GitHub user gatorsmile opened a pull request:
https://github.com/apache/spark/pull/11208
[SPARK-13320] [SQL] Star Expansion for Dataframe/Dataset Functions
This PR resolves two issues:
First, expanding * inside aggregate functions of structs when using
Dataframe/Dataset APIs. For example,
```scala
structDf.groupBy($"a").agg(min(struct($"record.*")))
```
Second, it improves the error messages when invalid star usage.
```scala
pagecounts4PartitionsDS
.map(line => (line._1, line._3))
.toDF()
.groupBy($"_1")
.agg(sum("*") as "sumOccurances")
```
Before the fix, the invalid usage will issue confusing the error message:
```
org.apache.spark.sql.AnalysisException: cannot resolve '_1' given input
columns _1, _2;
```
cc: @rxin @nongli @cloud-fan
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/gatorsmile/spark sumDataSetResolution
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/11208.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 #11208
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