viirya commented on pull request #32586:
URL: https://github.com/apache/spark/pull/32586#issuecomment-856928680
Yea, seems like. For non parent-child expressions, the order seems not
related, but just need to make it consistent. Will submit a follow up to fix it.
```scala
if (x.semanticEquals(y)) {
0
} else if (x.find(_.semanticEquals(y)).isDefined) {
1
} else {
// instead of -1, we need to return a consistent comparison
}
```
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