Jacek Laskowski created SPARK-17328:
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Summary: 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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