Github user mengxr commented on a diff in the pull request:
https://github.com/apache/spark/pull/15567#discussion_r84340352
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/codegen/GeneratePredicate.scala
---
@@ -25,19 +25,26 @@ import org.apache.spark.sql.catalyst.expressions._
*/
abstract class Predicate {
def eval(r: InternalRow): Boolean
+
+ /**
+ * Initialize internal states given the current partition index.
+ * This is used by non-deterministic expressions to set initial states.
+ * The default implementation does nothing.
+ */
+ def initializeStatesForPartition(partitionIndex: Int): Unit = {}
--- End diff --
I didn't test. Would doing that hurt the performance?
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