morningman commented on issue #3480:
URL:
https://github.com/apache/incubator-doris/issues/3480#issuecomment-624617918
> @morningman Hi, I have the check for join type:
>
> ```
> if ((tblRef.getJoinOp().isInnerJoin() ||
tblRef.getJoinOp().isLeftOuterJoin())) {
> ```
>
> So why left semi join will be affected?
For this example:
```
select * from
join1 left semi join join2
on join1.id = join2.id and join2.id > 1;
```
When you call `join1.getJoinOp()`, the `joinOp` of table `join1` is null,
but `getJoinOp()` will
return `INNER_JOIN`.
So for table `join1`, it will pass the `if(inner join)` check, and begin to
do the predicate passing
through and push down.
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