GUACAMOLE-394: Use subquery for querying MAX() via SQL Server.

extensions/guacamole-auth-jdbc/modules/guacamole-auth-jdbc-sqlserver/src/main/resources/org/apache/guacamole/auth/jdbc/connection/ConnectionMapper.xml

@@ -101,15 +101,17 @@
             proxy_encryption_method,
             connection_weight,
             failover_only,
-            MAX(start_date) AS last_active
+            (
+                SELECT MAX(start_date)
+                FROM [guacamole_connection_history]
+                WHERE [guacamole_connection_history].connection_id = [guacamole_connection].connection_id
+            ) AS last_active
         FROM [guacamole_connection]
-        LEFT JOIN [guacamole_connection_history] ON [guacamole_connection_history].connection_id = [guacamole_connection].connection_id
         WHERE [guacamole_connection].connection_id IN
             <foreach collection="identifiers" item="identifier"
                      open="(" separator="," close=")">
                 #{identifier,jdbcType=INTEGER}
-            </foreach>
+            </foreach>;
-        GROUP BY [guacamole_connection].connection_id;
 
         SELECT primary_connection_id, sharing_profile_id
         FROM [guacamole_sharing_profile]
@@ -137,18 +139,20 @@
             proxy_encryption_method,
             connection_weight,
             failover_only,
-            MAX(start_date) AS last_active
+            (
+                SELECT MAX(start_date)
+                FROM [guacamole_connection_history]
+                WHERE [guacamole_connection_history].connection_id = [guacamole_connection].connection_id
+            ) AS last_active
         FROM [guacamole_connection]
         JOIN [guacamole_connection_permission] ON [guacamole_connection_permission].connection_id = [guacamole_connection].connection_id
-        LEFT JOIN [guacamole_connection_history] ON [guacamole_connection_history].connection_id = [guacamole_connection].connection_id
         WHERE [guacamole_connection].connection_id IN
             <foreach collection="identifiers" item="identifier"
                      open="(" separator="," close=")">
                 #{identifier,jdbcType=INTEGER}
             </foreach>
             AND [guacamole_connection_permission].user_id = #{user.objectID,jdbcType=INTEGER}
-            AND permission = 'READ'
+            AND permission = 'READ';
-        GROUP BY [guacamole_connection].connection_id;
 
         SELECT primary_connection_id, [guacamole_sharing_profile].sharing_profile_id
         FROM [guacamole_sharing_profile]
@@ -178,14 +182,16 @@
             proxy_encryption_method,
             connection_weight,
             failover_only,
-            MAX(start_date) AS last_active
+            (
+                SELECT MAX(start_date)
+                FROM [guacamole_connection_history]
+                WHERE [guacamole_connection_history].connection_id = [guacamole_connection].connection_id
+            ) AS last_active
         FROM [guacamole_connection]
-        LEFT JOIN [guacamole_connection_history] ON [guacamole_connection_history].connection_id = [guacamole_connection].connection_id
         WHERE 
             <if test="parentIdentifier != null">parent_id = #{parentIdentifier,jdbcType=INTEGER}</if>
             <if test="parentIdentifier == null">parent_id IS NULL</if>
             AND [guacamole_connection].connection_name = #{name,jdbcType=VARCHAR}
-        GROUP BY [guacamole_connection].connection_id
 
     </select>
 

extensions/guacamole-auth-jdbc/modules/guacamole-auth-jdbc-sqlserver/src/main/resources/org/apache/guacamole/auth/jdbc/user/UserMapper.xml

@@ -80,15 +80,17 @@
             email_address,
             organization,
             organizational_role,
-            MAX(start_date) AS last_active
+            (
+                SELECT MAX(start_date)
+                FROM [guacamole_user_history]
+                WHERE [guacamole_user_history].user_id = [guacamole_user].user_id
+            ) AS last_active
         FROM [guacamole_user]
-        LEFT JOIN [guacamole_user_history] ON [guacamole_user_history].user_id = [guacamole_user].user_id
         WHERE [guacamole_user].username IN
             <foreach collection="identifiers" item="identifier"
                      open="(" separator="," close=")">
                 #{identifier,jdbcType=VARCHAR}
-            </foreach>
+            </foreach>;
-        GROUP BY [guacamole_user].user_id
 
     </select>
 
@@ -112,10 +114,13 @@
             email_address,
             organization,
             organizational_role,
-            MAX(start_date) AS last_active
+            (
+                SELECT MAX(start_date)
+                FROM [guacamole_user_history]
+                WHERE [guacamole_user_history].user_id = [guacamole_user].user_id
+            ) AS last_active
         FROM [guacamole_user]
         JOIN [guacamole_user_permission] ON affected_user_id = [guacamole_user].user_id
-        LEFT JOIN [guacamole_user_history] ON [guacamole_user_history].user_id = [guacamole_user].user_id
         WHERE [guacamole_user].username IN
             <foreach collection="identifiers" item="identifier"
                      open="(" separator="," close=")">
@@ -123,7 +128,6 @@
             </foreach>
             AND [guacamole_user_permission].user_id = #{user.objectID,jdbcType=INTEGER}
             AND permission = 'READ'
-        GROUP BY [guacamole_user].user_id
 
     </select>
 
@@ -147,12 +151,15 @@
             email_address,
             organization,
             organizational_role,
-            MAX(start_date) AS last_active
+            (
+                SELECT MAX(start_date)
+                FROM [guacamole_user_history]
+                WHERE [guacamole_user_history].user_id = [guacamole_user].user_id
+            ) AS last_active
         FROM [guacamole_user]
         LEFT JOIN [guacamole_user_history] ON [guacamole_user_history].user_id = [guacamole_user].user_id
         WHERE
             [guacamole_user].username = #{username,jdbcType=VARCHAR}
-        GROUP BY [guacamole_user].user_id
 
     </select>