@Sean Owen Thank you very much. And I saw your reply
comment in https://issues.apache.org/jira/browse/SPARK-28519, I will test
with modification and to see whether there are other similar tests fail,
and will address them together in one pull request.
On Sat, Jul 27, 2019 at 9:04 PM Sean Owen
Hi all:
i want to ask a question about broadcast join in spark sql.
```
select A.*,B.nsf_cards_ratio * 1.00 / A.nsf_on_entry as nsf_ratio_to_pop
from B
left join A
on trim(A.country) = trim(B.cntry_code);
```
here A is a small table only 8 rows, but somehow the statistics of table A
