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https://issues.apache.org/jira/browse/SPARK-16621?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Cheng Lian resolved SPARK-16621.
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Resolution: Fixed
Fix Version/s: 2.1.0
Issue resolved by pull request 14257
[https://github.com/apache/spark/pull/14257]
> Generate stable SQLs in SQLBuilder
> ----------------------------------
>
> Key: SPARK-16621
> URL: https://issues.apache.org/jira/browse/SPARK-16621
> Project: Spark
> Issue Type: Sub-task
> Components: SQL
> Reporter: Dongjoon Hyun
> Fix For: 2.1.0
>
>
> Currently, the generated SQLs have not-stable IDs for generated attributes.
> The stable generated SQL will give more benefit for understanding or testing
> the queries. This issue provides stable SQL generation by the followings.
> * Provide unique ids for generated subqueries, `gen_subquery_xxx`.
> * Provide unique and stable ids for generated attributes, `gen_attr_xxx`.
> **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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