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https://issues.apache.org/jira/browse/SPARK-20519?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15988111#comment-15988111
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Apache Spark commented on SPARK-20519:
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User '10110346' has created a pull request for this issue:
https://github.com/apache/spark/pull/17796
> When the input parameter is null, may be a runtime exception occurs
> --------------------------------------------------------------------
>
> Key: SPARK-20519
> URL: https://issues.apache.org/jira/browse/SPARK-20519
> Project: Spark
> Issue Type: Improvement
> Components: Spark Core, SQL
> Affects Versions: 2.1.0
> Reporter: liuxian
> Priority: Minor
>
> sqlContext.tables(null)
> setCustomHostname(null)
> checkHost(null, "test")
> checkHostPort(null, "test")
> throws exception at runtime:
> java.lang.NullPointerException was thrown.
> java.lang.NullPointerException
> at
> org.apache.spark.sql.catalyst.catalog.SessionCatalog.formatDatabaseName(SessionCatalog.scala:125)
> at
> org.apache.spark.sql.catalyst.catalog.SessionCatalog.listTables(SessionCatalog.scala:715)
> at
> org.apache.spark.sql.catalyst.catalog.SessionCatalog.listTables(SessionCatalog.scala:706)
> at
> org.apache.spark.sql.execution.command.ShowTablesCommand$$anonfun$11.apply(tables.scala:655)
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