The only way I could see doing it with one query is to generate the file at the same time as the table-plus. Usually this isn't a desirable course of action as it takes extra time to make the file, time which slows the http response. Unless the query is significantly longer to execute than the time to build the pdf, I'd stick with the 2 query version you have. Alternatively, you could implement some sort of temporary cache (like memcache) using the query parameters to store the results.
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