NullPointerException is thrown when column with ROWID type contains NULL values

A row ID may be NULL in an Oracle table. When this is the case, the following exception is thrown:

[info] Cause: java.lang.NullPointerException:
[info] at org.apache.spark.sql.execution.datasources.jdbc.JdbcUtils$.$anonfun$makeGetter$12(JdbcUtils.scala:452)[info] at org.apache.spark.sql.execution.datasources.jdbc.JdbcUtils$.$anonfun$makeGetter$12$adapted(JdbcUtils.scala:451)
[info] at org.apache.spark.sql.execution.datasources.jdbc.JdbcUtils$$anon$1.getNext(JdbcUtils.scala:361)[info] at org.apache.spark.sql.execution.datasources.jdbc.JdbcUtils$$anon$1.getNext(JdbcUtils.scala:343)