Github user peter-toth commented on the issue:
https://github.com/apache/spark/pull/22318
Also please consider that currently (and also after this PR) using `b` and
`c` from the description:
```
b.join(c, b("id") === b("id"), "inner")
```
is interpreted as
```
b.join(c, b("id") === c("id"), "inner")
```
so my PR just extends this feature to the case with subsequent joins.
@cloud-fan , @viirya what do you think?
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