okumin opened a new pull request, #4896:
URL: https://github.com/apache/hive/pull/4896
### What changes were proposed in this pull request?
This PR would add explicit type validations for the SPLIT UDF.
### Why are the changes needed?
Because we'd like to show better error messages. It should be helpful for
users, and administrators who are monitoring errors. The original message is
too primitive.
```
0: jdbc:hive2://hive-hiveserver2:10000/defaul> select split(array('a,b,c'),
',');
Error: Error while compiling statement: FAILED: ClassCastException
org.apache.hadoop.hive.serde2.objectinspector.StandardConstantListObjectInspector
cannot be cast to
org.apache.hadoop.hive.serde2.objectinspector.PrimitiveObjectInspector
(state=42000,code=40000)
```
### Does this PR introduce _any_ user-facing change?
Yes. Error messages can change.
### Is the change a dependency upgrade?
No.
### How was this patch tested?
I added integration tests.
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