HeartSaVioR commented on pull request #28326:
URL: https://github.com/apache/spark/pull/28326#issuecomment-620310834
Sorry for maybe out-of-topic, but I'm seeing that column metadata may have
more issues due to not properly defined its usage and how it should be handled.
I'm actually
HeartSaVioR commented on pull request #28326:
URL: https://github.com/apache/spark/pull/28326#issuecomment-620272637
Just FYI, looks like the merged commit doesn't reflect the credit properly
(not showing as 2 authors) - maybe because of the authorship of the first
commit. author and commi
HeartSaVioR commented on pull request #28326:
URL: https://github.com/apache/spark/pull/28326#issuecomment-619831846
> Each Attribute/Alias has its own metadata and can easily be hidden by the
outer-most Alias.
Yeah I see the concern - I'm not sure the column metadata was considered
HeartSaVioR commented on pull request #28326:
URL: https://github.com/apache/spark/pull/28326#issuecomment-619751876
> Sometimes we have to, for example, a + b as c, what should be the metadata
of c?
The metadata of expression for `a + b` if there's no explicit set of
metadata. That
HeartSaVioR commented on pull request #28326:
URL: https://github.com/apache/spark/pull/28326#issuecomment-619722391
(Please consider that I'm not an expert of SQL area.)
I've read through the code around Alias and played with the reproducer
(test), and feel #24457 is the fix address
