Github user felixcheung commented on the issue:
https://github.com/apache/spark/pull/15231
I tested this, and this is the message I see:
```
16/10/02 05:43:17 ERROR RBackendHandler: getSQLDataType on
org.apache.spark.sql.api.r.SQLUtils failed
Error in value[[3L]](cond) : Invalid type unknown
```
I think we should lose the first part, "in value[[3L]](cond)"? Perhaps we
have the function name instead "getSQLDataType" instead?
Also I think it'd be important to differentiate where the message is coming
from, so how about this add that to the stop calls, so how about something like
```
Error in getSQLDataType : illegal argument - Invalid type unknown
```
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