[jira] [Created] (SPARK-26826) Array indexing functions array_allpositions and array_select

["Petar Zecevic (JIRA)" <ji...@apache.org>]

Petar Zecevic created SPARK-26826:
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             Summary: Array indexing functions array_allpositions and array_select
                 Key: SPARK-26826
                 URL: https://issues.apache.org/jira/browse/SPARK-26826
             Project: Spark
          Issue Type: New Feature
          Components: SQL
    Affects Versions: 2.4.0
            Reporter: Petar Zecevic


This ticket proposes two extra array functions: `array_allpositions` (named after `array_position`) and `array_select`. These functions should make it easier to:
* get an array of indices of all occurences of a value in an array (`array_allpositions`)
* select all elements of an array based on an array of indices (`array_select`)

Although higher-order functions, such as `aggregate` and `transform`, have been recently added, performing tasks above is still not simple, hence this addition.



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