count

count [WhereOS, SQL, Spark, Hive]

Class org.apache.spark.sql.catalyst.expressions.aggregate.Count
Usage 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.

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.

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