Github user mgaido91 commented on a diff in the pull request:
https://github.com/apache/spark/pull/21403#discussion_r199086016
--- 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 am not sure. The behavior when comparing structs in not uniform among
different DBs. Hive doesn't allow `=` on structs. Postgres and Presto does, but
their behavior with nulls is not consistent and it is different from ours. In
particular, comparing a struct containing a `null` returns `null` on Postgres
and causes an exception in Presto (we return `false` instead). This is causing
another problem which has been reported in another JIRA for which we can return
results different from Postgres and Oracle (SPARK-24395).
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