[jira] [Resolved] (SPARK-20938) explain() for datasources implementing CatalystScan does not show pushed predicates correctly

["Hyukjin Kwon (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/SPARK-20938?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Hyukjin Kwon resolved SPARK-20938.
----------------------------------
    Resolution: Incomplete

> explain() for datasources implementing CatalystScan does not show pushed predicates correctly
> ---------------------------------------------------------------------------------------------
>
>                 Key: SPARK-20938
>                 URL: https://issues.apache.org/jira/browse/SPARK-20938
>             Project: Spark
>          Issue Type: Bug
>          Components: SQL
>    Affects Versions: 2.2.0
>            Reporter: Hyukjin Kwon
>            Priority: Minor
>              Labels: bulk-closed
>
> Actual pushed-down catalyst predicate expressions look not being represented correctly (but only sources filters) when we use a datasource implementing {{CatalystScan}}. For example, the below case
> {code}
> df.filter("cast(a as string) == '1' and a < 3").explain()
> {code}
> prints the plan as below:
> {code}
> == Physical Plan ==
> *Filter (cast(a#0L as string) = 1)
> +- *Scan SimpleCatalystScan(0,10) [a#0L] PushedFilters: [*LessThan(a,3)], ReadSchema: struct<a:bigint>
> {code}
> Actual predicates via {{buildScan(requiredColumns: Seq\[Attribute\], filters: Seq\[Expression\])}} are as below:
> {code}
> println(filters.mkString("[", ", ", "]"))
> {code}
> {code}
> [(cast(a#0L as string) = 1), (a#0L < 3)]
> {code}



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