Github user watermen commented on the pull request:
https://github.com/apache/spark/pull/13321#issuecomment-222039122
@cloud-fan I found this bug when I run
```sql
SELECT COUNT(*) FROM bucketed_table;
```
and the sql below also can't be benefited from bucketing but it's right.
```sql
SELECT i, j, k FROM bucketed_table;
```
I think we should support legal syntax on every table. When the columns
going to be read include all bucket columns, we can benefit from bucketing. But
others, we should still get the right result. Sometimes, user may delete the
origin table, and only keep the bucketed table.
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