zhengruifeng opened a new pull request, #57390: URL: https://github.com/apache/spark/pull/57390
### What changes were proposed in this pull request? Batch the creation of missing columns in pandas-on-Spark `concat` with `join="outer"` into one `withColumns` call. ### Why are the changes needed? The previous loop made one Python-to-JVM call and one projection per missing column. Batching independent literal-null expressions reduces driver overhead and avoids a deep projection chain for wide inputs without changing the result. ### Does this PR introduce _any_ user-facing change? No. ### How was this patch tested? - Ran `git diff --check`. - No runtime test was run. Existing namespace tests cover outer concatenation with differing columns. ### Was this patch authored or co-authored using generative AI tooling? Generated-by: Codex (GPT-5) -- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. To unsubscribe, e-mail: [email protected] For queries about this service, please contact Infrastructure at: [email protected] --------------------------------------------------------------------- To unsubscribe, e-mail: [email protected] For additional commands, e-mail: [email protected]
