count(*) – Returns the total number of retrieved rows, including rows containing null. count(expr[, expr…]) – Returns the number of rows for which the supplied expression(s) are all non-null. count(DISTINCT expr[, expr…]) – Returns the number of rows for which the supplied expression(s) are unique and non-null.
Platforms: WhereOS, Spark, Hive
Class: org.apache.spark.sql.catalyst.expressions.aggregate.Count
More functions can be added to WhereOS via Python or R bindings or as Java & Scala UDF (user-defined function), UDAF (user-defined aggregation function) and UDTF (user-defined table generating function) extensions. Custom libraries can be added on via Settings-page or installed from WhereOS Store.
