Github user wzhfy commented on the issue:
https://github.com/apache/spark/pull/16228
@Tagar Thanks for sharing this information. Yes, it would be better to use
PK/FK, but it won't be done in this pr, and we need to implement PK/FK
constraints in Spark first.
> the assumption is if two tables being joined by columns with the same
name, join columns have the same stats / set of values?
It is true for inner join, but not true for outer joins, right?
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