Github user kiszk commented on a diff in the pull request:
https://github.com/apache/spark/pull/22039#discussion_r208666588
--- Diff:
sql/core/src/main/scala/org/apache/spark/sql/execution/streaming/state/SymmetricHashJoinStateManager.scala
---
@@ -273,6 +273,9 @@ class SymmetricHashJoinStateManager(
s.copy(desc = newDesc(desc)) -> value
case (s @ StateStoreCustomTimingMetric(_, desc), value) =>
s.copy(desc = newDesc(desc)) -> value
+ case (s, _) =>
+ throw new IllegalArgumentException(
+ s"Unknown state store custom metric is found at metrics: $s")
--- End diff --
nit: 2 more spaces?
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