Reynold Xin created SPARK-18215:
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Summary: Make Column.expr public
Key: SPARK-18215
URL: https://issues.apache.org/jira/browse/SPARK-18215
Project: Spark
Issue Type: Improvement
Components: SQL
Reporter: Reynold Xin
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.
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