srowen commented on a change in pull request #30924:
URL: https://github.com/apache/spark/pull/30924#discussion_r549343608
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File path:
core/src/main/scala/org/apache/spark/rdd/SequenceFileRDDFunctions.scala
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@@ -32,16 +32,13 @@ import org.apache.spark.internal.Logging
* @note This can't be part of PairRDDFunctions because we need more implicit
parameters to
* convert our keys and values to Writable.
*/
-class SequenceFileRDDFunctions[K <% Writable: ClassTag, V <% Writable :
ClassTag](
+class SequenceFileRDDFunctions[K: IsWritable: ClassTag, V: IsWritable:
ClassTag](
Review comment:
I see, yeah we can't add implicits without changing the signature. Hm, I
can't think of other ways to write it. I think this change is OK. I'd leave a
note in the comments of IsWritable about why it exists, with a link to the
suggestion from scala Q&A.
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