improve queries performance

src/main/java/ru/ulstu/extractor/repository/CommitRepository.java

@@ -32,10 +32,10 @@ public interface CommitRepository extends JpaRepository<Commit, Integer> {
     @Query("SELECT new ru.ulstu.extractor.model.CommitTimeStatistic(cast(c.date as date), COUNT(DISTINCT c.hash)) FROM Commit c GROUP by cast(c.date as date) ORDER by cast(c.date as date)")
     List<CommitTimeStatistic> getCommitTimeStatistic();
 
-    @Query("SELECT new ru.ulstu.extractor.model.CommitEntityStatistic(f.containsEntity, COUNT(DISTINCT c.hash)) FROM FileChange f, Commit c WHERE f MEMBER OF c.fileChanges GROUP by f.containsEntity")
+    @Query("SELECT new ru.ulstu.extractor.model.CommitEntityStatistic(f.containsEntity, COUNT(DISTINCT c.hash)) FROM Commit c JOIN c.fileChanges f GROUP by f.containsEntity")
     List<CommitEntityStatistic> getCommitEntityStatistic();
 
-    @Query("SELECT new ru.ulstu.extractor.model.CommitTimeStatistic(cast(c.date as date), COUNT(DISTINCT c.hash)) FROM Commit c, FileChange f WHERE f MEMBER OF c.fileChanges AND f.containsEntity = true GROUP by cast(c.date as date) ORDER by cast(c.date as date)")
+    @Query("SELECT new ru.ulstu.extractor.model.CommitTimeStatistic(cast(c.date as date), COUNT(DISTINCT c.hash)) FROM Commit c JOIN c.fileChanges f WHERE f.containsEntity = true GROUP by cast(c.date as date) ORDER by cast(c.date as date)")
     List<CommitTimeStatistic> getCommitTimeEntityStatistic();
 
 }