[GitHub] hvanhovell opened a new pull request #23397: [SPARK-26495][SQL] Simplify the SelectedField extractor.

[GitBox <gi...@apache.org>]

hvanhovell opened a new pull request #23397: [SPARK-26495][SQL] Simplify the SelectedField extractor.
URL: https://github.com/apache/spark/pull/23397
 
 
   ## What changes were proposed in this pull request?
   The current `SelectedField` extractor is somewhat complicated and it seems to be handling cases that should be handled automatically:
   
   - `GetArrayItem(child: GetStructFieldObject())`
   - `GetArrayStructFields(child: GetArrayStructFields())`
   - `GetMap(value: GetStructFieldObject())`
   
   This PR removes those cases and simplifies the extractor by passing down the data type instead of a field.
   
   ## How was this patch tested?
   Existing tests.

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