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Posted to issues@spark.apache.org by "Apache Spark (JIRA)" <ji...@apache.org> on 2019/04/25 16:56:02 UTC
[jira] [Assigned] (SPARK-27297) Add higher order functions to Scala
API
[ https://issues.apache.org/jira/browse/SPARK-27297?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Apache Spark reassigned SPARK-27297:
------------------------------------
Assignee: Apache Spark
> Add higher order functions to Scala API
> ---------------------------------------
>
> Key: SPARK-27297
> URL: https://issues.apache.org/jira/browse/SPARK-27297
> Project: Spark
> Issue Type: Improvement
> Components: SQL
> Affects Versions: 3.0.0
> Reporter: Nikolas Vanderhoof
> Assignee: Apache Spark
> Priority: Major
>
> There is currently no existing Scala API equivalent for the higher order functions introduced in Spark 2.4.0.
> * transform
> * aggregate
> * filter
> * exists
> * zip_with
> * map_zip_with
> * map_filter
> * transform_values
> * transform_keys
> Equivalent column based functions should be added to the Scala API for org.apache.spark.sql.functions with the following signatures:
>
> {code:scala}
> def transform(column: Column, f: Column => Column): Column = ???
> def transform(column: Column, f: (Column, Column) => Column): Column = ???
> def exists(column: Column, f: Column => Column): Column = ???
> def filter(column: Column, f: Column => Column): Column = ???
> def aggregate(
> expr: Column,
> zero: Column,
> merge: (Column, Column) => Column,
> finish: Column => Column): Column = ???
> def aggregate(
> expr: Column,
> zero: Column,
> merge: (Column, Column) => Column): Column = ???
> def zip_with(
> left: Column,
> right: Column,
> f: (Column, Column) => Column): Column = ???
> def transform_keys(expr: Column, f: (Column, Column) => Column): Column = ???
> def transform_values(expr: Column, f: (Column, Column) => Column): Column = ???
> def map_filter(expr: Column, f: (Column, Column) => Column): Column = ???
> def map_zip_with(left: Column, right: Column, f: (Column, Column, Column) => Column): Column = ???
> {code}
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