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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