Dispose related readers in GroupBySplitQueryingEnumerable #36484
+32
−7
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Adding test coverage here is quite difficult/impractical - the bug is that a certain internal resource (DbDataReader) doesn't get disposed, which isn't something visible we can check. In any case, the fix is quite trivial and follows the same pattern as for the very similar SplitQueryingEnumerable (non-GroupBy).
Fixes #34280