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Posted to issues@spark.apache.org by "Jackey Lee (Jira)" <ji...@apache.org> on 2019/11/26 05:08:00 UTC
[jira] [Created] (SPARK-30036) REPARTITION hint dose not work with
order by
Jackey Lee created SPARK-30036:
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Summary: REPARTITION hint dose not work with order by
Key: SPARK-30036
URL: https://issues.apache.org/jira/browse/SPARK-30036
Project: Spark
Issue Type: Bug
Components: SQL
Affects Versions: 3.0.0
Reporter: Jackey Lee
Example SQL: select /*+ REPARTITION(2) */ * from test order by a
== Physical Plan ==
*(1) Sort [a#0 ASC NULLS FIRST], true, 0
+- Exchange rangepartitioning(a#0 ASC NULLS FIRST, 2), true, [id=#11]
+- Exchange RoundRobinPartitioning(3)
+- Scan hive default.test [a#0, b#1], HiveTableRelation `default`.`test`, org.apache.hadoop.hive.serde2.lazy.LazySimpleSerDe, [a#0, b#1|#0, b#1]
EnsureRequirements adds ShuffleExchangeExec (RangePartitioning) after Sort if RoundRobinPartitioning behinds it. This will cause 2 shuffles, and the number of partitions in the final stage is not the number specified by RoundRobinPartitioning.
This patch will add a new rule to change RoundRobinPartitioning to RangePartitioning rather than add new ShuffleExchangeExec.
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