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https://issues.apache.org/jira/browse/SPARK-14536?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15514129#comment-15514129
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Suresh Thalamati commented on SPARK-14536:
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[~sowen] I am not sure why this issue got closed as duplicate after I
reopened. Based on the test case I tried on the master , this issue does not
looks like a duplicate to me; as I mentioned in my previous comment when i
reopened the issue. array data type is supported for postgres.
Repro :
On postgresdb :
create table spark_array(a int , b text[])
insert into spark_array values(1 , null)
insert into spark_array values(1 , '{"AA", "BB"}')
val psqlProps = new java.util.Properties()
psqlProps.setProperty("user" , "user")
psqlProps.setProperty("password" , "password")
-- works fine
spark.read.jdbc("jdbc:postgresql://localhost:5432/pdb", "(select * from
spark_array where b is not null) as a ", psqlProps).show()
-- fails with error.
spark.read.jdbc("jdbc:postgresql://localhost:5432/pdb", "spark_array",
psqlProps).show() fails with following error:
Stack :
16/09/21 11:49:41 WARN TaskSetManager: Lost task 0.0 in stage 0.0 (TID 0,
localhost): java.lang.NullPointerException
at
org.apache.spark.sql.execution.datasources.jdbc.JdbcUtils$$anonfun$org$apache$spark$sql$execution$datasources$jdbc$JdbcUtils$$makeGetter$13.apply(JdbcUtils.scala:442)
at
org.apache.spark.sql.execution.datasources.jdbc.JdbcUtils$$anonfun$org$apache$spark$sql$execution$datasources$jdbc$JdbcUtils$$makeGetter$13.apply(JdbcUtils.scala:440)
at
org.apache.spark.sql.execution.datasources.jdbc.JdbcUtils$$anon$1.getNext(JdbcUtils.scala:301)
at
org.apache.spark.sql.execution.datasources.jdbc.JdbcUtils$$anon$1.getNext(JdbcUtils.scala:283)
at org.apache.spark.util.NextIterator.hasNext(NextIterator.scala:73)
at
org.apache.spark.util.CompletionIterator.hasNext(CompletionIterator.scala:32)
at
org.apache.spark.sql.catalyst.expressions.GeneratedClass$GeneratedIterator.processNext(Unknown
Source)
at
org.apache.spark.sql.execution.BufferedRowIterator.hasNext(BufferedRowIterator.java:43)
> 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
> Labels: NullPointerException
>
> 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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