Github user yaooqinn commented on the issue:
https://github.com/apache/spark/pull/15071
@hvanhovell
For current `BroadcastHashJoinExec`, we generate join code for key is not
unique like this:
```
while (matches.hasnext) {
matched = matches.next
check and read stream side row fields
check and read build side row fieldes
reset result row
write stream side row fields to result row
write stream side row fields to result row
append(result row)
}
```
For some cases, we don't need to check/read/write the steam side repeatedly
in such while circle, e.g. `Inner Join with BuildRight`, or `BuildLeft && all
left side fields are fixed length` and so on. we may generate the code as below:
```
check and read stream side row fields
reset result row
write stream side row fields to result row
while (matches.hasnext)
{
matched = matches.next
check and read build side row fieldes
write stream side row fields to result row
append(result row)
}
```
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