Peng-Lei commented on pull request #33339:
URL: https://github.com/apache/spark/pull/33339#issuecomment-908831779
> > it will throw the exception.
>
> which exception does it throw? and what's the stacktrace?
The testcase:
```scala
withNamespace("testcat.testcat") {
sql("CREATE NAMESPACE IF NOT EXISTS testcat.testcat COMMENT " +
"'test namespace' LOCATION '/tmp/ns_test'")
sql("use testcat")
val descriptionDf = sql("DESCRIBE NAMESPACE testcat")
...
}
```
The stacktrace:
```scala
next on empty iterator
java.util.NoSuchElementException: next on empty iterator
at scala.collection.Iterator$$anon$2.next(Iterator.scala:41)
at scala.collection.Iterator$$anon$2.next(Iterator.scala:39)
at scala.collection.IterableLike.head(IterableLike.scala:109)
at scala.collection.IterableLike.head$(IterableLike.scala:108)
at
scala.collection.mutable.ArrayOps$ofRef.scala$collection$IndexedSeqOptimized$$super$head(ArrayOps.scala:198)
at
scala.collection.IndexedSeqOptimized.head(IndexedSeqOptimized.scala:129)
at
scala.collection.IndexedSeqOptimized.head$(IndexedSeqOptimized.scala:129)
at scala.collection.mutable.ArrayOps$ofRef.head(ArrayOps.scala:198)
at scala.collection.TraversableLike.last(TraversableLike.scala:627)
at scala.collection.TraversableLike.last$(TraversableLike.scala:626)
at
scala.collection.mutable.ArrayOps$ofRef.scala$collection$IndexedSeqOptimized$$super$last(ArrayOps.scala:198)
at
scala.collection.IndexedSeqOptimized.last(IndexedSeqOptimized.scala:135)
at
scala.collection.IndexedSeqOptimized.last$(IndexedSeqOptimized.scala:135)
at scala.collection.mutable.ArrayOps$ofRef.last(ArrayOps.scala:198)
at
org.apache.spark.sql.execution.datasources.v2.DescribeNamespaceExec.run(DescribeNamespaceExec.scala:40)
at
org.apache.spark.sql.execution.datasources.v2.V2CommandExec.result$lzycompute(V2CommandExec.scala:43)
at
org.apache.spark.sql.execution.datasources.v2.V2CommandExec.result(V2CommandExec.scala:43)
at
org.apache.spark.sql.execution.datasources.v2.V2CommandExec.executeCollect(V2CommandExec.scala:49)
at
org.apache.spark.sql.execution.QueryExecution$$anonfun$eagerlyExecuteCommands$1.$anonfun$applyOrElse$1(QueryExecution.scala:110)
at
org.apache.spark.sql.execution.SQLExecution$.$anonfun$withNewExecutionId$5(SQLExecution.scala:103)
at
org.apache.spark.sql.execution.SQLExecution$.withSQLConfPropagated(SQLExecution.scala:163)
at
org.apache.spark.sql.execution.SQLExecution$.$anonfun$withNewExecutionId$1(SQLExecution.scala:90)
at org.apache.spark.sql.SparkSession.withActive(SparkSession.scala:775)
...
```
The `testcat` is a catalog of
`org.apache.spark.sql.connector.catalog.InMemoryCatalog` in test package.
main cause:
when resolve Namespace the Object of `CatalogAndNamespace`
```scala
try {
Some((catalogManager.catalog(nameParts.head), nameParts.tail)) //
nameParts.head == "catalog" , nameParts.tail == null
} catch {
case _: CatalogNotFoundException =>
Some((currentCatalog, nameParts))
}
```
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