cardinality(expr) – Returns the size of an array or a map.The function returns -1 if its input is null and spark.sql.legacy.sizeOfNull is set to true.If spark.sql.legacy.sizeOfNull is set to false, the function returns null for null input.By default, the spark.sql.legacy.sizeOfNull parameter is set to true.
Platforms: WhereOS, Spark, Hive
Class: org.apache.spark.sql.catalyst.expressions.Size
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.
