Modify spanner query to get Feature Keys for each data point [Missing one implementation]

[jcscottiii]

For the missing one implementation chart, we only show the count per timestamp. It would be great to include the feature keys (and maybe names as metadata)

You will want to try things out in Spanner Studio in GCP.

Some options to try:

1. Modify the spanner query to return an additional column where it is an array of the data we want.
2. Modify the spanner query to not do the aggregation count in spanner but to return the array and we do the counting client side.