CODEWITHSUNDEEP
scalaapache-sparkapache-spark-sql
Iman
Iman

Reputation: 25

How to get this output in spark sql?

How do I get this output of listing all the movies for each year using spark.sql?

Ouput:
(1988,{(Rain Man),(Die Hard)})
(1990,{(The Godfather: Part III),(Die Hard 2),(The Silence of the Lambs),(King of New York)})
(1992,{(Unforgiven),(Bad Lieutenant),(Reservoir Dogs)})
(1994,{(Pulp Fiction)})

this is the json data:

{ "id": "movie:1", "title": "Vertigo", "year": 1958, "genre": "Drama", "summary": "A retired San Francisco detective suffering from acrophobia investigates the strange activities of an old friend's wife, all the while becoming dangerously obsessed with her.", "country": "USA", "director": { "id": "artist:3", "last_name": "Hitchcock", "first_name": "Alfred", "year_of_birth": "1899" }, "actors": [ { "id": "artist:15", "role": "John Ferguson" }, { "id": "artist:16", "role": "Madeleine Elster" } ] }

Here is the code I have tried:

val hiveCtx = new org.apache.spark.sql.hive.HiveContext(sc) 
val movies = hiveCtx.jsonFile("movies.json") 
movies.createOrReplaceTempView("movies")
val ty = hiveCtx.sql("SELECT year, title FROM movies")

Please help me find the correct query.

Thanks for you help.

Upvotes: 0

Views: 525

Answers (1)

Jonathan Myers
Jonathan Myers

Reputation: 930

You can get something similar without using spark.sql. You can simply perform the operation on the dataframe itself:

movies.groupBy($"year").agg(concat_ws("; ", collect_list($"title"))).show

Dataset used:

{ "id": "movie:1", "title": "Vertigo", "year": 1958, "genre": "Drama", "summary": "A retired San Francisco detective suffering from acrophobia investigates the strange activities of an old friend's wife, all the while becoming dangerously obsessed with her.", "country": "USA", "director": { "id": "artist:3", "last_name": "Hitchcock", "first_name": "Alfred", "year_of_birth": "1899" }, "actors": [ { "id": "artist:15", "role": "John Ferguson" }, { "id": "artist:16", "role": "Madeleine Elster" } ] }
{ "id": "movie:2", "title": "The Blob", "year": 1958, "genre": "Drama", "summary": "The Blob", "country": "USA", "director": { "id": "artist:3", "last_name": "Hitchcock", "first_name": "Alfred", "year_of_birth": "1899" }, "actors": [ { "id": "artist:15", "role": "John Ferguson" }, { "id": "artist:16", "role": "Madeleine Elster" } ] }

Output:

+----+----------------------------------+
|year|concat_ws(; , collect_list(title))|
+----+----------------------------------+
|1958|                 Vertigo; The Blob|
+----+----------------------------------+

Upvotes: 1

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