Added perftest for ColumnsHashing.

dbms/tests/performance/columns_hashing/columns_hashing.xml

+<test>
+    <name>Benchmark</name>
+
+    <tags>
+        <tag>columns_hashing</tag>
+    </tags>
+
+    <preconditions>
+        <table_exists>hits_100m_single</table_exists>
+        <table_exists>hits_1000m_single</table_exists>
+    </preconditions>
+
+    <type>loop</type>
+
+    <stop_conditions>
+        <all_of>
+            <iterations>5</iterations>
+            <min_time_not_changing_for_ms>60000</min_time_not_changing_for_ms>
+        </all_of>
+        <any_of>
+            <iterations>10</iterations>
+            <total_time_ms>150000</total_time_ms>
+        </any_of>
+    </stop_conditions>
+
+<!--
+    <query><![CDATA[select count() from hits_100m_single any left join  hits_100m_single using (UserID, RegionID)]]></query>
+    <query><![CDATA[select count() from hits_100m_single any left join  hits_100m_single using (UserID)]]></query>
+    <query><![CDATA[select count() from hits_100m_single any left join  hits_100m_single using URL where URL != '']]></query>
+    <query><![CDATA[select count() from hits_1000m_single any left join  hits_1000m_single using MobilePhoneModel where MobilePhoneModel != '']]></query>
+    <query><![CDATA[select count() from hits_100m_single any left join  hits_100m_single using (MobilePhoneModel, UserID) where MobilePhoneModel != '']]></query>
+
+    <query><![CDATA[select count() from (select count() from hits_1000m_single group by (UserID))]]></query>
+    <query><![CDATA[select count() from (select count() from hits_100m_single group by (UserID, RegionID))]]></query>
+    <query><![CDATA[select count() from (select count() from hits_100m_single where URL != '' group by URL)]]></query>
+    <query><![CDATA[select count() from (select count() from hits_1000m_single where MobilePhoneModel != '' group by MobilePhoneModel)]]></query>
+    <query><![CDATA[select count() from (select count() from hits_1000m_single  where MobilePhoneModel != '' group by (MobilePhoneModel, UserID))]]></query>
+-->
+    <query><![CDATA[select sum(UserID + 1 in (select UserID from hits_100m_single)) from hits_100m_single]]></query>
+    <query><![CDATA[select sum((UserID + 1, RegionID) in (select UserID, RegionID from hits_100m_single)) from hits_100m_single]]></query>
+    <query><![CDATA[select sum(URL in (select URL from hits_100m where URL != '')) from hits_100m_single]]></query>
+    <query><![CDATA[select sum(MobilePhoneModel in (select MobilePhoneModel from hits_1000m where MobilePhoneModel != '')) from hits_1000m_single]]></query>
+    <query><![CDATA[select sum((MobilePhoneModel, UserID + 1) in (select MobilePhoneModel, UserID from hits_1000m where MobilePhoneModel != '')) from hits_1000m_single]]></query>
+
+    <main_metric>
+        <min_time/>
+    </main_metric>
+</test>