Nicholas Chammas created SPARK-25150: ----------------------------------------
Summary: Joining DataFrames derived from the same source yields confusing/incorrect results Key: SPARK-25150 URL: https://issues.apache.org/jira/browse/SPARK-25150 Project: Spark Issue Type: Bug Components: SQL Affects Versions: 2.3.1 Reporter: Nicholas Chammas Attachments: output-with-implicit-cross-join.txt, output-without-implicit-cross-join.txt, persons.csv, states.csv, zombie-analysis.py I have two DataFrames, A and B. From B, I have derived two additional DataFrames, B1 and B2. When joining A to B1 and B2, I'm getting a very confusing error: {code:java} Join condition is missing or trivial. Either: use the CROSS JOIN syntax to allow cartesian products between these relations, or: enable implicit cartesian products by setting the configuration variable spark.sql.crossJoin.enabled=true; {code} Then, when IĀ configure "spark.sql.crossJoin.enabled=true" as instructed, Spark appears to give me incorrect answers. I am not sure if I am missing something obvious, or if there is some kind of bug here. The "join condition is missing" error is confusing and doesn't make sense to me, and the seemingly incorrect output is concerning. I've attached a reproduction, along with the output I'm seeing with and without the implicit cross join enabled. I realize the join I've written is not correct in the sense that it should be left outer join instead of an inner join (since some of the aggregates are not available for all states), but that doesn't explain Spark's behavior. -- This message was sent by Atlassian JIRA (v7.6.3#76005) --------------------------------------------------------------------- To unsubscribe, e-mail: issues-unsubscr...@spark.apache.org For additional commands, e-mail: issues-h...@spark.apache.org