -35,8 +35,8 @@ extension Unidoc.PackagesQuery:Mongo.PipelineQuery
     public
     typealias Iteration = Mongo.SingleBatch<Unidoc.PackageOutput>
 
-    public
-    var hint:Mongo.CollectionIndex? { Unidoc.DB.Packages.indexRepoCreated }
+    @inlinable public
+    var hint:Mongo.CollectionIndex? { self.package.hint }
 
     public
     func build(pipeline:inout Mongo.PipelineEncoder)