feat(apollo-forest-run): optimize reads for a "preloader pattern"

change/@graphitation-apollo-forest-run-e648b99d-bf21-4b81-a153-70fcf69fafab.json

@@ -0,0 +1,7 @@
+{
+  "type": "minor",
+  "comment": "optimize a \"preloader pattern\" where one operation explicitly covers selection of several other operations",
+  "packageName": "@graphitation/apollo-forest-run",
+  "email": "vrazuvaev@microsoft.com_msteamsmdb",
+  "dependentChangeType": "patch"
+}

packages/apollo-forest-run-benchmark/data/queries/comments-list.graphql

@@ -0,0 +1,37 @@
+query CommentsList($postId: ID!, $first: Int!, $after: String) {
+  ...CommentsListFragment
+}
+
+fragment CommentsListFragment on Query {
+  post(id: $postId) {
+    id
+    comments(first: $first, after: $after) {
+      edges {
+        node {
+          id
+          body
+          createdAt
+          author {
+            id
+            name
+            avatarUrl
+          }
+          reactions {
+            id
+            type
+            user {
+              id
+              name
+            }
+          }
+        }
+        cursor
+      }
+      pageInfo {
+        hasNextPage
+        endCursor
+      }
+      totalCount
+    }
+  }
+}

packages/apollo-forest-run-benchmark/data/queries/post-header.graphql

@@ -0,0 +1,29 @@
+query PostHeader($postId: ID!) {
+  ...PostHeaderFragment
+}
+
+fragment PostHeaderFragment on Query {
+  post(id: $postId) {
+    id
+    title
+    subtitle
+    publishedAt
+    coverImageUrl
+    author {
+      id
+      name
+      avatarUrl
+      bio
+    }
+    tags {
+      id
+      name
+      slug
+    }
+    stats {
+      viewCount
+      likeCount
+      commentCount
+    }
+  }
+}

packages/apollo-forest-run-benchmark/data/queries/post-preloader.graphql

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+query PostPreloader($postId: ID!, $first: Int!, $after: String) @cache(covers: ["CommentsList", "PostHeader"]) {
+  ...PostHeaderFragment
+  ...CommentsListFragment
+}
+
+fragment PostHeaderFragment on Query {
+  post(id: $postId) {
+    id
+    title
+    subtitle
+    publishedAt
+    coverImageUrl
+    author {
+      id
+      name
+      avatarUrl
+      bio
+    }
+    tags {
+      id
+      name
+      slug
+    }
+    stats {
+      viewCount
+      likeCount
+      commentCount
+    }
+  }
+}
+
+fragment CommentsListFragment on Query {
+  post(id: $postId) {
+    id
+    comments(first: $first, after: $after) {
+      edges {
+        node {
+          id
+          body
+          createdAt
+          author {
+            id
+            name
+            avatarUrl
+          }
+          reactions {
+            id
+            type
+            user {
+              id
+              name
+            }
+          }
+        }
+        cursor
+      }
+      pageInfo {
+        hasNextPage
+        endCursor
+      }
+      totalCount
+    }
+  }
+}