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Posted to reviews@spark.apache.org by GitBox <gi...@apache.org> on 2019/07/31 18:34:04 UTC
[GitHub] [spark] nvander1 edited a comment on issue #24761: [SPARK-27905]
[SQL] Add higher order function 'forall'
nvander1 edited a comment on issue #24761: [SPARK-27905] [SQL] Add higher order function 'forall'
URL: https://github.com/apache/spark/pull/24761#issuecomment-516963973
I think this summarizes the expected behavior for forall with three valued logic:
```
/*
* true for all non null elements foundNull result
* F F F
* F T F
* T F T
* T T N
*/
```
And this is captured by the following check
```
if (foundNull && forall) {
null
} else {
forall
}
```
What do you think?
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