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https://issues.apache.org/jira/browse/SPARK-22393?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16265394#comment-16265394
]
Mark Petruska commented on SPARK-22393:
---------------------------------------
Proof for the above statement:
Tracing the import handler generated by `import java.util.UUID` yields
{code}
MemberHandlers$ImportHandler (refs: java)
expr: java.util
selectors: List(ImportSelector(UUID,17,UUID,17))
targetType: <noprefix>
importsWildcard: false
implicitSymbols: List()
importedSymbols: List()
importString: import java.util.UUID
{code}
(also in `scala.tools.nsc.interpreter.MemberHandlers.ImportHandler` (excerpt):
{code}
def importedSymbols = individualSymbols ++ wildcardSymbols
...
/** Complete list of names imported by a wildcard */
lazy val wildcardNames: List[Name] = wildcardSymbols map (_.name)
lazy val individualNames: List[Name] = individualSymbols map (_.name)
/** The names imported by this statement */
override lazy val importedNames: List[Name] = wildcardNames ++ individualNames
{code}
)
and the source code of `scala.tools.nsc.interpreter.Imports.importsCode`
(excerpt):
{code}
// Single symbol imports might be implicits! See bug #1752. Rather than
// try to finesse this, we will mimic all imports for now.
def keepHandler(handler: MemberHandler) = handler match {
// While defining classes in class based mode - implicits are not needed.
case h: ImportHandler if isClassBased && definesClass =>
h.importedNames.exists(x => wanted.contains(x))
case _: ImportHandler => true
case x if generousImports => x.definesImplicit || (x.definedNames exists (d
=> wanted.exists(w => d.startsWith(w))))
case x => x.definesImplicit || (x.definedNames exists
wanted)
}
{code}
> spark-shell can't find imported types in class constructors, extends clause
> ---------------------------------------------------------------------------
>
> Key: SPARK-22393
> URL: https://issues.apache.org/jira/browse/SPARK-22393
> Project: Spark
> Issue Type: Bug
> Components: Spark Shell
> Affects Versions: 2.0.2, 2.1.2, 2.2.0
> Reporter: Ryan Williams
> Priority: Minor
>
> {code}
> $ spark-shell
> …
> scala> import org.apache.spark.Partition
> import org.apache.spark.Partition
> scala> class P(p: Partition)
> <console>:11: error: not found: type Partition
> class P(p: Partition)
> ^
> scala> class P(val index: Int) extends Partition
> <console>:11: error: not found: type Partition
> class P(val index: Int) extends Partition
> ^
> {code}
> Any class that I {{import}} gives "not found: type ___" when used as a
> parameter to a class, or in an extends clause; this applies to classes I
> import from JARs I provide via {{--jars}} as well as core Spark classes as
> above.
> This worked in 1.6.3 but has been broken since 2.0.0.
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