Assuming my URL_Query field contains the following data:
How can I display a table containing a unique count of value pairs cdata?
... | extract auto=true | stats count by cdata
Actually, unless you've done something to turn it off, the fields will usually have been auto extracted by Splunk without you having to call the extract command.
I also found this answer:
However, I don't have the value pairs pre-parsed. I need to do it during the search.