viirya commented on a change in pull request #28975: URL: https://github.com/apache/spark/pull/28975#discussion_r449689477
########## File path: sql/core/src/main/scala/org/apache/spark/sql/execution/streaming/state/SymmetricHashJoinStateManager.scala ########## @@ -451,10 +451,25 @@ class SymmetricHashJoinStateManager( } private trait KeyWithIndexToValueRowConverter { + /** Defines the schema of the value row (the value side of K-V in state store). */ def valueAttributes: Seq[Attribute] + /** + * Convert the value row to (actual value, match) pair. + * + * NOTE: implementations should ensure the result row is NOT reused during execution, as + * caller may use the value to store without copy(). Review comment: I recall in Spark SQL, there are some places similar and usually we make it as the caller's responsibility to call copy. Is this a code path critical for performance? ---------------------------------------------------------------- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. For queries about this service, please contact Infrastructure at: us...@infra.apache.org --------------------------------------------------------------------- To unsubscribe, e-mail: reviews-unsubscr...@spark.apache.org For additional commands, e-mail: reviews-h...@spark.apache.org