GitHub user gatorsmile opened a pull request:
https://github.com/apache/spark/pull/15902
[SPARK-18430][SQL][BACKPORT-2.0] Fixed Exception Messages when Hitting an
Invocation Exception of Function Lookup
### What changes were proposed in this pull request?
This PR is to backport https://github.com/apache/spark/pull/15878
When the exception is an invocation exception during function lookup, we
return a useless/confusing error message:
For example,
```Scala
df.selectExpr("concat_ws()")
```
Below is the error message we got:
```
null; line 1 pos 0
org.apache.spark.sql.AnalysisException: null; line 1 pos 0
```
To get the meaningful error message, we need to get the cause. The fix is
exactly the same as what we did in https://github.com/apache/spark/pull/12136.
After the fix, the message we got is the exception issued in the constuctor of
function implementation:
```
requirement failed: concat_ws requires at least one argument.; line 1 pos 0
org.apache.spark.sql.AnalysisException: requirement failed: concat_ws
requires at least one argument.; line 1 pos 0
```
### How was this patch tested?
Added test cases.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/gatorsmile/spark functionNotFound20
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/15902.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 #15902
----
commit 4a42c13fcbae1f1d9cdfe9d05dc19cf64e1a5ca1
Author: gatorsmile <gatorsm...@gmail.com>
Date: 2016-11-16T07:34:30Z
backport
----
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