GitHub user gatorsmile opened a pull request:
https://github.com/apache/spark/pull/19395
[SPARK-22171] [SQL] Describe Table Extended Failed when Table Owner is Empty
## What changes were proposed in this pull request?
Users could hit `java.lang.NullPointerException` when the tables were
created by Hive and the table's owner is `null` that are got from Hive
metastore. `DESC EXTENDED` failed with the error:
> SQLExecutionException: 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:300)
at
org.apache.spark.sql.execution.command.DescribeTableCommand.describeFormattedTableInfo(tables.scala:565)
at
org.apache.spark.sql.execution.command.DescribeTableCommand.run(tables.scala:543)
at
org.apache.spark.sql.execution.command.ExecutedCommandExec.sideEffectResult$lzycompute(commands.scala:66)
at
## How was this patch tested?
Added a unit test case
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/gatorsmile/spark desc
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/19395.patch
To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:
This closes #19395
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commit 9b2cc4c5df6211e2fb1e995d95340c9f84b7e5a4
Author: gatorsmile <gatorsm...@gmail.com>
Date: 2017-09-29T23:36:08Z
fix
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