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https://issues.apache.org/jira/browse/SPARK-17328?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15547102#comment-15547102
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Dongjoon Hyun commented on SPARK-17328:
---------------------------------------
Thank YOU, [~ja...@japila.pl]!
> NPE with EXPLAIN DESCRIBE TABLE
> -------------------------------
>
> Key: SPARK-17328
> URL: https://issues.apache.org/jira/browse/SPARK-17328
> Project: Spark
> Issue Type: Bug
> Components: SQL
> Affects Versions: 2.0.1
> Reporter: Jacek Laskowski
> Priority: Minor
>
> With today's build:
> {code}
> scala> sql("EXPLAIN DESCRIBE TABLE x").show(truncate = false)
> INFO SparkSqlParser: Parsing command: EXPLAIN DESCRIBE TABLE x
> java.lang.NullPointerException
> at
> org.apache.spark.sql.execution.command.ExplainCommand.run(commands.scala:104)
> at
> org.apache.spark.sql.execution.command.ExecutedCommandExec.sideEffectResult$lzycompute(commands.scala:60)
> at
> org.apache.spark.sql.execution.command.ExecutedCommandExec.sideEffectResult(commands.scala:58)
> at
> org.apache.spark.sql.execution.command.ExecutedCommandExec.doExecute(commands.scala:74)
> at
> org.apache.spark.sql.execution.SparkPlan$$anonfun$execute$1.apply(SparkPlan.scala:115)
> at
> org.apache.spark.sql.execution.SparkPlan$$anonfun$execute$1.apply(SparkPlan.scala:115)
> at
> org.apache.spark.sql.execution.SparkPlan$$anonfun$executeQuery$1.apply(SparkPlan.scala:136)
> at
> org.apache.spark.rdd.RDDOperationScope$.withScope(RDDOperationScope.scala:151)
> at
> org.apache.spark.sql.execution.SparkPlan.executeQuery(SparkPlan.scala:133)
> at org.apache.spark.sql.execution.SparkPlan.execute(SparkPlan.scala:114)
> at
> org.apache.spark.sql.execution.QueryExecution.toRdd$lzycompute(QueryExecution.scala:88)
> at
> org.apache.spark.sql.execution.QueryExecution.toRdd(QueryExecution.scala:88)
> at org.apache.spark.sql.Dataset.<init>(Dataset.scala:182)
> at org.apache.spark.sql.Dataset$.ofRows(Dataset.scala:62)
> at org.apache.spark.sql.SparkSession.sql(SparkSession.scala:569)
> ... 48 elided
> {code}
> while the following executes fine:
> {code}
> scala> sql("describe table x").explain
> INFO SparkSqlParser: Parsing command: describe table x
> org.apache.spark.sql.catalyst.parser.ParseException:
> Unsupported SQL statement
> == SQL ==
> describe table x
> at
> org.apache.spark.sql.catalyst.parser.AbstractSqlParser$$anonfun$parsePlan$1.apply(ParseDriver.scala:58)
> at
> org.apache.spark.sql.catalyst.parser.AbstractSqlParser$$anonfun$parsePlan$1.apply(ParseDriver.scala:53)
> at
> org.apache.spark.sql.catalyst.parser.AbstractSqlParser.parse(ParseDriver.scala:82)
> at
> org.apache.spark.sql.execution.SparkSqlParser.parse(SparkSqlParser.scala:45)
> at
> org.apache.spark.sql.catalyst.parser.AbstractSqlParser.parsePlan(ParseDriver.scala:53)
> at org.apache.spark.sql.SparkSession.sql(SparkSession.scala:569)
> ... 48 elided
> {code}
> I think it's related to the condition in
> https://github.com/apache/spark/blob/master/sql/core/src/main/scala/org/apache/spark/sql/execution/SparkSqlParser.scala#L262.
> If guided I'd like to work on it.
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