Github user dilipbiswal commented on the pull request:
https://github.com/apache/spark/pull/11596#issuecomment-194130778
@cloud-fan Thank you.
1. Can any Generate operator be converted to a LATERAL VIEW? Does the plan
tree have to match some kind of pattern?
Yes, based on the tests i have tried. I am testing this more to see if i
uncover any issue. Now i am converting
```SQL
select explode(array(1,2,3)) from t1
```
to
```SQL
select tablequalifier.colname from t1 LATERAL VIEW explode(array(1,2,3))
tablequalifier as colname
```
2. Can any Generate operator be converted to a "SELECT ...udtf..." format?
No. As we have a restriction of allowing one generate in a projection list.
Thats why we try to
use the LATERAL VIEW clause.
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