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https://issues.apache.org/jira/browse/SPARK-27253?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Hyukjin Kwon resolved SPARK-27253.
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Resolution: Fixed
Fix Version/s: 3.0.0
Issue resolved by pull request 24189
[https://github.com/apache/spark/pull/24189]
> SparkSession clone discards SQLConf overrides in favor of SparkConf defaults
> ----------------------------------------------------------------------------
>
> Key: SPARK-27253
> URL: https://issues.apache.org/jira/browse/SPARK-27253
> Project: Spark
> Issue Type: Bug
> Components: Structured Streaming
> Affects Versions: 2.4.0
> Reporter: Jose Torres
> Assignee: Chakravarthi
> Priority: Major
> Fix For: 3.0.0
>
>
> SparkSession.cloneSession() is normally supposed to create a child session
> which inherits all the SQLConf values of its parent session. But when a SQL
> conf is given a global default through the SparkConf, this does not happen;
> the child session will receive the SparkConf default rather than its parent's
> SQLConf override.
>
> This is particularly impactful in structured streaming, as the microbatches
> run in a cloned child session.
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