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[SPARK-10389] [SQL] support order by non-attribute grouping expressio…
…n on Aggregate For example, we can write `SELECT MAX(value) FROM src GROUP BY key + 1 ORDER BY key + 1` in PostgreSQL, and we should support this in Spark SQL. Author: Wenchen Fan <cloud0fan@outlook.com> Closes #8548 from cloud-fan/support-order-by-non-attribute.
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