Github user marmbrus commented on a diff in the pull request:
https://github.com/apache/spark/pull/2561#discussion_r18439078
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/predicates.scala
---
@@ -95,6 +95,22 @@ case class In(value: Expression, list: Seq[Expression])
extends Predicate {
}
}
+/**
+ * Optimized version of In clause, when all filter values of In clause are
+ * static.
+ */
+case class InSet(value: Expression, hset: HashSet[Any], child:
Seq[Expression])
+ extends Predicate {
+ def children = child
+
+ def nullable = true // TODO: Figure out correct nullability semantics of
IN.
+ override def toString = s"$value IN ${hset.mkString("(", ",", ")")}"
--- End diff --
I'd actually say InSet here as the `toString` is mostly for debugging /
understanding how queries will execute.
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