Hi Ravi,
I'm afraid my former comment was not clear enough.
What I meant was:
yes, I know there is visualizing query plan functionality, which worked on revision 47.
Now we are using revision 52. Visualize Plan shows simple diagram having two boxes.
Now choose "execute" from the context menu, then nothing happens but the same boxes remains (i.e. it doesn't work!)
Hope I explained well.
TiA.
Regards,
Satoshi