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Posted to issues@spark.apache.org by "Xiangrui Meng (JIRA)" <ji...@apache.org> on 2016/11/09 19:44:58 UTC
[jira] [Commented] (SPARK-18390) Optimized plan tried to use
Cartesian join when it is not enabled
[ https://issues.apache.org/jira/browse/SPARK-18390?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15651859#comment-15651859 ]
Xiangrui Meng commented on SPARK-18390:
---------------------------------------
cc: [~yhuai] [~lian cheng]
> Optimized plan tried to use Cartesian join when it is not enabled
> -----------------------------------------------------------------
>
> Key: SPARK-18390
> URL: https://issues.apache.org/jira/browse/SPARK-18390
> Project: Spark
> Issue Type: Improvement
> Components: SQL
> Affects Versions: 2.0.1
> Reporter: Xiangrui Meng
>
> {code}
> val df2 = spark.range(1e9.toInt).withColumn("one", lit(1))
> val df3 = spark.range(1e9.toInt)
> df3.join(df2, df3("id") === df2("one")).count()
> {code}
> throws
> {noformat}
> org.apache.spark.sql.AnalysisException: Cartesian joins could be prohibitively expensive and are disabled by default. To explicitly enable them, please set spark.sql.crossJoin.enabled = true;
> {noformat}
> This is probably not the right behavior because it was not the user who suggested using cartesian product. SQL picked it while knowing it is not enabled.
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