JoshRosen opened a new pull request #25183: [SPARK-28430][UI] Fix stage table rendering when some tasks' metrics are missing URL: https://github.com/apache/spark/pull/25183 ## What changes were proposed in this pull request? The Spark UI's stages table misrenders the input/output metrics columns when some tasks are missing input metrics. See the screenshot below for an example of the problem:  This is because those columns' are defined as ```scala {if (hasInput(stage)) { metricInfo(task) { m => ... <td>....</td> } } ``` where `metricInfo` renders the node returned by the closure in case metrics are defined or returns `Nil` in case metrics are not defined. If metrics are undefined then we'll fail to render the empty `<td></td>` tag, causing columns to become misaligned as shown in the screenshot. To fix this, this patch changes this to ```scala {if (hasInput(stage)) { <td>{ metricInfo(task) { m => ... Unparsed(...) } }</td> } ``` which is an idiom that's already in use for the shuffle read / write columns. ## How was this patch tested? It isn't. I'm arguing for correctness because the modifications are consistent with rendering methods that work correctly for other columns.
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