Github user rxin commented on the pull request:
https://github.com/apache/spark/pull/3531#issuecomment-65174393
@scwf I am not sure if this is a good idea in general. Think about a highly
selective filter, e.g.
```sql
select * from every_body_in_the_world where company="Databricks" limit 5;
```
In this case, with your patch this query is going to run slowly on a single
thread to scan all the data ...
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