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Posted to issues@spark.apache.org by "Apache Spark (Jira)" <ji...@apache.org> on 2021/04/06 12:59:00 UTC
[jira] [Commented] (SPARK-34966) Avoid shuffle if join type do not
match
[ https://issues.apache.org/jira/browse/SPARK-34966?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17315514#comment-17315514 ]
Apache Spark commented on SPARK-34966:
--------------------------------------
User 'wangyum' has created a pull request for this issue:
https://github.com/apache/spark/pull/32063
> Avoid shuffle if join type do not match
> ---------------------------------------
>
> Key: SPARK-34966
> URL: https://issues.apache.org/jira/browse/SPARK-34966
> Project: Spark
> Issue Type: Improvement
> Components: SQL
> Affects Versions: 3.2.0
> Reporter: Yuming Wang
> Priority: Major
>
> How to reproduce this issue:
> {code:scala}
> spark.sql("set spark.sql.autoBroadcastJoinThreshold=-1")
> spark.sql("CREATE TABLE t1 using parquet clustered by (id) into 200 buckets AS SELECT cast(id as bigint) FROM range(1000)")
> spark.sql("CREATE TABLE t2 using parquet clustered by (id) into 200 buckets AS SELECT cast(id as int) FROM range(500)")
> spark.sql("select * from t1 join t2 on (t1.id = t2.id)").explain
> {code}
> Current:
> {noformat}
> == Physical Plan ==
> AdaptiveSparkPlan isFinalPlan=false
> +- SortMergeJoin [id#14L], [cast(id#15 as bigint)], Inner
> :- Sort [id#14L ASC NULLS FIRST], false, 0
> : +- Filter isnotnull(id#14L)
> : +- FileScan parquet default.t1[id#14L] Batched: true, DataFilters: [isnotnull(id#14L)], Format: Parquet, Location: InMemoryFileIndex(1 paths)[file:/Users/yumwang/opensource/spark/spark-warehouse/org.apache.spark...., PartitionFilters: [], PushedFilters: [IsNotNull(id)], ReadSchema: struct<id:bigint>, SelectedBucketsCount: 200 out of 200
> +- Sort [cast(id#15 as bigint) ASC NULLS FIRST], false, 0
> +- Exchange hashpartitioning(cast(id#15 as bigint), 200), ENSURE_REQUIREMENTS, [id=#58]
> +- Filter isnotnull(id#15)
> +- FileScan parquet default.t2[id#15] Batched: true, DataFilters: [isnotnull(id#15)], Format: Parquet, Location: InMemoryFileIndex(1 paths)[file:/Users/yumwang/opensource/spark/spark-warehouse/org.apache.spark...., PartitionFilters: [], PushedFilters: [IsNotNull(id)], ReadSchema: struct<id:int>
> {noformat}
> Expected:
> {noformat}
> == Physical Plan ==
> AdaptiveSparkPlan isFinalPlan=false
> +- SortMergeJoin [id#14L], [cast(id#15 as bigint)], Inner
> :- Sort [id#14L ASC NULLS FIRST], false, 0
> : +- Filter isnotnull(id#14L)
> : +- FileScan parquet default.t1[id#14L] Batched: true, DataFilters: [isnotnull(id#14L)], Format: Parquet, Location: InMemoryFileIndex(1 paths)[file:/Users/yumwang/opensource/spark/spark-warehouse/org.apache.spark...., PartitionFilters: [], PushedFilters: [IsNotNull(id)], ReadSchema: struct<id:bigint>, SelectedBucketsCount: 200 out of 200
> +- Sort [cast(id#15 as bigint) ASC NULLS FIRST], false, 0
> +- Filter isnotnull(id#15)
> +- FileScan parquet default.t2[id#15] Batched: true, DataFilters: [isnotnull(id#15)], Format: Parquet, Location: InMemoryFileIndex(1 paths)[file:/Users/yumwang/opensource/spark/spark-warehouse/org.apache.spark...., PartitionFilters: [], PushedFilters: [IsNotNull(id)], ReadSchema: struct<id:int>, SelectedBucketsCount: 200 out of 200
> {noformat}
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