[EPIC] More Subquery support #5483

Activity

1. alamb

   added

   enhancementNew feature or requestNew feature or request

   on Mar 5, 2023
2. Y-jiji commented on Mar 12, 2025

   

   Y-jiji

   on Mar 12, 2025

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   I want to try this for GSoC. Leave an email: tyang425@gatech.edu
3. yashdavkhar7020 commented on Mar 14, 2025

   

   yashdavkhar7020

   on Mar 14, 2025

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   🚀 Interested in Contributing to Correlated Subqueries in DataFusion

   Hi

   I am Yash Davkhar, and I am highly interested in contributing to this project on adding support for correlated subqueries in DataFusion. I have experience in SQL, database systems, and query optimization and would love to apply my skills to improve DataFusion’s SQL engine.

   I have gone through the project description and the linked epic, and I would appreciate any guidance on how to get started. Could you please share any specific tasks or areas I should focus on first?

   Looking forward to contributing! 🚀

   Best regards,
   Yash Davkhar
4. SanjayUG commented on Mar 19, 2025

   

   SanjayUG

   on Mar 19, 2025

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   Hi there,

   Looks interesting issue, I would love to contribute to it without any fiction.

   Thank You.
5. PhaniKulkarni commented on Mar 31, 2025

   

   PhaniKulkarni

   on Mar 31, 2025

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   Hi, I am interested in contributing to Apache DataFusion, specifically in implementing correlated subqueries support

   I have experience in SQL Engines, Data Migration and query optimization and have gone through DataFusion’s documentation and source code. However, I would appreciate some guidance on:

   1. Where to start in understanding DataFusion’s query planning and optimization workflow.

   2. Any specific resources or previous discussions that would be helpful.

   3. How best to break down the implementation steps before submitting a PR.

   A brief discussion would be greatly appreciated.

   Here is my contact and profile details:
   LinkedIn: https://www.linkedin.com/in/phani-kulkarni-140674180/
   Mail: kulkarniphani@gmail.com

   Thanks and Regards,
   Phani Kulkarni
6. alamb commented on Mar 31, 2025

   

   alamb

   on Mar 31, 2025

   ContributorAuthor

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   Where to start in understanding DataFusion’s query planning and optimization workflow.

   I think starting at https://datafusion.apache.org/ and https://datafusion.apache.org/contributor-guide/architecture.html would probably be a good place to start
7. alamb commented on Apr 28, 2025

   

   alamb

   on Apr 28, 2025

   ContributorAuthor

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   • I am trying to organize a join task force for planning joins / subqueries: [DISCUSSION] JOIN "task force" / project team #15885
8. alamb

   added

   EPICA larger project, actively underway, with sub tasksA larger project, actively underway, with sub tasks

   PROPOSAL EPICA proposal being discussed that is not yet fully underwayA proposal being discussed that is not yet fully underway

   and removed

   EPICA larger project, actively underway, with sub tasksA larger project, actively underway, with sub tasks

   on Aug 12, 2025
9. adriangb commented on Feb 1, 2026

   

   adriangb

   on Feb 1, 2026

   Contributor

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   Dropping an example that I was surprised didn't work, I think related to this:

   > CREATE TABLE t(col text) AS VALUES ('foo');
   0 row(s) fetched. 
   Elapsed 0.005 seconds.
   
   > SELECT EXISTS (
       SELECT 1 
       FROM t 
       WHERE col = 'value'
   ) AS exst;
   This feature is not implemented: Physical plan does not support logical expression Exists(Exists { subquery: <subquery>, negated: false })