unresolved operator union in Spark 1.6

[马阳阳]

Hi all,

We encountered the following problem when using Spark 1.6.

The following SQL:

```

SELECT a,b,c FROM A UNION ALL SELECT a,b,c FROM B

```

If A and B are two views created with SQLContext.registerDataFrameAsTable(), 
Spark will fail with “unresolved operator Union”.

But if A and B are saved to two hive temp tables, respectively, Spark can run 
the sql successfully.

The sql is run with HiveContext.sql(().

 

Any help is appreciated.