Github user nsyca commented on the issue:
https://github.com/apache/spark/pull/17286
@gatorsmile An equality join in most cases has a better filtering than an
inequality join. This can be used heuristically. However, this is not always
true. An equality join can be a lookup join from a fact table to a dimension
table that it does not reduce anything but an inequality join such as a range
join over time period.
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