How to find the size of an array ?

For reference (it's the 3rd time I mindlessly search the docs):

1. Prepare your array accordingly. (https://knowi.com/docs/cloud9QL.html#ARRAY)
2. C9QL doesn't offer a native array.length or size(array) function, you'll have to convert the array to a string. (https://knowi.com/docs/cloud9QL.html#ARRAY_TO_STRING)
3. Find the length of your array string. (https://knowi.com/docs/cloud9QL.html#LENGTH)