Github user jkbradley commented on the pull request:
https://github.com/apache/spark/pull/5992#issuecomment-116911164
@mengxr My motivation for creating SPARK-7137 was to print more help info
when schema checks fail. Currently, we say something like:
```
Column features must be of type StringType but was actually DoubleType.
```
It would be nice to print more info, particularly which PipelineStage
caused the problem and which parameter that column is specified by:
```
... This column is specified via parameter "inputCol" from "lr_32983" with
description: ...
```
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