GitHub user MaxGekk opened a pull request:
https://github.com/apache/spark/pull/21410
[SPARK-24366][SQL] Improving of error messages for type converting
## What changes were proposed in this pull request?
Currently, users are getting the following error messages on type
conversions:
```
scala.MatchError: test (of class java.lang.String)
```
The message doesn't give any clues to the users where in the schema the
error happened. In this PR, I would like to improve the error message like:
```
The value (test) of the type (java.lang.String) cannot be converted to
struct<f1:int>
```
## How was this patch tested?
Added tests for converting of wrong values to `struct`, `map`, `array`,
`string` and `decimal`.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/MaxGekk/spark-1 type-conv-error
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/21410.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 #21410
----
commit 26cc2f84ee6324db23936e20816d240031211311
Author: Maxim Gekk <maxim.gekk@...>
Date: 2018-05-23T12:22:33Z
Improving of error messages for type conversions
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