[jira] [Assigned] (SPARK-25363) Schema pruning doesn't work if nested column is used in where clause

["DB Tsai (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/SPARK-25363?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

DB Tsai reassigned SPARK-25363:
-------------------------------

    Assignee: Liang-Chi Hsieh

> Schema pruning doesn't work if nested column is used in where clause
> --------------------------------------------------------------------
>
>                 Key: SPARK-25363
>                 URL: https://issues.apache.org/jira/browse/SPARK-25363
>             Project: Spark
>          Issue Type: Bug
>          Components: SQL
>    Affects Versions: 2.4.0
>            Reporter: Liang-Chi Hsieh
>            Assignee: Liang-Chi Hsieh
>            Priority: Major
>
> Schema pruning doesn't work if nested column is used in where clause.
> For example,
> {code}
> sql("select name.first from contacts where name.first = 'David'")
> == Physical Plan ==
> *(1) Project [name#19.first AS first#40]
> +- *(1) Filter (isnotnull(name#19) && (name#19.first = David))
>    +- *(1) FileScan parquet [name#19] Batched: false, Format: Parquet, PartitionFilters: [], 
>     PushedFilters: [IsNotNull(name)], ReadSchema: struct<name:struct<first:string,middle:string,last:string>>
> {code}
> In above query plan, the scan node reads the entire schema of `name` column.
> This issue is reported by:
> https://github.com/apache/spark/pull/21320#issuecomment-419290197



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