dongjoon-hyun opened a new pull request, #54363:
URL: https://github.com/apache/spark/pull/54363

   ### What changes were proposed in this pull request?
   
   This PR aims to add `jdbc.py` example.
   
   ### Why are the changes needed?
   
   To provide a working example which can be used in the downstream as a test 
case.
   
   ### Does this PR introduce _any_ user-facing change?
   
   No.
   
   ### How was this patch tested?
   
   Manual tests.
   
   **1. Run MySQL**
   
   ```bash
   $ docker run -e POSTGRES_PASSWORD=rootpass -p 5432:5432 -d postgres:latest
   ```
   
   **2. Run this example**
   
   ```bash
   $ curl -LO 
https://repo1.maven.org/maven2/org/postgresql/postgresql/42.7.7/postgresql-42.7.7.jar
   
   $ bin/spark-submit --driver-class-path postgresql-42.7.7.jar --jars 
postgresql-42.7.7.jar -c spark.log.level=ERROR 
examples/src/main/python/sql/jdbc.py 
'jdbc:postgresql://127.0.0.1:5432/?user=postgres&password=rootpass'
   WARNING: Using incubator modules: jdk.incubator.vector
   26/02/17 22:55:04 WARN NativeCodeLoader: Unable to load native-hadoop 
library for your platform... using builtin-java classes where applicable
   Using Spark's default log4j profile: 
org/apache/spark/log4j2-defaults.properties
   26/02/17 22:55:05 INFO SparkContext: Running Spark version 4.1.1
   26/02/17 22:55:05 INFO SparkContext: OS info Mac OS X, 26.3, aarch64
   26/02/17 22:55:05 INFO SparkContext: Java version 17.0.18+8-LTS
   Setting Spark log level to "ERROR".
   +---+----+
   | id|name|
   +---+----+
   |  2| bar|
   |  1| foo|
   +---+----+
   ```
   
   ### Was this patch authored or co-authored using generative AI tooling?
   
   Generated-by: `Gemini 3 Pro (High)` on `Antigravity`


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