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var_pop(expr) – Returns the population variance calculated from values of a group. Platforms: WhereOS, Spark,

uuid() – Returns an universally unique identifier (UUID) string. The value is returned as a

upper(str) – Returns `str` with all characters changed to uppercase. Platforms: WhereOS, Spark, Hive Class:

union_max(x, n) – Returns an map of the union of maps of max N elements

unix_timestamp([timeExp[, format]]) – Returns the UNIX timestamp of current or specified time. Platforms: WhereOS, Spark,

union_vector_sum(x) – Aggregate adding vectors together Platforms: WhereOS, Spark, Hive Class: brickhouse.udf.timeseries.VectorUnionSumUDAF More functions can