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https://issues.apache.org/jira/browse/SPARK-47633?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Dongjoon Hyun closed SPARK-47633.
---------------------------------
> Cache miss for queries using JOIN LATERAL with join condition
> -------------------------------------------------------------
>
> Key: SPARK-47633
> URL: https://issues.apache.org/jira/browse/SPARK-47633
> Project: Spark
> Issue Type: Bug
> Components: SQL
> Affects Versions: 3.4.2, 3.5.1, 4.0.0
> Reporter: Bruce Robbins
> Assignee: Bruce Robbins
> Priority: Major
> Labels: pull-request-available
> Fix For: 3.5.2
>
>
> For example:
> {noformat}
> CREATE or REPLACE TEMP VIEW t1(c1, c2) AS VALUES (0, 1), (1, 2);
> CREATE or REPLACE TEMP VIEW t2(c1, c2) AS VALUES (0, 1), (1, 2);
> create or replace temp view v1 as
> select *
> from t1
> join lateral (
> select c1 as a, c2 as b
> from t2)
> on c1 = a;
> cache table v1;
> explain select * from v1;
> == Physical Plan ==
> AdaptiveSparkPlan isFinalPlan=false
> +- BroadcastHashJoin [c1#180], [a#173], Inner, BuildRight, false
> :- LocalTableScan [c1#180, c2#181]
> +- BroadcastExchange HashedRelationBroadcastMode(List(cast(input[0, int,
> false] as bigint)),false), [plan_id=113]
> +- LocalTableScan [a#173, b#174]
> {noformat}
> Note that there is no {{InMemoryRelation}}.
> However, if you move the join condition into the subquery, the cached plan is
> used:
> {noformat}
> CREATE or REPLACE TEMP VIEW t1(c1, c2) AS VALUES (0, 1), (1, 2);
> CREATE or REPLACE TEMP VIEW t2(c1, c2) AS VALUES (0, 1), (1, 2);
> create or replace temp view v2 as
> select *
> from t1
> join lateral (
> select c1 as a, c2 as b
> from t2
> where t1.c1 = t2.c1);
> cache table v2;
> explain select * from v2;
> == Physical Plan ==
> AdaptiveSparkPlan isFinalPlan=false
> +- Scan In-memory table v2 [c1#176, c2#177, a#178, b#179]
> +- InMemoryRelation [c1#176, c2#177, a#178, b#179], StorageLevel(disk,
> memory, deserialized, 1 replicas)
> +- AdaptiveSparkPlan isFinalPlan=true
> +- == Final Plan ==
> *(1) Project [c1#26, c2#27, a#19, b#20]
> +- *(1) BroadcastHashJoin [c1#26], [c1#30], Inner,
> BuildLeft, false
> :- BroadcastQueryStage 0
> : +- BroadcastExchange
> HashedRelationBroadcastMode(List(cast(input[0, int, false] as
> bigint)),false), [plan_id=37]
> : +- LocalTableScan [c1#26, c2#27]
> +- *(1) LocalTableScan [a#19, b#20, c1#30]
> +- == Initial Plan ==
> Project [c1#26, c2#27, a#19, b#20]
> +- BroadcastHashJoin [c1#26], [c1#30], Inner, BuildLeft,
> false
> :- BroadcastExchange
> HashedRelationBroadcastMode(List(cast(input[0, int, false] as
> bigint)),false), [plan_id=37]
> : +- LocalTableScan [c1#26, c2#27]
> +- LocalTableScan [a#19, b#20, c1#30]
> {noformat}
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