I have a requirement to support filtering search results by first letter.
This is relatively simple by adding a field to each index that
represents the first letter for that relevant index and then adding a
filter to the search.
The hard part is that I need to list all the letters you can filter BY.
So if there are no names that start with S, it shouldn't appear as an
option.
Is there a simple and performant way to get a set of all the unique
values for a Field in the Hits returned? There would probably only be
low number of unique values.
So let's say I have the following in my index:
letter, personName
m, mike smith
p, paul smith
g, george smith
g, glenda smith
I need to be able to display to the user that they can filter based on
M, P or G within their search for George.
I could do a compromise and for search results above a certain level,
show all letters and numbers, but it won't always give correct values.
Imagine this edge case: A search for george has 50,000 results, but only
a couple people had george as their last name. Not many of the letters
would be valid filters.
Thanks for any ideas or approaches I overlooked.
Paul Sundling
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