statistics and filter with group by didn't work

MySQL 5.7 in Ubuntu 16.04 has ONLY_FULL_GROUP_BY enabled
as default but cqrlog uses group by like it was in previous
versions of MySQL

src/CHANGELOG

@@ -8,6 +8,7 @@ Legend:
   - fixed "TApplication.HandleException TControl.InvalidatePreferredSize loop"
   - frequency memories didn't switch between AM and FM when radio is on USB or LSB - fixed
   - bandmap didn't show CW spots when radio was in CWR mode - fixed
+  - statistics and filter with group by didn't work on MySQL 5.7 - fixed
 
 2.0.0 (2016-04-20)
   + program should work also with MariaDB 10.1

src/dData.pas

@@ -520,6 +520,8 @@ begin
 end;
 
 function TdmData.OpenConnections(host,port,user,pass : String) : Boolean;
+var
+  sql : String;
 begin
   Result := True;
 
@@ -568,6 +570,14 @@ begin
     LogUploadCon.Connected := True;
     BandMapCon.Connected   := True;
     RbnMonCon.Connected    := True;
+
+    sql := 'SET SESSION sql_mode=(SELECT REPLACE(@@sql_mode,'+QuotedStr('ONLY_FULL_GROUP_BY')+','+QuotedStr('')+'));';
+
+    MainCon.ExecuteDirect(sql);
+    dbDXC.ExecuteDirect(sql);
+    LogUploadCon.ExecuteDirect(sql);
+    BandMapCon.ExecuteDirect(sql);
+    RbnMonCon.ExecuteDirect(sql)
   except
     on E : Exception do
     begin