We are using calcite to query data in Kudu. We have implemented our own
sort rule that merges rows returned from kudu when a queries orders by
columns in the same order as the primary key of the kudu table.
For a query that does a left join, in order to get the planner to use my
sort rule I had to
Hi Thomas,
It is not safe to push the filter in the null generating side of a join
since
it changes the semantics of the query. Consider the example below.
SELECT b.title
FROM Book b
LEFT JOIN Author a ON b.author = a.id
WHERE a.name <> 'Victor'
Author
--
id | name |
1 | Victor |
Stamatis,
Thank you for your explanation, this makes sense now.
On Fri, Sep 13, 2019 at 2:58 PM Stamatis Zampetakis
wrote:
> Hi Thomas,
>
> It is not safe to push the filter in the null generating side of a join
> since
> it changes the semantics of the query. Consider the example below.
>
> SE
