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recall_at(array rankItems, array correctItems [, const int recommendSize = rankItems.size]) – Returns Recall Platforms: WhereOS,

reflect(class, method[, arg1[, arg2 ..]]) – Calls a method with reflection. Platforms: WhereOS, Spark, Hive

regexp_extract(str, regexp[, idx]) – Extracts a group that matches `regexp`. Platforms: WhereOS, Spark, Hive Class:

rand_amplify(const int xtimes [, const string options], *) – amplify the input records x-times in

randn([seed]) – Returns a random value with independent and identically distributed (i.i.d.) values drawn from

rank() – Computes the rank of a value in a group of values. The result