grundprinzip opened a new pull request, #42415:
URL: https://github.com/apache/spark/pull/42415
### What changes were proposed in this pull request?
To support cross-language session sharing in Spark connect, we need to be
able to inject the session ID into the connection string because on the server
side, the client-provided session ID is used already together with the user id.
```
SparkSession.builder.remote("sc://localhost/;session_id=abcdefg").getOrCreate()
```
### Why are the changes needed?
ease of use
### Does this PR introduce _any_ user-facing change?
Adds a way to configure the Spark Connect connection string with `session_id`
### How was this patch tested?
Added UT for the parameter.
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