[jira] [Resolved] (SPARK-59140) Close PySpark 4.2.0 public-API parity gaps in the Rust drop-in client

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

     [ https://issues.apache.org/jira/browse/SPARK-59140?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Hyukjin Kwon resolved SPARK-59140.
----------------------------------
    Fix Version/s: connect-rust-4.2.0
       Resolution: Fixed

Issue resolved by pull request 94
[https://github.com/apache/spark-connect-rust/pull/94]

> Close PySpark 4.2.0 public-API parity gaps in the Rust drop-in client
> ---------------------------------------------------------------------
>
>                 Key: SPARK-59140
>                 URL: https://issues.apache.org/jira/browse/SPARK-59140
>             Project: Spark
>          Issue Type: Improvement
>          Components: Connect
>    Affects Versions: 5.0.0
>            Reporter: Hyukjin Kwon
>            Priority: Major
>              Labels: pull-request-available
>             Fix For: connect-rust-4.2.0
>
>
> The Rust drop-in client (pyspark-client-rust) advertises "100% public-API parity with PySpark 4.2.0 / runs unchanged", but keyword-argument calls raised TypeError on ~507 SQL functions and dozens of DataFrame/Column/Catalog/Reader/Writer/Streaming/Session methods, and several parameters were missing entirely. So common PySpark code did not run unchanged.
> This issue tracks bringing the public API of pyspark.sql.connect.* to keyword-argument and signature parity with PySpark 4.2.0.
> Verified with an independent signature harness against the v4.2.0 tag:
> - function keyword-arg mismatches: 513 -> 0
> - class-method param mismatches: 70 -> 2 (both intentional: Column.alias/name expose an explicit metadata= where the reference uses **kwargs)
> Also verified: all Rust golden/core tests pass, and a focused end-to-end suite runs 16/16 green against a real Spark Connect 4.2.0 server.
> A few params are accepted for signature parity but not yet behaviorally wired pending connect-core/proto support (documented in-code and in PARITY_GAP_ANALYSIS.md): mapInPandas/mapInArrow(profile), localCheckpoint(storageLevel), printSchema(level), createDataFrame(verifySchema), trigger(realTime), multi-path read.parquet(*paths).



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