Github user BruceXu1991 commented on a diff in the pull request:
https://github.com/apache/spark/pull/20034#discussion_r158472814
--- Diff:
sql/hive/src/main/scala/org/apache/spark/sql/hive/client/HiveClientImpl.scala
---
@@ -186,7 +186,7 @@ private[hive] class HiveClientImpl(
/** Returns the configuration for the current session. */
def conf: HiveConf = state.getConf
- private val userName = state.getAuthenticator.getUserName
+ private val userName = conf.getUser
--- End diff --
yes, i met this problem by using MySQL as Hive metastore.
what's more, when I execute DESCRIBE FORMATTED spark_22846,
NullPointerException will occur.
'''
> DESCRIBE FORMATTED offline.spark_22846;
Error: java.lang.NullPointerException (state=,code=0)
'''
and the detail stack info:
```
17/12/22 18:18:10 ERROR SparkExecuteStatementOperation: Error executing
query, currentState RUNNING,
java.lang.NullPointerException
at
scala.collection.immutable.StringOps$.length$extension(StringOps.scala:47)
at scala.collection.immutable.StringOps.length(StringOps.scala:47)
at
scala.collection.IndexedSeqOptimized$class.isEmpty(IndexedSeqOptimized.scala:27)
at scala.collection.immutable.StringOps.isEmpty(StringOps.scala:29)
at
scala.collection.TraversableOnce$class.nonEmpty(TraversableOnce.scala:111)
at scala.collection.immutable.StringOps.nonEmpty(StringOps.scala:29)
at
org.apache.spark.sql.catalyst.catalog.CatalogTable.toLinkedHashMap(interface.scala:301)
at
org.apache.spark.sql.execution.command.DescribeTableCommand.describeFormattedTableInfo(tables.scala:559)
at
org.apache.spark.sql.execution.command.DescribeTableCommand.run(tables.scala:537)
at
org.apache.spark.sql.execution.command.ExecutedCommandExec.sideEffectResult$lzycompute(commands.scala:58)
at
org.apache.spark.sql.execution.command.ExecutedCommandExec.sideEffectResult(commands.scala:56)
at
org.apache.spark.sql.execution.command.ExecutedCommandExec.executeCollect(commands.scala:67)
at org.apache.spark.sql.Dataset.<init>(Dataset.scala:183)
at org.apache.spark.sql.Dataset$.ofRows(Dataset.scala:68)
at org.apache.spark.sql.SparkSession.sql(SparkSession.scala:767)
at org.apache.spark.sql.SQLContext.sql(SQLContext.scala:691)
```
this result of NPE is that owner is null. The relevant source code is below:
```
def toLinkedHashMap: mutable.LinkedHashMap[String, String] = {
.........
line 301: if (owner.nonEmpty) map.put("Owner", owner)
........
}
```
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