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https://issues.apache.org/jira/browse/SPARK-32991?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17201806#comment-17201806
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Xiao Li commented on SPARK-32991:
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ping [~Qin Yao] [~yumwang]
> RESET can clear StaticSQLConfs
> ------------------------------
>
> Key: SPARK-32991
> URL: https://issues.apache.org/jira/browse/SPARK-32991
> Project: Spark
> Issue Type: Improvement
> Components: SQL
> Affects Versions: 3.0.1
> Reporter: Herman van Hövell
> Priority: Major
>
> The RESET command can clear a sessions' static SQL configurations, when that
> static SQL configuration was set on a SparkSession that uses a pre-existing
> SparkContext. Here is repro:
> {code:java}
> // Blow away any pre-existing session thread locals
> org.apache.spark.sql.SparkSession.clearDefaultSession()
> org.apache.spark.sql.SparkSession.clearActiveSession()
> // Create new session and explicitly set a spark context
> val newSession = org.apache.spark.sql.SparkSession.builder
> .sparkContext(sc)
> .config("spark.sql.globalTempDatabase", "bob")
> .getOrCreate()
> assert(newSession.conf.get("spark.sql.globalTempDatabase") == "bob")
> newSession.sql("reset")
> assert(newSession.conf.get("spark.sql.globalTempDatabase") == "bob") // Boom!
> {code}
> The problem is that RESET assumes it can use the SparkContext's
> configurations as its default.
>
>
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