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https://issues.apache.org/jira/browse/SPARK-50007?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17890377#comment-17890377
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Jungtaek Lim commented on SPARK-50007:
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Going to submit a PR.
> metrics defined by observe API are lost when the physical node is pruned out
> ----------------------------------------------------------------------------
>
> Key: SPARK-50007
> URL: https://issues.apache.org/jira/browse/SPARK-50007
> Project: Spark
> Issue Type: Bug
> Components: Structured Streaming
> Affects Versions: 4.0.0, 3.4.3, 3.5.3
> Reporter: Jungtaek Lim
> Priority: Major
>
> When user defines the metrics via observe API, they expect the metrics to be
> retrieved via Observation (batch query) or update event of
> StreamingQueryListener.
> But when the node (CollectMetrics) is lost in any reason (e.g. subtree is
> pruned by PruneFilters), Spark does behave like the metrics were not defined,
> instead of providing default values.
> Spark should give a best effort to provide default values - when the node is
> pruned out from optimizer, it is mostly logically equivalent that there were
> no input being processed with the node (except the bug in
> analyzer/optimizer/etc which drop the node incorrectly), hence it's valid to
> just have default value.
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