[MINOR] change new Exception to IllegalArgumentException

Author: Daoyuan Wang <daoyuan.wang@intel.com>

Closes #6434 from adrian-wang/joinerr and squashes the following commits:

ee1b64f [Daoyuan Wang] break line
f7c53e9 [Daoyuan Wang] to IllegalArgumentException
f8dea2d [Daoyuan Wang] sys.err to IllegalStateException
be82259 [Daoyuan Wang] change new exception to sys.err

sql/core/src/main/scala/org/apache/spark/sql/execution/joins/HashOuterJoin.scala

@@ -48,7 +48,8 @@ case class HashOuterJoin(
     case LeftOuter => left.outputPartitioning
     case RightOuter => right.outputPartitioning
     case FullOuter => UnknownPartitioning(left.outputPartitioning.numPartitions)
-    case x => throw new Exception(s"HashOuterJoin should not take $x as the JoinType")
+    case x =>
+      throw new IllegalArgumentException(s"HashOuterJoin should not take $x as the JoinType")
   }
 
   override def requiredChildDistribution: Seq[ClusteredDistribution] =
@@ -63,7 +64,7 @@ case class HashOuterJoin(
       case FullOuter =>
         left.output.map(_.withNullability(true)) ++ right.output.map(_.withNullability(true))
       case x =>
-        throw new Exception(s"HashOuterJoin should not take $x as the JoinType")
+        throw new IllegalArgumentException(s"HashOuterJoin should not take $x as the JoinType")
     }
   }
 
@@ -216,7 +217,8 @@ case class HashOuterJoin(
               rightHashTable.getOrElse(key, EMPTY_LIST), joinedRow)
           }
 
-        case x => throw new Exception(s"HashOuterJoin should not take $x as the JoinType")
+        case x =>
+          throw new IllegalArgumentException(s"HashOuterJoin should not take $x as the JoinType")
       }
     }
   }