Github user wzhfy commented on the issue:
https://github.com/apache/spark/pull/17930
Not introduced by this pr, but I just saw a style nit
[here](https://github.com/apache/spark/pull/17930/files#diff-1d14ac233eac6f233c027dba0bdf871dR140)
```
if (conditions.isEmpty && query.output.size != 1) {
failAnalysis(
s"Scalar subquery must return only one column, but got
${query.output.size}")
}
else if (conditions.nonEmpty) {
```
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