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Posted to reviews@spark.apache.org by GitBox <gi...@apache.org> on 2019/05/14 10:09:29 UTC

[GitHub] [spark] viirya opened a new pull request #24599: [SPARK-27701][SQL] Extend NestedColumnAliasing to more nested field cases

viirya opened a new pull request #24599: [SPARK-27701][SQL] Extend NestedColumnAliasing to more nested field cases
URL: https://github.com/apache/spark/pull/24599
 
 
   ## What changes were proposed in this pull request?
   
   `NestedColumnAliasing` rule covers `GetStructField` only, currently. It means that some nested field extraction expressions aren't pruned. For example, if only accessing a nested field in an array of struct, this column isn't pruned. This patch extends the rule to cover such cases.
   
   ## How was this patch tested?
   
   Added tests.

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