Merge pull request #1519 from bharath2020/fix/load-records-performance-issue

Improve loadRecords performance in SQLiteNormalizedCache

Author: designatednerd

Sources/ApolloSQLite/SQLiteNormalizedCache.swift

@@ -140,11 +140,12 @@ extension SQLiteNormalizedCache: NormalizedCache {
     let result: Swift.Result<[Record?], Error>
     do {
       let records = try self.selectRecords(forKeys: keys)
+      let recordsIndexMap = records.indices.reduce(into: [:]) { resultMap, index in
+        resultMap[records[index].key] = index
+      }
+
       let recordsOrNil: [Record?] = keys.map { key in
-        if let recordIndex = records.firstIndex(where: { $0.key == key }) {
-          return records[recordIndex]
-        }
-        return nil
+        recordsIndexMap[key].flatMap { records[$0] }
       }
 
       result = .success(recordsOrNil)