concat_array(array x1, array x2, ..) – Returns a concatenated array SELECT array_concat(array(1),array(2,3)); [1,2,3] Platforms: WhereOS,

concat_ws(sep, [str | array(str)]+) – Returns the concatenation of the strings separated by `sep`. Platforms:

conditional_emit(a,b) – Emit features of a row according to various conditions Platforms: WhereOS, Spark, Hive

conv(num, from_base, to_base) – Convert `num` from `from_base` to `to_base`. Platforms: WhereOS, Spark, Hive Class:

combine_sketch(x) – Combine two sketch sets. Platforms: WhereOS, Spark, Hive Class: brickhouse.udf.sketch.CombineSketchUDF More functions can

combine_unique(x) – Returns an array of all distinct elements of all lists in the aggregation