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https://issues.apache.org/jira/browse/SPARK-9691?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14660414#comment-14660414
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Joseph K. Bradley commented on SPARK-9691:
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This also affects some other methods taking seeds (randn)
> PySpark SQL rand function treats seed 0 as no seed
> --------------------------------------------------
>
> Key: SPARK-9691
> URL: https://issues.apache.org/jira/browse/SPARK-9691
> Project: Spark
> Issue Type: Bug
> Components: PySpark, SQL
> Affects Versions: 1.4.0, 1.4.1, 1.4.2, 1.5.0
> Reporter: Joseph K. Bradley
>
> In PySpark SQL's rand() function, it tests for a seed in a way such that seed
> 0 is treated as no seed, leading to non-deterministic results when a user
> would expect deterministic results.
> See:
> [https://github.com/apache/spark/blob/98e69467d4fda2c26a951409b5b7c6f1e9345ce4/python/pyspark/sql/functions.py#L271]
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