element_at [WhereOS, SQL, Spark, Hive]

Class org.apache.spark.sql.catalyst.expressions.ElementAt
Usage element_at(array, index) - Returns element of array at given (1-based) index. If index < 0, accesses elements from the last to the first. Returns NULL if the index exceeds the length of the array. element_at(map, key) - Returns value for given key, or NULL if the key is not contained in the map

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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