[GitHub] zecevicp opened a new pull request #23737: [SPARK-26826][SQL] Array indexing functions

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zecevicp opened a new pull request #23737: [SPARK-26826][SQL] Array indexing functions
URL: https://github.com/apache/spark/pull/23737
 
 
   ## What changes were proposed in this pull request?
   
   This PR 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.
   
   
   ## How was this patch tested?
   Unit tests
   

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