Jeremy Smith created SPARK-14536:
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Summary: NPE in JDBCRDD when array column contains nulls
(postgresql)
Key: SPARK-14536
URL: https://issues.apache.org/jira/browse/SPARK-14536
Project: Spark
Issue Type: Bug
Components: SQL
Affects Versions: 1.6.1
Reporter: Jeremy Smith
At
https://github.com/apache/spark/blob/master/sql/core/src/main/scala/org/apache/spark/sql/execution/datasources/jdbc/JDBCRDD.scala#L453
it is assumed that the JDBC driver will definitely return a non-null `Array`
object from the call to `getArray`, and that in the event of a null array it
will return an non-null `Array` object with a null underlying array. But as
you can see here
https://github.com/pgjdbc/pgjdbc/blob/master/pgjdbc/src/main/java/org/postgresql/jdbc/PgResultSet.java#L387
that isn't the case, at least for PostgreSQL. This causes a
`NullPointerException` whenever an array column contains null values. It seems
like the PostgreSQL JDBC driver is probably doing the wrong thing, but even so
there should be a null check in JDBCRDD. I'm happy to submit a PR if that
would be helpful.
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