[GitHub] [spark] imback82 opened a new pull request #26048: [SPARK-29373][SQL][WIP] DataSourceV2: Commands should not submit a spark job

[GitBox <gi...@apache.org>]

imback82 opened a new pull request #26048: [SPARK-29373][SQL][WIP] DataSourceV2: Commands should not submit a spark job
URL: https://github.com/apache/spark/pull/26048
 
 
   ### What changes were proposed in this pull request?
   DataSourceV2 Exec classes (ShowTablesExec, ShowNamespacesExec, etc.) all extend LeafExecNode. This results in running a job when executeCollect() is called. This breaks the previous behavior [SPARK-19650](https://issues.apache.org/jira/browse/SPARK-19650).
   
   A new command physical operator will be introduced form which all V2 Exec classes derive to avoid running a job.
   
   ### Why are the changes needed?
   <!--
   Please clarify why the changes are needed. For instance,
     1. If you propose a new API, clarify the use case for a new API.
     2. If you fix a bug, you can clarify why it is a bug.
   -->
   It is a bug since the current behavior runs a spark job, which breaks the existing behavior: [SPARK-19650](https://issues.apache.org/jira/browse/SPARK-19650).
   
   ### Does this PR introduce any user-facing change?
   <!--
   If yes, please clarify the previous behavior and the change this PR proposes - provide the console output, description and/or an example to show the behavior difference if possible.
   If no, write 'No'.
   -->
   No
   
   ### How was this patch tested?
   <!--
   If tests were added, say they were added here. Please make sure to add some test cases that check the changes thoroughly including negative and positive cases if possible.
   If it was tested in a way different from regular unit tests, please clarify how you tested step by step, ideally copy and paste-able, so that other reviewers can test and check, and descendants can verify in the future.
   If tests were not added, please describe why they were not added and/or why it was difficult to add.
   -->
   Existing unit tests.

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