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Posted to issues@spark.apache.org by "Apache Spark (JIRA)" <ji...@apache.org> on 2019/05/14 09:55:00 UTC
[jira] [Assigned] (SPARK-27699) Partially push down disjunctive
predicated in Parquet/ORC
[ https://issues.apache.org/jira/browse/SPARK-27699?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Apache Spark reassigned SPARK-27699:
------------------------------------
Assignee: Apache Spark
> Partially push down disjunctive predicated in Parquet/ORC
> ---------------------------------------------------------
>
> Key: SPARK-27699
> URL: https://issues.apache.org/jira/browse/SPARK-27699
> Project: Spark
> Issue Type: Improvement
> Components: SQL
> Affects Versions: 3.0.0
> Reporter: Gengliang Wang
> Assignee: Apache Spark
> Priority: Major
>
> Currently, in `ParquetFilters` and `OrcFilters`, if the child predicate of `Or` operator can't be entirely pushed down, the predicates will be thrown away.
> In fact, the conjunctive predicates under `Or` operators can be partially pushed down.
> For example, says `a` and `b` are convertible, 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)`.
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