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Posted to issues@spark.apache.org by "Apache Spark (Jira)" <ji...@apache.org> on 2021/10/12 18:05:00 UTC
[jira] [Assigned] (SPARK-36978) InferConstraints rule should create
IsNotNull constraints on the nested field instead of the root nested type
[ https://issues.apache.org/jira/browse/SPARK-36978?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Apache Spark reassigned SPARK-36978:
------------------------------------
Assignee: Apache Spark
> InferConstraints rule should create IsNotNull constraints on the nested field instead of the root nested type
> --------------------------------------------------------------------------------------------------------------
>
> Key: SPARK-36978
> URL: https://issues.apache.org/jira/browse/SPARK-36978
> Project: Spark
> Issue Type: Improvement
> Components: SQL
> Affects Versions: 3.0.0, 3.1.0, 3.2.0
> Reporter: Utkarsh Agarwal
> Assignee: Apache Spark
> Priority: Major
>
> [InferFiltersFromConstraints|https://github.com/apache/spark/blob/05c0fa573881b49d8ead9a5e16071190e5841e1b/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/optimizer/Optimizer.scala#L1206] optimization rule generates {{IsNotNull}} constraints corresponding to null intolerant predicates. The {{IsNotNull}} constraints are generated on the attribute inside the corresponding predicate.
> e.g. A predicate {{a > 0}} on an integer column {{a}} will result in a constraint {{IsNotNull(a)}}. On the other hand a predicate on a nested int column {{structCol.b}} where {{structCol}} is a struct column results in a constraint {{IsNotNull(structCol)}}.
> This generation of constraints on the root level nested type is extremely conservative as it could lead to materialization of the the entire struct. The constraint should instead be generated on the nested field being referenced by the predicate. In the above example, the constraint should be {{IsNotNull(structCol.b)}} instead of {{IsNotNull(structCol)}}
>
> The new constraints also create opportunities for nested pruning. Currently {{IsNotNull(structCol)}} constraint would preclude pruning of {{structCol}}. However the constraint {{IsNotNull(structCol.b)}} could create opportunities to prune {{structCol}}.
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