Impala uses _c# aliases for functions when a query is run against a view

Impala uses _c# aliases for functions when a query is run against a view, while it does not use it when the same query is run against the real table. This is preventing applications to run transparently on the view. Impala should not use _c# aliases, unless necessary.

Query: select avg(col1) from impala_test_table
+-----------+
| avg(col1) |
+-----------+
| 1.5       |
+-----------+

Query: select avg(col1) from impala_test_view
+-----+
| _c0 |
+-----+
| 1.5 |
+-----+