GitHub user maropu opened a pull request:
https://github.com/apache/spark/pull/17191
[SPARK-14471][SQL] Aliases in SELECT could be used in GROUP BY
## What changes were proposed in this pull request?
This pr added a new rule in `Analyzer` to resolve aliases in `GROUP BY`.
The current master throws an exception if `GROUP BY` clauses have aliases
in `SELECT`;
```
scala> spark.sql("select a a1, a1 + 1 as b, count(1) from t group by a1")
org.apache.spark.sql.AnalysisException: cannot resolve '`a1`' given input
columns: [a]; line 1 pos 51;
'Aggregate ['a1], [a#83L AS a1#87L, ('a1 + 1) AS b#88, count(1) AS
count(1)#90L]
+- SubqueryAlias t
+- Project [id#80L AS a#83L]
+- Range (0, 10, step=1, splits=Some(8))
at
org.apache.spark.sql.catalyst.analysis.package$AnalysisErrorAt.failAnalysis(package.scala:42)
at
org.apache.spark.sql.catalyst.analysis.CheckAnalysis$$anonfun$checkAnalysis$1$$anonfun$apply$2.applyOrElse(CheckAnalysis.scala:77)
at
org.apache.spark.sql.catalyst.analysis.CheckAnalysis$$anonfun$checkAnalysis$1$$anonfun$apply$2.applyOrElse(CheckAnalysis.scala:74)
at
org.apache.spark.sql.catalyst.trees.TreeNode$$anonfun$transformUp$1.apply(TreeNode.scala:289)
```
## How was this patch tested?
Added tests in `SQLQuerySuite` and `SQLQueryTestSuite`.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/maropu/spark SPARK-14471
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/17191.patch
To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:
This closes #17191
----
commit 3ba9e444440a1fee4e78b46a7bfbcde6e1b7c8df
Author: Takeshi Yamamuro <[email protected]>
Date: 2017-03-07T12:28:47Z
Resolve aliases in GROUP-BY
----
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