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https://issues.apache.org/jira/browse/SPARK-25961?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16680925#comment-16680925
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Hyukjin Kwon commented on SPARK-25961:
--------------------------------------
Questions should go to mailing list. That seems to be intentionally disallowed
because of non-deterministic behaviour.
> Random numbers are not supported when handling data skew
> --------------------------------------------------------
>
> Key: SPARK-25961
> URL: https://issues.apache.org/jira/browse/SPARK-25961
> Project: Spark
> Issue Type: Bug
> Components: SQL
> Affects Versions: 2.3.1
> Environment: spark on yarn 2.3.1
> Reporter: zengxl
> Priority: Major
>
> My SQL query uses two tables to join. One table join key has null value. I
> use random value instead of {{null}};however, it has error. The error as
> follows:
> {code}
> Error in query: nondeterministic expressions are only allowed in
> Project, Filter, Aggregate or Window, found
> scan spark source code is
> org.apache.spark.sql.catalyst.analysis.CheckAnalysis check sql, because the
> number of random variables is uncertain, it is prohibited
> {code}
> {code}
> case o if o.expressions.exists(!_.deterministic) &&
> !o.isInstanceOf[Project] && !o.isInstanceOf[Filter] &&
> !o.isInstanceOf[Aggregate] && !o.isInstanceOf[Window] =>
> // The rule above is used to check Aggregate operator.
> failAnalysis(
> s"""nondeterministic expressions are only allowed in
> |Project, Filter, Aggregate or Window, found:|
> |${o.expressions.map(_.sql).mkString(",")}|
> |in operator ${operator.simpleString}
> """.stripMargin)|
> {code}
>
> Is it possible to add Join to this code? It's not yet tested.And whether
> there will be other effects
> {code}
> case o if o.expressions.exists(!_.deterministic) &&
> !o.isInstanceOf[Project] && !o.isInstanceOf[Filter] &&
> !o.isInstanceOf[Aggregate] && !o.isInstanceOf[Window] +{color:#d04437}&&
> !o.isInstanceOf[Join]{color}+ =>
> // The rule above is used to check Aggregate operator.
> failAnalysis(
> s"""nondeterministic expressions are only allowed in
> |Project, Filter, Aggregate or Window or Join, found:|
> |${o.expressions.map(_.sql).mkString(",")}|
> |in operator ${operator.simpleString}
> """.stripMargin)|
> {code}
> This is my SQL query is as below:
> {code}
> SELECT T1.CUST_NO AS CUST_NO,
> T3.CON_LAST_NAME AS CUST_NAME,
> T3.CON_SEX_MF AS SEX_CODE,
> T3.X_POSITION AS POST_LV_CODE
> FROM tmp.ICT_CUST_RANGE_INFO T1
> LEFT JOIN tmp.F_CUST_BASE_INFO_ALL T3 ON CASE
> WHEN coalesce(T1.CUST_NO, '')
> ='' THEN concat('cust_no', RAND())
> ELSE T1.CUST_NO
> END = T3.BECIF
> AND T3.DATE='20181105'
> WHERE T1.DATE='20181105'
> {code}
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