From 4d71a8f3c2bca0ed51a1b628f8b07d56d032c720 Mon Sep 17 00:00:00 2001
From: Athou <jeremiepanzer@gmail.com>
Date: Thu, 23 Apr 2015 08:55:47 +0200
Subject: [PATCH] rewrite query using not exists

---
 .../com/commafeed/backend/dao/FeedEntryContentDAO.java     | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/src/main/java/com/commafeed/backend/dao/FeedEntryContentDAO.java b/src/main/java/com/commafeed/backend/dao/FeedEntryContentDAO.java
index b0239132..5056e7f5 100644
--- a/src/main/java/com/commafeed/backend/dao/FeedEntryContentDAO.java
+++ b/src/main/java/com/commafeed/backend/dao/FeedEntryContentDAO.java
@@ -11,6 +11,7 @@ import com.commafeed.backend.model.FeedEntryContent;
 import com.commafeed.backend.model.QFeedEntry;
 import com.commafeed.backend.model.QFeedEntryContent;
 import com.google.common.collect.Iterables;
+import com.mysema.query.jpa.hibernate.HibernateSubQuery;
 
 @Singleton
 public class FeedEntryContentDAO extends GenericDAO<FeedEntryContent> {
@@ -30,8 +31,10 @@ public class FeedEntryContentDAO extends GenericDAO<FeedEntryContent> {
 
 	public int deleteWithoutEntries(int max) {
 		QFeedEntry entry = QFeedEntry.feedEntry;
-		List<FeedEntryContent> list = newQuery().from(content).leftJoin(content.entries, entry).where(entry.id.isNull()).limit(max)
-				.list(content);
+
+		HibernateSubQuery subQuery = new HibernateSubQuery().from(entry).where(entry.content.id.eq(content.id));
+		List<FeedEntryContent> list = newQuery().from(content).where(subQuery.notExists()).limit(max).list(content);
+
 		int deleted = list.size();
 		delete(list);
 		return deleted;