An ORDER BY needs to be on the outermost query otherwise subsequent
operations (such as the join) could reorder the tuples.
On Mon, Jul 20, 2015 at 9:25 AM, Carol McDonald <cmcdon...@maprtech.com>
wrote:
> the following query on the Movielens dataset , is sorting by the count of
> ratings for a movie. It looks like the results are ordered by partition
> ?
> scala> val results =sqlContext.sql("select movies.title, movierates.maxr,
> movierates.minr, movierates.cntu from(SELECT ratings.product,
> max(ratings.rating) as maxr, min(ratings.rating) as minr,count(distinct
> user) as cntu FROM ratings group by ratings.product order by cntu desc)
> movierates join movies on movierates.product=movies.movieId ")
>
> scala> results.take(30).foreach(println)
> [Right Stuff, The (1983),5.0,1.0,750]
> [Lost in Space (1998),5.0,1.0,667]
> [Dumb & Dumber (1994),5.0,1.0,660]
> [Patch Adams (1998),5.0,1.0,474]
> [Carlito's Way (1993),5.0,1.0,369]
> [Rounders (1998),5.0,1.0,345]
> [Bedknobs and Broomsticks (1971),5.0,1.0,319]
> [Beverly Hills Ninja (1997),5.0,1.0,232]
> [Saving Grace (2000),5.0,1.0,186]
> [Dangerous Minds (1995),5.0,1.0,141]
> [Death Wish II (1982),5.0,1.0,85]
> [All Dogs Go to Heaven 2 (1996),5.0,1.0,75]
> [Repossessed (1990),4.0,1.0,53]
> [Assignment, The (1997),5.0,1.0,49]
> [$1,000,000 Duck (1971),5.0,1.0,37]
> [Stonewall (1995),5.0,1.0,20]
> [Dog of Flanders, A (1999),5.0,1.0,8]
> [Frogs for Snakes (1998),3.0,1.0,5]
> [It's in the Water (1998),3.0,2.0,3]
> [Twelve Monkeys (1995),5.0,1.0,1511]
> [Ransom (1996),5.0,1.0,564]
> [Alice in Wonderland (1951),5.0,1.0,525]
> [City Slickers II: The Legend of Curly's Gold (1994),5.0,1.0,392]
> [Eat Drink Man Woman (1994),5.0,1.0,346]
> [Cube (1997),5.0,1.0,233]
> [Omega Man, The (1971),5.0,1.0,224]
> [Stepmom (1998),5.0,1.0,146]
> [Metro (1997),5.0,1.0,100]
> [Death Wish 3 (1985),5.0,1.0,72]
> [Stalker (1979),5.0,1.0,52]
>
