Github user dongjoon-hyun commented on the issue:
https://github.com/apache/spark/pull/13876
To show as an example, I added `trait Optimizable` having `optimizable`
flag.
This is similar with `foldable` or `nullable`. But, it's not a general
concept for all `Expression`, so I made a trait.
Could you take a look at this, @rxin ?
I think `Optimize-Once` is really important to make Spark optimizer faster.
---
If your project is set up for it, you can reply to this email and have your
reply appear on GitHub as well. If your project does not have this feature
enabled and wishes so, or if the feature is enabled but not working, please
contact infrastructure at infrastruct...@apache.org or file a JIRA ticket
with INFRA.
---
---------------------------------------------------------------------
To unsubscribe, e-mail: reviews-unsubscr...@spark.apache.org
For additional commands, e-mail: reviews-h...@spark.apache.org
