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

union_sketch(x) – Constructs a sketch set to estimate reach for large values by collecting multiple

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

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

unhex(expr) – Converts hexadecimal `expr` to binary. Platforms: WhereOS, Spark, Hive Class: org.apache.spark.sql.catalyst.expressions.Unhex More functions

union_hyperloglog(x) – Merges multiple hyperloglogs together. Platforms: WhereOS, Spark, Hive Class: brickhouse.udf.hll.UnionHyperLogLogUDAF More functions can