Allow "sort" keyword in constraint subquery for "Add from Freebase"

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When adding a columns from Freebase, it's possible to specify a limit, but not 
a sort order, making the selection of which items you'll get random.

As a real-world example, I was recently asked to get the most recent population 
figures for a list of countries, as long as it was within the last 5 years. I 
could use something like:

{"limit":1,
"sort":"-year",
"year<":"2012",
"year>=":"2006"
}

except that the "sort" keyword is filtered out by Refine

Original issue reported on code.google.com by tfmorris on 9 Dec 2011 at 10:29

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Added in r2403

Original comment by tfmorris on 9 Dec 2011 at 10:38

• Changed state: Fixed

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Original comment by dfhu...@google.com on 11 Dec 2011 at 10:33

• Added labels: Milestone-2.5