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https://issues.apache.org/jira/browse/SPARK-16621?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15383726#comment-15383726
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Apache Spark commented on SPARK-16621:
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User 'dongjoon-hyun' has created a pull request for this issue:
https://github.com/apache/spark/pull/14257
> Use a stable ID generation method for attributes in SQLBuilder
> --------------------------------------------------------------
>
> Key: SPARK-16621
> URL: https://issues.apache.org/jira/browse/SPARK-16621
> Project: Spark
> Issue Type: Improvement
> Components: SQL
> Reporter: Dongjoon Hyun
>
> Currently, the generated SQL has stable IDs for `subquery`, but not-stable
> IDs for `gen_attr`. This issue provides stable IDs for `gen_attr`, too.
> The stable generated SQL will give more benefit for understanding or testing
> the queries.
> **Before**
> {code}
> scala> new org.apache.spark.sql.catalyst.SQLBuilder(sql("select 1")).toSQL
> res0: String = SELECT `gen_attr_0` AS `1` FROM (SELECT 1 AS `gen_attr_0`) AS
> gen_subquery_0
> scala> new org.apache.spark.sql.catalyst.SQLBuilder(sql("select 1")).toSQL
> res1: String = SELECT `gen_attr_4` AS `1` FROM (SELECT 1 AS `gen_attr_4`) AS
> gen_subquery_0
> {code}
> **After**
> {code}
> scala> new org.apache.spark.sql.catalyst.SQLBuilder(sql("select 1")).toSQL
> res1: String = SELECT `gen_attr_0` AS `1` FROM (SELECT 1 AS `gen_attr_0`) AS
> gen_subquery_0
> scala> new org.apache.spark.sql.catalyst.SQLBuilder(sql("select 1")).toSQL
> res2: String = SELECT `gen_attr_0` AS `1` FROM (SELECT 1 AS `gen_attr_0`) AS
> gen_subquery_0
> {code}
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