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## What changes were proposed in this pull request? Column.expr is private[sql], but it's an actually really useful field to have for debugging. We should open it up, similar to how we use QueryExecution. ## How was this patch tested? N/A - this is a simple visibility change. Author: Reynold Xin <rxin@databricks.com> Closes #15724 from rxin/SPARK-18216. |
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