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Posted to issues@spark.apache.org by "Wan Kun (Jira)" <ji...@apache.org> on 2021/08/11 14:55:00 UTC
[jira] [Updated] (SPARK-36478) Removes outer join if all grouping
and aggregate expressions are from the streamed side
[ https://issues.apache.org/jira/browse/SPARK-36478?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Wan Kun updated SPARK-36478:
----------------------------
Description:
Removes outer join if all grouping and aggregate expressions are from the streamed side.
For example:
{code:java}
spark.range(200L).selectExpr("id AS a", "id as b", "id as c").createTempView("t1")
spark.range(300L).selectExpr("id AS a", "id as b", "id as c").createTempView("t2")
spark.sql("SELECT t1.b, max(t1.c) as c FROM t1 LEFT JOIN t2 ON t1.a = t2.a GROUP BY t1.b").explain(true)
{code}
Current optimized plan:
{code:java}
== Optimized Logical Plan ==
Aggregate [b#3L], [b#3L, max(c#4L) AS c#20L]
+- Project [b#3L, c#4L]
+- Join LeftOuter, (a#2L = a#10L)
:- Project [id#0L AS a#2L, id#0L AS b#3L, id#0L AS c#4L]
: +- Range (0, 200, step=1, splits=Some(1))
+- Project [id#8L AS a#10L]
+- Range (0, 300, step=1, splits=Some(1))
{code}
Expected optimized plan:
{code:java}
== Optimized Logical Plan ==
Aggregate [b#277L], [b#277L, max(c#278L) AS c#290L]
+- Project [id#274L AS b#277L, id#274L AS c#278L]
+- Range (0, 200, step=1, splits=Some(2))
{code}
was:
Removes outer join if all grouping and aggregate expressions are from the streamed side.
For example:
{code:java}
spark.range(200L).selectExpr("id AS a").createTempView("t1")
spark.range(300L).selectExpr("id AS b").createTempView("t2")
spark.sql("SELECT DISTINCT a FROM t1 LEFT JOIN t2 ON a = b").explain(true){code}
Current optimized plan:
{code:java}
== Optimized Logical Plan ==
Aggregate [b#3L], [b#3L, max(c#4L) AS c#20L]
+- Project [b#3L, c#4L]
+- Join LeftOuter, (a#2L = a#10L)
:- Project [id#0L AS a#2L, id#0L AS b#3L, id#0L AS c#4L]
: +- Range (0, 200, step=1, splits=Some(1))
+- Project [id#8L AS a#10L]
+- Range (0, 300, step=1, splits=Some(1))
{code}
Expected optimized plan:
{code:java}
== Optimized Logical Plan ==
Aggregate [b#277L], [b#277L, max(c#278L) AS c#290L]
+- Project [id#274L AS b#277L, id#274L AS c#278L]
+- Range (0, 200, step=1, splits=Some(2))
{code}
> Removes outer join if all grouping and aggregate expressions are from the streamed side
> ---------------------------------------------------------------------------------------
>
> Key: SPARK-36478
> URL: https://issues.apache.org/jira/browse/SPARK-36478
> Project: Spark
> Issue Type: Improvement
> Components: SQL
> Affects Versions: 3.2.0
> Reporter: Wan Kun
> Priority: Minor
>
> Removes outer join if all grouping and aggregate expressions are from the streamed side.
> For example:
> {code:java}
> spark.range(200L).selectExpr("id AS a", "id as b", "id as c").createTempView("t1")
> spark.range(300L).selectExpr("id AS a", "id as b", "id as c").createTempView("t2")
> spark.sql("SELECT t1.b, max(t1.c) as c FROM t1 LEFT JOIN t2 ON t1.a = t2.a GROUP BY t1.b").explain(true)
> {code}
> Current optimized plan:
> {code:java}
> == Optimized Logical Plan ==
> Aggregate [b#3L], [b#3L, max(c#4L) AS c#20L]
> +- Project [b#3L, c#4L]
> +- Join LeftOuter, (a#2L = a#10L)
> :- Project [id#0L AS a#2L, id#0L AS b#3L, id#0L AS c#4L]
> : +- Range (0, 200, step=1, splits=Some(1))
> +- Project [id#8L AS a#10L]
> +- Range (0, 300, step=1, splits=Some(1))
> {code}
> Expected optimized plan:
> {code:java}
> == Optimized Logical Plan ==
> Aggregate [b#277L], [b#277L, max(c#278L) AS c#290L]
> +- Project [id#274L AS b#277L, id#274L AS c#278L]
> +- Range (0, 200, step=1, splits=Some(2))
> {code}
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