From ecf4b707f74298618d019bb8108c25f8fc5ad4c6 Mon Sep 17 00:00:00 2001
From: Vitaly Takmazov
Date: Thu, 20 Dec 2018 00:36:16 +0300
Subject: getMyFeed optimization

---
 .../com/juick/service/MessagesServiceImpl.java     | 40 ++++++++++------------
 1 file changed, 18 insertions(+), 22 deletions(-)

(limited to 'src/main/java/com/juick')

diff --git a/src/main/java/com/juick/service/MessagesServiceImpl.java b/src/main/java/com/juick/service/MessagesServiceImpl.java
index 4e5dca81..9d9a809d 100644
--- a/src/main/java/com/juick/service/MessagesServiceImpl.java
+++ b/src/main/java/com/juick/service/MessagesServiceImpl.java
@@ -577,29 +577,25 @@ public class MessagesServiceImpl extends BaseJdbcService implements MessagesServ
                 .addValue("before", before);
 
         List<Integer> mids = getNamedParameterJdbcTemplate().queryForList(
-                "(SELECT message_id FROM messages " +
-                        " INNER JOIN subscr_users ON (subscr_users.suser_id = :uid AND subscr_users.user_id = messages.user_id) " +
-                        " WHERE " +
-                        (before > 0 ?
-                                " message_id < :before AND " : StringUtils.EMPTY) +
-                        " (privacy >= 0 OR (privacy >= -2 AND privacy <= -1" +
-                        " AND EXISTS (SELECT 1 FROM wl_users w WHERE w.wl_user_id = :uid and w.user_id = messages.user_id))) " +
-                        " AND NOT EXISTS (SELECT 1 FROM bl_tags bt WHERE bt.tag_id IN " +
-                        "(SELECT tag_id FROM messages_tags WHERE message_id = messages.message_id) and :uid = bt.user_id))" +
-                        " UNION " +
-                        " (SELECT message_id FROM messages WHERE user_id=:uid " +
-                        (before > 0 ?
-                                " AND message_id < :before " : StringUtils.EMPTY) +
+                "SELECT message_id FROM messages WHERE " +
+                        "(user_id=:uid OR " +
+                        "(EXISTS (SELECT 1 FROM subscr_users WHERE subscr_users.suser_id = :uid " +
+                        "AND subscr_users.user_id = messages.user_id) " +
+                        "AND NOT EXISTS (SELECT 1 FROM bl_tags bt WHERE bt.tag_id IN " +
+                        "(SELECT tag_id FROM messages_tags WHERE message_id = messages.message_id) AND :uid = bt.user_id) " +
+                        "AND (privacy >= 0 OR (privacy >= -2 AND privacy <= -1 " +
+                        "AND EXISTS (SELECT 1 FROM wl_users w WHERE w.wl_user_id = :uid and w.user_id = messages.user_id)))) " +
                         (recommended ?
-                        ") UNION " +
-                        " (SELECT f.message_id as message_id FROM favorites f INNER JOIN messages ON " +
-                                "f.message_id=messages.message_id WHERE " +
-                        "EXISTS (SELECT 1 FROM subscr_users s WHERE s.suser_id = :uid and f.user_id = s.user_id)" +
-                        (before > 0 ?
-                                " AND f.message_id < :before " : StringUtils.EMPTY)  : StringUtils.EMPTY) +
-                        " AND NOT EXISTS (SELECT 1 FROM bl_users b WHERE b.user_id = :uid and b.bl_user_id = messages.user_id)" +
-                        " AND NOT EXISTS (SELECT 1 FROM bl_tags bt WHERE bt.tag_id IN " +
-                        "(SELECT tag_id FROM messages_tags WHERE message_id = messages.message_id) and :uid = bt.user_id)) " +
+                                "OR (EXISTS (SELECT 1 FROM favorites WHERE favorites.message_id=messages.message_id " +
+                                        "AND favorites.user_id IN (SELECT user_id FROM subscr_users WHERE suser_id=:uid)) " +
+                                        "AND NOT EXISTS (SELECT 1 FROM bl_tags bt WHERE bt.tag_id IN (SELECT tag_id FROM messages_tags " +
+                                        "WHERE message_id = messages.message_id) and :uid = bt.user_id) " +
+                                        "AND (privacy >= 0 OR (privacy >= -2 AND privacy <= -1 " +
+                                        "AND EXISTS (SELECT 1 FROM wl_users w " +
+                                        "WHERE w.wl_user_id = :uid and w.user_id = messages.user_id)))) " +
+                                        "AND NOT EXISTS (SELECT 1 FROM bl_users b WHERE b.user_id = :uid and b.bl_user_id = messages.user_id)" : StringUtils.EMPTY) +
+                        ") " +
+                        (before > 0 ? "AND message_id < :before " : StringUtils.EMPTY) +
                         "ORDER BY message_id DESC LIMIT 20",
                 sqlParameterSource,
                 Integer.class);
-- 
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