Create Temporary Function Issue

[ashishkshukla]

We are getting NullPointerException while creating temporary function -

Query-

snSession.sql("CREATE temporary FUNCTION strnglen as com.some_package.StringUDF RETURNS Integer USING JAR '<UDF_JAR_PATH>/string_udf2.jar'")

Output-

java.lang.NullPointerException
  at org.apache.spark.sql.internal.SnappySessionCatalog.loadFunctionResources(SnappySessionCatalog.scala
  at org.apache.spark.sql.execution.command.CreateFunctionCommand.run(functions.scala:59)
  at org.apache.spark.sql.execution.command.ExecutedCommandExec.sideEffectResult$lzycompute(commands.scala:58)
  at org.apache.spark.sql.execution.command.ExecutedCommandExec.sideEffectResult(commands.scala:56)
  at org.apache.spark.sql.execution.command.ExecutedCommandExec.doExecute(commands.scala:74)
  at org.apache.spark.sql.execution.SparkPlan$$anonfun$execute$1.apply(SparkPlan.scala:114)
  at org.apache.spark.sql.execution.SparkPlan$$anonfun$execute$1.apply(SparkPlan.scala:114)
  at org.apache.spark.sql.execution.SparkPlan$$anonfun$executeQuery$1.apply(SparkPlan.scala:135)

I found that issue is coming due to currentFunctionIdentifier initialization in case of temporary functions.

I have found its fix and will raise the pull request for review.