Github user Sephiroth-Lin commented on the pull request:
https://github.com/apache/spark/pull/7417#issuecomment-123925858
@hvanhovell I use tpc-ds to test, for below SQL clause:
```
with single_value as (
select 1 tpcds_val from date_dim
)
select sum(ss_quantity * ss_sales_price) ssales, tpcds_val
from store_sales, single_value
group by tpcds_val
```
use this patch run1h55min, without this patch run half tasks use 16.7h
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