Thanks Herman! You've helped me a lot (and am going to use your fine
explanation in my gitbook quoting when needed! :))
p.s. I also found this today that helped me too -->
https://databricks-prod-cloudfront.cloud.databricks.com/public/4027ec902e239c93eaaa8714f173bcfc/2728434780191932/1483312212640
Hi,
I'm trying to understand RewriteCorrelatedScalarSubquery optimization and
how extractCorrelatedScalarSubqueries [1] works. I don't understand how
"The expression is rewritten and returned." is done. How is the expression
rewritten?
Since it's private it's not even possible to write tests and
