[jira] [Assigned] (SPARK-31919) Push down more predicates through Join

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

     [ https://issues.apache.org/jira/browse/SPARK-31919?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Apache Spark reassigned SPARK-31919:
------------------------------------

    Assignee: Apache Spark  (was: Gengliang Wang)

> Push down more predicates through Join
> --------------------------------------
>
>                 Key: SPARK-31919
>                 URL: https://issues.apache.org/jira/browse/SPARK-31919
>             Project: Spark
>          Issue Type: Improvement
>          Components: SQL
>    Affects Versions: 3.1.0
>            Reporter: Gengliang Wang
>            Assignee: Apache Spark
>            Priority: Major
>
> Currently, in `PushPredicateThroughJoin`, if the condition predicate of `Or` operator can't be entirely pushed down, it will be thrown away. 
> In fact, the predicates under `Or` operators can be partially pushed down.
> For example, says `a` and `b` are able to be pushed into one of the joined tables, while `c` can't be pushed down, the predicate
> `a or (b and c)` 
> can be converted as 
> `(a or b) and (a or c)`
> We can still push down `(a or b)`.
> We can't push down disjunctive predicates only when one of its children is not partially convertible.



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