andygrove opened a new pull request, #5152:
URL: https://github.com/apache/datafusion-comet/pull/5152
## Which issue does this PR close?
Backport of #5049 to `branch-1.0`.
## Rationale for this change
There is currently no convenient way for a Spark user to query which Comet
version is loaded. The JVM `org.apache.comet.COMET_VERSION` constant exists but
is only reachable via Scala imports, and the native library logs the version on
init but that requires driver log access.
## What changes are included in this PR?
Clean cherry-pick of 3c830f4de (no conflicts):
- The Comet driver plugin sets `spark.comet.version` on the SparkConf during
`init`, so it is queryable at runtime via
`spark.conf.get("spark.comet.version")` or `SET spark.comet.version` in SQL. It
is set before the off-heap check so the version is reported even when Comet is
otherwise disabled.
- Documents both the new `spark.comet.version` runtime config and the
existing `org.apache.comet.COMET_VERSION` (plus `COMET_BRANCH` /
`COMET_REVISION`) programmatic accessors in the installation guide.
## How are these changes tested?
Existing test from the original PR: `CometPluginsSuite` (`Comet version is
exposed as a Spark config`).
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