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first_value

first_value(expr[, isIgnoreNull]) – Returns the first value of `expr` for a group of rows. If `isIgnoreNull` is true, returns only non-null values.

Platforms: WhereOS, Spark, Hive

Class: org.apache.spark.sql.catalyst.expressions.aggregate.First

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.

View the complete guide of WhereOS functions.

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first_value

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