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https://issues.apache.org/jira/browse/SPARK-12725?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15122016#comment-15122016
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Michael Armbrust commented on SPARK-12725:
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Why don't we just add a flag to AttributeReference to say if its generated? We
have wanted that in the past anyway since generated attributes should not be
resolvable.
> SQL generation suffers from name conficts introduced by some analysis rules
> ---------------------------------------------------------------------------
>
> Key: SPARK-12725
> URL: https://issues.apache.org/jira/browse/SPARK-12725
> Project: Spark
> Issue Type: Sub-task
> Components: SQL
> Reporter: Cheng Lian
>
> Some analysis rules generate auxiliary attribute references with the same
> name but different expression IDs. For example, {{ResolveAggregateFunctions}}
> introduces {{havingCondition}} and {{aggOrder}}, and
> {{DistinctAggregationRewriter}} introduces {{gid}}.
> This is OK for normal query execution since these attribute references get
> expression IDs. However, it's troublesome when converting resolved query
> plans back to SQL query strings since expression IDs are erased.
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