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https://issues.apache.org/jira/browse/SPARK-17735?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15534046#comment-15534046
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Saif Addin Ellafi commented on SPARK-17735:
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Hello, thanks
I needed to know not only if hive tables were temporary, but also if they were
or not in Cache. Final format is a dataframe just to show results as a table
later on.
I can think of alternative ways, not changing any state specifically inside the
udf.
> Cannot call sqlContext inside udf
> ---------------------------------
>
> Key: SPARK-17735
> URL: https://issues.apache.org/jira/browse/SPARK-17735
> Project: Spark
> Issue Type: Bug
> Components: Spark Core, SQL
> Affects Versions: 1.6.0
> Environment: Linux
> Reporter: Saif Addin Ellafi
> Priority: Minor
>
> Hello, I know it is a strange use case but I just wanted to append is cache
> to hive tables and turned out into this
> {noformat}
> def inCacheUdf = org.apache.spark.sql.functions.udf {name: String =>
> sqlContext.isCached(name)}
> val ts = sqlContext.tables
> ts.withColumn("foo", inCacheUdf(ts.col("tableName"))).show
> {noformat}
> .. will throw a Null Pointer Exception.
> I am not sure, since in my program I was getting:
> A master url must be set in your configuration
> or NullPointer at getConf as well.
> Thoughts?
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