Pie chart visualization not working

I am trying to view data about some bookings.

I want to get pie chart visual of the data where each slice of pie tells about number of bookings done under different plans.

Look at the error sign in the top left corner. It says, **this.datapoints[a][1] is undefined
**

What is the error ?

looks like your query is not including a date histogram, think the pie chart panel only works with time series

So, is there any kind of progress being made in the pie chart plugin to make this thing work ?

I mean this is kind of a general requirement .

Is there any issue open for this feature ?