Github user rdblue commented on a diff in the pull request:
    --- Diff: 
    @@ -107,17 +106,24 @@ case class DataSourceV2Relation(
    - * A specialization of DataSourceV2Relation with the streaming bit set to 
true. Otherwise identical
    - * to the non-streaming relation.
    + * A specialization of [[DataSourceV2Relation]] with the streaming bit set 
to true.
    + *
    + * Note that, this plan has a mutable reader, so Spark won't apply 
operator push-down for this plan,
    --- End diff --
    I'm -0 on including this in a PR to improve explain results. This could 
needlessly cause commit conflicts when maintaining a branch. But, this is small 
and needs to go in somewhere. I would remove it, though.


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