Github user mgaido91 commented on a diff in the pull request:
https://github.com/apache/spark/pull/21403#discussion_r198835484
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/predicates.scala
---
@@ -161,33 +161,38 @@ case class Not(child: Expression)
true
""")
// scalastyle:on line.size.limit
-case class In(value: Expression, list: Seq[Expression]) extends Predicate {
+case class In(values: Seq[Expression], list: Seq[Expression]) extends
Predicate {
--- End diff --
I don't think so, as the `value` can be replaced later by other rules. So
we do need to have a `Seq[Expression]` here, instead of a single expression.
Another possible option which I haven't checked, but I think it may be feasible
is to create a new kind of `Expression` (eg. `InValues`) we can use only for
this specific case. What do you think?
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