Liang-Chi Hsieh created SPARK-5907:
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Summary: Selected column from DataFrame should not re-analyze
logical plan
Key: SPARK-5907
URL: https://issues.apache.org/jira/browse/SPARK-5907
Project: Spark
Issue Type: Bug
Components: SQL
Reporter: Liang-Chi Hsieh
Currently, selecting a column from DataFrame wraps the original logical plan
with a Project. As the column is used, the logical plan will be analyzed again.
For some query plan, re-analyzing would side-effect that increases expression
id. So when accessing the column, column's expr and its analyzed plan will
point to different expressions.
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