[jira] [Commented] (SPARK-18368) Regular expression replace throws NullPointerException when serialized

["Apache Spark (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/SPARK-18368?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15649104#comment-15649104 ] 

Apache Spark commented on SPARK-18368:
--------------------------------------

User 'rdblue' has created a pull request for this issue:
https://github.com/apache/spark/pull/15816

> Regular expression replace throws NullPointerException when serialized
> ----------------------------------------------------------------------
>
>                 Key: SPARK-18368
>                 URL: https://issues.apache.org/jira/browse/SPARK-18368
>             Project: Spark
>          Issue Type: Bug
>          Components: SQL
>    Affects Versions: 2.0.1, 2.1.0
>            Reporter: Ryan Blue
>
> This query fails with a [NullPointerException on line 247|https://github.com/apache/spark/blob/master/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/regexpExpressions.scala#L247]:
> {code}
> SELECT POSEXPLODE(SPLIT(REGEXP_REPLACE(ranks, '[\\[ \\]]', ''), ',')) AS (rank, col0) FROM table;
> {code}
> The problem is that POSEXPLODE is causing the REGEXP_REPLACE to be serialized after it is instantiated. The null value is a transient StringBuffer that should hold the result. The fix is to make the result value lazy.



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