c0b3e45e3b
## What changes were proposed in this pull request? A one-liner change in `ShuffleExchange.nodeName` to cover the case when `coordinator` is `null`, so that the match expression is exhaustive. Please refer to [SPARK-20872](https://issues.apache.org/jira/browse/SPARK-20872) for a description of the symptoms. TL;DR is that inspecting a `ShuffleExchange` (directly or transitively) on the Executor side can hit a case where the `coordinator` field of a `ShuffleExchange` is null, and thus will trigger a `MatchError` in `ShuffleExchange.nodeName()`'s inexhaustive match expression. Also changed two other match conditions in `ShuffleExchange` on the `coordinator` field to be consistent. ## How was this patch tested? Manually tested this change with a case where the `coordinator` is null to make sure `ShuffleExchange.nodeName` doesn't throw a `MatchError` any more. Author: Kris Mok <kris.mok@databricks.com> Closes #18095 from rednaxelafx/shuffleexchange-nodename. |
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