gengliangwang commented on code in PR #50631:
URL: https://github.com/apache/spark/pull/50631#discussion_r2057784973
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sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/constraints.scala:
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@@ -198,3 +268,30 @@ case class ForeignKeyConstraint(
copy(userProvidedCharacteristic = c)
}
}
+
+
+/** This class is used to represent a collection of constraints in a table.
+ * It is used for analysis purposes only.
+ *
+ * @param children The list of constraint expressions
+ */
+case class Constraints(children: Seq[Expression]) extends Expression with
Unevaluable {
Review Comment:
> BTW why do we need this container? can't we directly put
Seq[TableConstraint] into TableSpec?
The implementation of `UnresolvedTableSpec.withNewChildrenInternal` would be
a bit ugly...but you are right, having the container seems more complicated
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