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https://issues.apache.org/jira/browse/SPARK-59905?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Peter Toth updated SPARK-59905:
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Fix Version/s: 4.1.4
> Storage-partitioned join sorts partitions the wrong way for an ORDER BY over
> a join-key expression
> --------------------------------------------------------------------------------------------------
>
> Key: SPARK-59905
> URL: https://issues.apache.org/jira/browse/SPARK-59905
> Project: Spark
> Issue Type: Bug
> Components: SQL
> Affects Versions: 4.2.0, 4.1.3, 4.0.4
> Reporter: Peter Toth
> Assignee: Peter Toth
> Priority: Major
> Labels: correctness, pull-request-available
> Fix For: 4.3.0, 4.2.1, 4.1.4, 4.4.0
>
>
> With spark.sql.sources.v2.bucketing.shuffle.enabled and
> spark.sql.sources.v2.bucketing.sorting.enabled on, this query returns its
> rows in reverse order. {{ident}} is identity-partitioned on {{id}} and holds
> 94 to 100, and {{plain(b)}} holds 0 to 6:
> {code:sql}
> SELECT p.b FROM ident i JOIN plain p ON i.id = 100 - p.b ORDER BY 100 - p.b
> {code}
> It returns 0, 1, ..., 6 instead of 6, 5, ..., 0.
> The join shuffles {{plain}} onto {{ident}}'s layout, so
> {{KeyedShuffleSpec.createPartitioning}} reports the bare join key {{100 - b}}
> as {{plain}}'s partition expression. Its key rows then already hold {{100 -
> b}}. When {{EnsureRequirements}} checks the keyed child against the
> {{OrderedDistribution}}, it binds the required ordering to
> {{expressions.flatMap(_.references)}}, which is {{b}}. So it computes {{100 -
> (100 - b)}} on the key rows and orders the partitions the wrong way. The
> global sort is removed all the same.
> The same binding also fails planning for a join key over two columns. With
> {{ident}} holding 0 to 7 and {{plain2(b, c)}} holding (0, 1), (0, 2), (1, 1)
> and (1, 2):
> {code:sql}
> SELECT * FROM ident i JOIN plain2 p ON i.id = p.b + p.c ORDER BY p.b + p.c
> {code}
> It fails with {{ArrayIndexOutOfBoundsException: Index 1 out of bounds for
> length 1}}. The partition expression is {{b + c}}, so binding the ordering to
> its references gives two attributes for a key row with one value.
> Reported by dongjoon-hyun in the review of
> https://github.com/apache/spark/pull/59165.
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