grundprinzip opened a new pull request, #38841:
URL: https://github.com/apache/spark/pull/38841
### What changes were proposed in this pull request?
Previously, the `avg` function was missing in the `GroupedData` class. This
patch adds this method and the necessary plan transformation using an
unresolved function. In addition, it identified a small issue where when an
alias is used for a grouping column, the planner would incorrectly try to wrap
the existing alias expression using an unresolved alias which would then fail.
```
df = (
self.connect.range(10)
.groupBy((col("id") % lit(2)).alias("moded"))
.avg("id")
.sort("moded")
)
```
### Why are the changes needed?
Bug / Compatibility
### Does this PR introduce _any_ user-facing change?
No
### How was this patch tested?
UT
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