[jira] [Assigned] (SPARK-35118) Propagate empty relation through Join if join condition is empty

["Apache Spark (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/SPARK-35118?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Apache Spark reassigned SPARK-35118:
------------------------------------

    Assignee:     (was: Apache Spark)

> Propagate empty relation through Join if join condition is empty
> ----------------------------------------------------------------
>
>                 Key: SPARK-35118
>                 URL: https://issues.apache.org/jira/browse/SPARK-35118
>             Project: Spark
>          Issue Type: Improvement
>          Components: SQL
>    Affects Versions: 3.2.0
>            Reporter: Yuming Wang
>            Priority: Major
>
> {code:scala}
> spark.sql("create table t1 using parquet as select id as a, id as b from range(10)")
> spark.sql("create table t2 using parquet as select id as a, id as b from range(20)")
> spark.sql("select t1.a from t1 left semi join t2").explain(true)
> {code}
> Current plan:
> {noformat}
> == Optimized Logical Plan ==
> Join LeftSemi
> :- Project [a#6L]
> :  +- Relation default.t1[a#6L,b#7L] parquet
> +- Project
>    +- Relation default.t2[a#8L,b#9L] parquet
> {noformat}
> Excepted plan:
> {noformat}
> == Optimized Logical Plan ==
> Project [a#6L]
> +- Relation default.t1[a#6L,b#7L] parquet
> {noformat}



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