nafshartous opened a new pull request #28492:
URL: https://github.com/apache/spark/pull/28492
### What changes were proposed in this pull request?
Adding class `MultiTransformer` to allow encapsulation of a sequence of
transforms.
### Why are the changes needed?
Requested in the SPARK-2749 as the current API is limiting.
### Does this PR introduce _any_ user-facing change?
No
### How was this patch tested?
By running the new example
```
bin/run-example ml.MultiTransformerExample
```
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