Liang-Chi Hsieh created SPARK-14354:
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Summary: Let Expand take name expressions and infer output
attributes
Key: SPARK-14354
URL: https://issues.apache.org/jira/browse/SPARK-14354
Project: Spark
Issue Type: Improvement
Components: SQL
Reporter: Liang-Chi Hsieh
Currently we create Expand operator by specifying projections
(Seq[Seq[Expression]]) and its output. We allow Expand to reuse child
operator's attributes and so make its contraints invalid. We should let it take
name expressions and infer output itself.
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