impalad crash on VARCHAR query

Here's an error I got running a join query against tables with different VARCHAR lengths. Here's the repro info:

[localhost:21000] > create table varchar_1 (s varchar(1));
[localhost:21000] > create table varchar_4 (s varchar(4));
[localhost:21000] > create table varchar_20 (s varchar(20));
[localhost:21000] > insert into varchar_1 values (cast('a' as varchar(1))), (cast('b' as varchar(1))), (cast('hello' as varchar(1))), (cast('world' as varchar(1)));
[localhost:21000] > insert into varchar_4 values (cast('a' as varchar(4))), (cast('b' as varchar(4))), (cast('hello' as varchar(4))), (cast('world' as varchar(4)));
[localhost:21000] > insert into varchar_20 values (cast('a' as varchar(20))), (cast('b' as varchar(20))), (cast('hello' as varchar(20))), (cast('world' as varchar(20)));
[localhost:21000] > select * from varchar_1;
---

---

---
[localhost:21000] > select * from varchar_4;
------

------

------
[localhost:21000] > select * from varchar_20;
-------

-------

-------
[localhost:21000] > select s from varchar_1 join varchar_20 using (s);
ERROR: AnalysisException: unqualified column reference 's' is ambiguous
[localhost:21000] > select varchar_1.s from varchar_1 join varchar_20 using (s);
Error communicating with impalad: TSocket read 0 bytes

select version();
----------------------------------------------------------------------------------------------

----------------------------------------------------------------------------------------------

----------------------------------------------------------------------------------------------