cloud-fan commented on code in PR #50631:
URL: https://github.com/apache/spark/pull/50631#discussion_r2057672347
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sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/constraints.scala:
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@@ -158,9 +199,21 @@ case class UniqueConstraint(
override val userProvidedName: String = null,
override val tableName: String = null,
override val userProvidedCharacteristic: ConstraintCharacteristic =
ConstraintCharacteristic.empty)
- extends TableConstraint {
+ extends LeafExpression
+ with TableConstraint {
Review Comment:
```suggestion
extends LeafExpression with TableConstraint {
```
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