GitHub user dongjoon-hyun opened a pull request:
https://github.com/apache/spark/pull/14355
[SPARK-16726][SQL] Improve error message for `Union` queries for
incompatible types
## What changes were proposed in this pull request?
Currently, `UNION` queries on incompatible types show misleading error
messages, i.e., `unresolved operator Union`. We had better show a more correct
message.
**Before**
```
scala> sql("select 1 union (select array(1))")
org.apache.spark.sql.AnalysisException: unresolved operator 'Union;
```
**After**
```
scala> sql("select 1 union (select array(1))")
org.apache.spark.sql.AnalysisException: Unions can only be performed on
tables with the compatible column types, but one table has '[IntegerType]' and
another table has '[ArrayType(IntegerType,false)]';
```
## How was this patch tested?
Pass the Jenkins test with a new test case.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/dongjoon-hyun/spark SPARK-16726
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/14355.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 #14355
----
commit 98682a53b28a2848727599f1d06898cd70e8a19e
Author: Dongjoon Hyun <[email protected]>
Date: 2016-07-26T00:10:02Z
[SPARK-16726][SQL] Improve error message for `Union` queries for
incompatible types
----
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