grundprinzip opened a new pull request, #60:
URL: https://github.com/apache/spark-connect-go/pull/60
### What changes were proposed in this pull request?
This patch is adding the initial version of `GroupBy` that can be used to
run aggregatequeries. It allows to run the following code:
```
df, _ := spark.Sql(ctx, "select * from range(10)")
df, _ = df.GroupBy("id").Min() // Will return 0
```
### Why are the changes needed?
Compatibility
### Does this PR introduce _any_ user-facing change?
GroupBy support
### How was this patch tested?
Unit and Integration tests.
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